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Find video protocols related to scientific articles indexed in Pubmed.
Self-Assembly of Polyhedral Indium-Organic Nanocages.
Inorg Chem
PUBLISHED: 11-14-2014
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A synthetic strategy to construct discrete indium-organic polyhedra has been illustrated based on small three-membered windows from a 2,5-pyridinedicarboxylate (PDC) ligand with an angle of 120°. [Et2NH2]6[In6(PDC)12] (InOF-10) is a high-symmetry octahedron with eight three-membered windows, and [Et2NH2]18[In18(BPDC)6(PDC)30] (InOF-11) is a complex polyhedron derived from 3-edge-removed octahedra with an auxiliary biphenyl-3,3'-dicarboxylate (BPDC) ligand. Moreover, the sorption behavior of the latter is also well investigated.
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Cost-Effective Synthesis of Amine-Tethered Porous Materials for Carbon Capture.
ChemSusChem
PUBLISHED: 07-02-2014
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A truly cost-effective strategy for the synthesis of amine-tethered porous polymer networks (PPNs) has been developed. A network containing diethylenetriamine (PPN-125-DETA) exhibits a high working capacity comparable to current state-of-art technology (30?% monoethanolamine solutions), yet it requires only one third as much energy for regeneration. It has also been demonstrated to retain over 90?% capacity after 50 adsorption-desorption cycles of CO2 in a temperature-swing adsorption process. The results suggest that PPN-125-DETA is a very promising new material for carbon capture from flue gas streams.
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Mesoporous carbon originated from non-permanent porous MOFs for gas storage and CO2/CH4 separation.
Sci Rep
PUBLISHED: 05-20-2014
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Four nanoporous carbons prepared by direct carbonization of non-permanent highly porous MOF [Zn3(BTC)2 · (H2O)3]n without any additional carbon precursors. The carbonization temperature plays an important role in the pore structures of the resultant carbons. The Brunauer-Emmett-Teller (BET) surface areas of four carbon materials vary from 464 to 1671 m(2) g(-1) for different carbonization temperature. All the four carbon materials showed a mesoporous structure centered at ca. 3 nm, high surface area and good physicochemical stability. Hydrogen, methane and carbon dioxide sorption measurements indicated that the C1000 has good gas uptake capabilities. The excess H2 uptake at 77 K and 17.9 bar can reach 32.9 mg g(-1) and the total uptake is high to 45 mg g(-1). Meanwhile, at 95 bar, the total CH4 uptake can reach as high as 208 mg g(-1). Moreover the ideal adsorbed solution theory (IAST) prediction exhibited exceptionally high adsorption selectivity for CO2/CH4 in an equimolar mixture at 298 K and 1 bar (S(ads) = 27) which is significantly higher than that of some porous materials in the similar condition.
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Two-dimensional metal-organic framework with wide channels and responsive turn-on fluorescence for the chemical sensing of volatile organic compounds.
J. Am. Chem. Soc.
PUBLISHED: 05-13-2014
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We report a 2D layered metal-organic framework (MOF) with wide channels named NUS-1 and its activated analogue NUS-1a composed of Zn4O-like secondary building units and tetraphenylethene (TPE)-based ligand 4,4'-(2,2-diphenylethene-1,1-diyl)dibenzoic acid. Due to its special structure, NUS-1a exhibits unprecedented gas sorption behavior, glass-transition-like phase transition under cryogenic conditions, and responsive turn-on fluorescence to various volatile organic compounds. Our approach using angular ligand containing partially fixed TPE units paves a way toward highly porous MOFs with fluorescence turn-on response that will find wide applications in chemical sensing.
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Coexistence of cages and one-dimensional channels in a porous MOF with high H(2) and CH(4) uptakes.
Chem. Commun. (Camb.)
PUBLISHED: 01-10-2014
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A porous metal-organic framework with high surface area was designedly synthesized, in which polyhedral cages and one-dimensional channels coexist. It shows a total gravimetric H2 uptake of 11.35 wt% at 77 K and 90 bar and a total CH4 uptake of 305.07 cm(3) g(-1) at 298 K and 35 bar.
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Unusual pore structure and sorption behaviour in a hexanodal zinc-organic framework material.
Chem. Commun. (Camb.)
PUBLISHED: 01-06-2014
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A highly porous metal-organic framework structurally consists of three topological kinds of 3-connected 1,3,5-benzenetricarboxylate ligands, Zn2(COO)4, Zn3O(COO)6 and Zn4O(COO)6 SBUs, featuring a new 3,3,3,4,4,6-c hexanodal topology. Sorption behaviour in this complicated microporous MOF material has also been investigated.
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Open Pentameric Calixarene Nanocage.
Inorg Chem
PUBLISHED: 12-18-2013
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A novel open helmetlike coordination cage has been synthesized based on Co4-calixarene shuttlecock-like secondary building units and in situ generated phosphate anions, where the opening of the cage comprises a large 16-membered ring. The above unprecedented Co20 nanocage presents the first pentameric calixarene coordination compound. Sorption behavior and magnetic properties are also investigated.
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In situ construction of a coordination zirconocene tetrahedron.
Inorg Chem
PUBLISHED: 11-26-2013
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The current study describes the first in situ synthesis and characterization of a new family of cationic coordination tetrahedra of both the V4F4 and V4E6 type, which are constructed by a new building block based on a trinuclear zirconocene moiety and the dicarboxylate or tricarboxylate anions.
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Achieving a Rare Breathing Behavior in a Polycatenated 2?D to 3?D Net through a Pillar-Ligand Extension Strategy.
Chemistry
PUBLISHED: 11-04-2013
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Through a pillar-ligand extension strategy, a rare breathing behavior in polycatenated 2D?3D nets has been achieved. Three variants exhibit interesting sorption properties that range from non-breathing to breathing behaviors, which is influenced by the angles between the pillars and the single honeycomb layers. The increase in pillar length does not lead to an increase in polycatenation multiplicity, which is controlled by the length of intralayer tripodal carboxylate. It also does not induce obviously expanded interlayer separations but occupies much more the free voids, and as a consequence, a smaller pore volume is obtained. This suggests that in 2D?3D polycatenated bilayer metal-organic frameworks, the porosity is not always enhanced by increasing the length of the interlayer pillars with the intralayer linker remaining unchanged.
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Anion-driven self-assembly: from discrete cages to infinite polycatenanes step by step.
Chem. Commun. (Camb.)
PUBLISHED: 06-08-2013
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Induced by different anions, two different polycatenanes constructed from Ag(6)L(4) units with different conformations have been prepared. Intermediates Ag(6)L(4) and Ag(5)L(4) are observed to participate in interlocking, and the related possible self-assembly routes are also presented.
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Reversible alteration of CO2 adsorption upon photochemical or thermal treatment in a metal-organic framework.
J. Am. Chem. Soc.
PUBLISHED: 12-19-2011
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A metal-organic framework (MOF) for reversible alteration of guest molecule adsorption, here carbon dioxide, upon photochemical or thermal treatment has been discovered. An azobenzene functional group, which can switch its conformation upon light irradiation or heat treatment, has been introduced to the organic linker of a MOF. The resulting MOF adsorbs different amount of CO(2) after UV or heat treatment. This remarkable stimuli-responsive adsorption effect has been demonstrated through experiments.
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A porous metal-organic framework with helical chain building units exhibiting facile transition from micro- to meso-porosity.
Chem. Commun. (Camb.)
PUBLISHED: 12-02-2011
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A metal-organic framework (MOF) with helical channels has been constructed by bridging helical chain secondary building units with 2,6-di-p-carboxyphenyl-4,4-bipyridine ligands. The activated MOF shows permanent porosity and gas adsorption selectivity. Remarkably, the MOF exhibits a facile transition from micro- to meso-porosity.
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Sulfonate-grafted porous polymer networks for preferential CO2 adsorption at low pressure.
J. Am. Chem. Soc.
PUBLISHED: 10-24-2011
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A porous polymer network (PPN) grafted with sulfonic acid (PPN-6-SO(3)H) and its lithium salt (PPN-6-SO(3)Li) exhibit significant increases in isosteric heats of CO(2) adsorption and CO(2)-uptake capacities. IAST calculations using single-component-isotherm data and a 15/85 CO(2)/N(2) ratio at 295 K and 1 bar revealed that the sulfonate-grafted PPN-6 networks show exceptionally high adsorption selectivity for CO(2) over N(2) (155 and 414 for PPN-6-SO(3)H and PPN-6-SO(3)Li, respectively). Since these PPNs also possess ultrahigh physicochemical stability, practical applications in postcombustion capture of CO(2) lie well within the realm of possibility.
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Pressure-responsive curvature change of a "rigid" geodesic ligand in a (3,24)-connected mesoporous metal-organic framework.
Inorg Chem
PUBLISHED: 09-26-2011
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A (3,24)-connected mesoporous metal-organic framework, PCN-69, was synthesized by linking a hexatopic ligand btti with dicopper paddlewheel clusters. This material has rigid connectivity but a flexible framework, which has been attributed to a curvature change of the ligand.
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Surface functionalization of metal-organic polyhedron for homogeneous cyclopropanation catalysis.
Chem. Commun. (Camb.)
PUBLISHED: 03-22-2011
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A super-paddlewheel (comprised of two paddlewheels) metal-organic polyhedron (MOP) containing surface hydroxyl groups was synthesized and characterized. Condensation reactions with linear alkyl anhydrides lead to new MOPs with enhanced solubility. As a result, the surface-modified MOP 4 was demonstrated as a homogeneous Lewis-acid catalyst.
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Tuning the topology and functionality of metal-organic frameworks by ligand design.
Acc. Chem. Res.
PUBLISHED: 12-02-2010
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Metal-organic frameworks (MOFs)-highly crystalline hybrid materials that combine metal ions with rigid organic ligands-have emerged as an important class of porous materials. The organic ligands add flexibility and diversity to the chemical structures and functions of these materials. In this Account, we summarize our laboratorys experience in tuning the topology and functionality of MOFs by ligand design. These investigations have led to new materials with interesting properties. By using a ligand that can adopt different symmetry conformations through free internal bond rotation, we have obtained two MOFs that are supramolecular stereoisomers of each other at different reaction temperatures. In another case, where the dimerized ligands function as a D(3)-Piedfort unit spacer, we achieve chiral (10,3)-a networks. In the design of MOF-based materials for hydrogen and methane storage, we focused on increasing the gas affinity of frameworks by using ligands with different geometries to control the pore size and effectively introduce unsaturated metal centers (UMCs) into the framework. Framework interpenetration in PCN-6 (PCN stands for porous coordination network) can lead to higher hydrogen uptake. Because of the proper alignment of the UMCs, PCN-12 holds the record for uptake of hydrogen at 77 K/760 Torr. In the case of methane storage, PCN-14 with anthracene-derived ligand achieves breakthrough storage capacity, at a level 28% higher than the U.S. Department of Energy target. Selective gas adsorption requires a pore size comparable to that of the target gas molecules; therefore, we use bulky ligands and network interpenetration to reduce the pore size. In addition, with the help of an amphiphilic ligand, we were able to use temperature to continuously change pore size in a 2D layer MOF. Adding charge to an organic ligand can also stabilize frameworks. By ionizing the amine group within mesoMOF-1, the resulting electronic repulsion keeps the network from collapsing, giving rise to the first case of mesoporous MOF that demonstrates the type IV isotherm. We use dendritic hexacarboxylate ligands to synthesize an isoreticular series of MOFs with (3,24)-connected network topology. The cuboctahedral cages serve as building blocks that narrow the opening of the mesocavities into microwindows and stabilize these MOFs. The resulting materials have exceptionally high surface areas and hydrogen uptake capacities. Despite the many achievements in MOF development, there is still ample opportunity for further exploration. We will be continuing our efforts and look forward to contributing to this blossoming field in the next decade.
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Ligand bridging-angle-driven assembly of molecular architectures based on quadruply bonded Mo-Mo dimers.
J. Am. Chem. Soc.
PUBLISHED: 11-17-2010
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A systematic exploration of the assembly of Mo2(O2C-)4-based metal-organic molecular architectures structurally controlled by the bridging angles of rigid organic linkers has been performed. Twelve bridging dicarboxylate ligands were designed to be of different sizes with bridging angles of 0, 60, 90, and 120° while incorporating a variety of nonbridging functional groups, and these ligands were used as linkers. These dicarboxylate linkers assemble with quadruply bonded Mo-Mo clusters acting as nodes to give 13 molecular architectures, termed metal-organic polygons/polyhedra with metal cluster node arrangements of a linear shape, triangle, octahedron, and cuboctahedron/anti-cuboctahedron. The syntheses of these complexes have been optimized and their structures determined by single-crystal X-ray diffraction. The results have shown that the shape and size of the resulting molecular architecture can be controlled by tuning the bridging angle and size of the linker, respectively. Functionalization of the linker can adjust the solubility of the ensuing molecular assembly but has little or no effect on the geometry of the product. Preliminary gas adsorption, spectroscopic, and electrochemical properties of selected members were also studied. The present work is trying to enrich metal-containing supramolecular chemistry through the inclusion of well-characterized quadruply bonded Mo-Mo units into the structures, which can widen the prospect of additional electronic functionality, thereby leading to novel properties.
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Thermosensitive gating effect and selective gas adsorption in a porous coordination nanocage.
Chem. Commun. (Camb.)
PUBLISHED: 09-02-2010
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A porous coordination nanocage functionalized with 24 triisopropylsilyl groups exhibits a remarkable thermosensitive gate opening phenomenon and demonstrates a molecular sieving effect at a certain temperature range, which can be used for gas separation purposes.
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Control over interpenetration in lanthanide-organic frameworks: synthetic strategy and gas-adsorption properties.
Inorg Chem
PUBLISHED: 08-31-2010
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Two isostructural lanthanide-organic frameworks (1 and 2) with 2-fold interpenetrating nets have been synthesized based on 1,4-benzenedicarboxylic acid (H(2)BDC). By application of an organic ligand with hindrance groups and a terminal chelating ligand to replace BDC and coordinated solvates, interpenetration has been effectively controlled. The gas-sorption properties of the noninterpenetrating net have been studied.
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Introduction of cavities up to 4 nm into a hierarchically-assembled metal-organic framework using an angular, tetratopic ligand.
Chem. Commun. (Camb.)
PUBLISHED: 06-23-2010
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Cavities up to 4 nm have been introduced into a hierarchically-assembled metal-organic framework by adopting an angular, semi-flexible tetratopic ligand. The resulting MOF possesses permanent porosity and exhibits stepwise sorption isotherms for O(2) and N(2) gases.
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A NbO-type metal-organic framework derived from a polyyne-coupled di-isophthalate linker formed in situ.
Chem. Commun. (Camb.)
PUBLISHED: 05-06-2010
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A NbO-type metal-organic framework, PCN-46, was constructed based on a polyyne-coupled di-isophthalate linker formed in situ. Its lasting porosity was confirmed by N(2) adsorption isotherm, and its H(2), CH(4) and CO(2) adsorption capacity was examined at 77 K and 298 K over a wide pressure range (0-110 bar).
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An unusual case of symmetry-preserving isomerism.
Chem. Commun. (Camb.)
PUBLISHED: 01-11-2010
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Two isomeric phases of the NbO-type structure have been discovered: PCN-16 (alpha phase) and PCN-16 (beta phase), and gas sorption studies revealed that the alpha phase possesses a larger surface area, leading to higher hydrogen and methane storage capacity as compared with the beta phase.
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A large-surface-area boracite-network-topology porous MOF constructed from a conjugated ligand exhibiting a high hydrogen uptake capacity.
Inorg Chem
PUBLISHED: 07-18-2009
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A new porous metal-organic framework, PCN-20 with a twisted boracite net topology, was constructed based on a highly conjugated planar tricarboxylate ligand; PCN-20 possesses a large Langmuir surface area of over 4200 m(2)/g as well as demonstrates a high hydrogen uptake capacity of 6.2 wt % at 77 K and 50 bar.
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Stabilization of metal-organic frameworks with high surface areas by the incorporation of mesocavities with microwindows.
J. Am. Chem. Soc.
PUBLISHED: 06-18-2009
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Reactions between two novel hexatopic carboxylate ligands and copper salts give rise to two isostructural metal-organic frameworks (MOFs) with a (3,24)-connected network topology containing both micro- and mesocavities with sizes of up to 3 nm. Both frameworks retain their porosity after guest-molecule removal, leading to high surface areas. Constructing MOFs containing mesocavities with microwindows may serve as a general approach toward stable MOFs with high surface areas.
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A nanotubular metal-organic framework with permanent porosity: structure analysis and gas sorption studies.
Chem. Commun. (Camb.)
PUBLISHED: 06-09-2009
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A nanotubular metal-organic framework, PCN-19, was constructed based on a micro3-oxo-trinickel basic carboxylate secondary building unit (SBU) and the 9,10-anthracenedicarboxylate ligand; its permanent porosity was confirmed by N2 adsorption isotherms, and its H2 storage performances were evaluated under both low and high pressures at 77 K.
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Investigation of gas adsorption performances and H2 affinities of porous metal-organic frameworks with different entatic metal centers.
Inorg Chem
PUBLISHED: 05-22-2009
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Three isomorphous porous metal-organic frameworks (MOFs; PCN-9 (Co/Fe/Mn)) with entatic metal centers have been constructed on the basis of the trigonal planar H(3)TATB ligand and a novel square-planar secondary building unit. N(2) adsorption isotherms at 77 K confirmed the permanent porosities of the three porous MOFs. Variable-temperature adsorption measurements of H(2) revealed that the H(2) affinities of the three porous MOFs are related to the nature of entatic metal centers, which reversely affect their H(2) uptake capacities.
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Porous metal-organic frameworks based on an anthracene derivative: syntheses, structure analysis, and hydrogen sorption studies.
Inorg Chem
PUBLISHED: 04-25-2009
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Solvothermal assembly of 5,5-(9,10-anthracenediyl)di-isophthalate (H(4)adip) with in situ-generated dicopper and diiron paddlewheel secondary building units (SBUs) afforded two porous metal-organic frameworks (MOFs), designated as PCN-14 and PCN-15, respectively. The two MOFs crystallize in different structures, characterized by a difference in the dihedral angles between the anthracene and the phenyl rings of the adip ligand. PCN-14 retains permanent porosity under dehydration and contains nanoscopic cages while PCN-15 contains only one-dimensional hexagonal channels along the (0 0 1) direction which require solvent stabilization. The aromaticity of the anthracene rings of the adip ligand in conjunction with the nanoscopic cages grants PCN-14 high excess hydrogen adsorption capacity of 2.70 wt % at 77 K, 760 Torr (4.42 wt % at saturation), as well as high hydrogen affinity of 8.6 kJ/mol at low H(2) coverage. These values are compared to other tetracarboxylate-derived MOFs to better understand the role of the aromatic rings in hydrogen adsorption.
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A three-dimensional porous metal-organic framework constructed from two-dimensional sheets via interdigitation exhibiting dynamic features.
Inorg Chem
PUBLISHED: 04-25-2009
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A three-dimensional porous metal-organic framework (PCN-18) was constructed through interdigitating two-dimensional grid sheets composed of 4,4-(anthracene-9,10-diyl)dibenzoate and copper paddlewheel secondary building units, and its dynamic features were evidenced by gas sorption isotherms.
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Preparation and gas adsorption studies of three mesh-adjustable molecular sieves with a common structure.
J. Am. Chem. Soc.
PUBLISHED: 04-22-2009
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Solvothermal reactions of a predesigned amphiphilic ligand, 4-tert-butyl-biphenyl-3,5-dicarboxylate (BBPDC), with Zn(NO(3))(2), Co(NO(3))(2), and Cu(NO(3))(2) gave rise to three isostructural mesh-adjustable molecular sieves (MAMSs), MAMS-2, MAMS-3, and MAMS-4, respectively. The three new MAMSs all exhibit temperature-tuned molecular sieving effect. There exists a linear relationship between mesh size and temperature, D = D(0) + alphaT (D, mesh size at temperature T K; D(0), mesh size at 0 K; and alpha, constant). Constants D(0) and alpha are characteristics of a ligand in a certain structure, independent of the choice of metal. As a result, all of the three MAMSs based on the BBPDC ligand have a D(0) of 2.83 and an alpha of 0.0073.
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Microporous lanthanide metal-organic frameworks containing coordinatively linked interpenetration: syntheses, gas adsorption studies, thermal stability analysis, and photoluminescence investigation.
Inorg Chem
PUBLISHED: 02-25-2009
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Under solvothermal conditions, the reactions of trigonal-planar ligand, TATB (4,4,4-s-triazine-2,4,6-triyl-tribenzoate) with Dy(NO(3))(3), Er(NO(3))(3), Y(NO(3))(3), Yb(NO(3))(3), gave rise to four microporous lanthanide metal-organic frameworks (MOFs), designated as PCN-17 (Dy), PCN-17 (Er), PCN-17 (Y), and PCN-17 (Yb), respectively. The four porous MOFs are isostructural, with their crystal unit parameters shrinking in the order of PCN-17 (Dy), PCN-17 (Y), PCN-17 (Er), and PCN-17 (Yb), which also reflects the lanthanides contraction trend. All of them adopt the novel square-planar Ln(4)(mu(4)-H(2)O) cluster as the secondary building unit and contain coordinatively linked doubly interpenetrated (8,3)-connected nets. In addition to exhibiting interesting photoluminescence phenomena, the coordinatively linked interpenetration restricts the pore sizes and affords them selective adsorption of H(2) and O(2) over N(2) and CO, as well as renders them with high thermal stability of 500-550 degrees C as demonstrated from TGA profiles.
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In situ synthesis of Ag nanoparticles in aminocalix[4]arene multilayers.
J Colloid Interface Sci
PUBLISHED: 02-04-2009
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The layer-by-layer (LbL) assembled thin films containing tetraamino-thiacalix[4]arenes (1) and tetraamino-calix[4]arenes (2) were used as nanoreactor to synthesize in situ Ag nanoparticles (Ag NPs). UV-vis spectra and AFM images demonstrate that Ag NPs are included in the (1/Ag NPs)(n) and (2/Ag NPs)(n) multilayer films. The silver ions are absorbed through cation-pi interaction and calix[4]arene-metal ion coordination interaction and are reduced into Ag NPs by calix[4]arenes. TEM images indicated that Ag NPs within aminocalix[4]arene multilayers were highly dispersed and uniform. Moreover, the mean size of Ag NPs is smaller than 10 nm.
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Highly potent bactericidal activity of porous metal-organic frameworks.
Adv Healthc Mater
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Recent outbreaks of bacterial infection leading to human fatalities have been a motivational force for us to develop antibacterial agents with high potency and long-term stability. A novel cobalt (Co) based metal-organic framework (MOF) was tested and shown to be highly effective at inactivating model microorganisms. Gram-negative bacteria, Escherichia coli (strains DH5alpha and XL1-Blue) were selected to determine the antibacterial activities of the Co MOF. In this MOF, the Co serves as a central element and an octa-topic carboxylate ligand, tetrakis [(3,5-dicarboxyphenyl)-oxamethyl] methane (TDM(8-) ) serves as a bridging linker. X-ray crystallographic studies indicate that Co-TDM crystallizes in tetragonal space group P$overline 4$2(1) m with a porous 3D framework. The potency of the Co-TDM disinfectant was evaluated using a minimal bactericidal concentration (MBC) benchmark and was determined to be 10-15 ppm within a short incubation time period (<60 min). Compared with previous work using silver nanoparticles and silver-modified TiO(2) nano- composites over the same time period, the MBC and effectiveness of Co-TDM are superior. Electron microscopy images indicate that the Co-TDM displayed distinctive grain boundaries and well-developed reticulates. The Co active sites rapidly catalyzed the lipid peroxidation, causing rupture of the bacterial membrane followed by inactivation, with 100% recycling and high persistence (>4 weeks). This MOF-based approach may lead to a new paradigm for MOF applications in diverse biological fields due to their inherent porous structure, tunable surface functional groups, and adjustable metal coordination environments.
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Highly porous metal-organic framework sustained with 12-connected nanoscopic octahedra.
Dalton Trans
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Two dicopper(II)-paddlewheel-based metal-organic frameworks (PCN-81 and -82) have been synthesized by using tetratopic ligands featuring 90°-carbazole-dicarboxylate moieties. Both adopt 12-connected tfb topology with nanoscopic octahedra as building units. The freeze-dried PCN-82 shows Brunauer-Emmett-Teller (BET) and Langmuir surface areas as high as 4488 and 4859 m(2) g(-1), respectively. It also exhibits high H(2)-adsorption capacity at low pressure (300 cm(3) g(-1) or 2.6 wt% at 77 K and 1 bar), which can be attributed to its high surface area, microporosity, and open metal sites.
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A series of goblet-like heterometallic pentanuclear [Ln(III)Cu(II)4] clusters featuring ferromagnetic coupling and single-molecule magnet behavior.
Chem. Commun. (Camb.)
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A series of fascinating goblet-like clusters based on [Ln(III)Cu(II)(4)] cores have been assembled from a flexible carboxylate ligand, which exhibit a dominant ferromagnetic exchange coupling and single-molecule magnet behavior.
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Comparison of the effect of functional groups on gas-uptake capacities by fixing the volumes of cages A and B and modifying the inner wall of cage C in rht-type MOFs.
Inorg Chem
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Three porous (3,24)-connected rht-type metal-organic frameworks (MOFs), [Cu(3)L(H(2)O)(3)]·xsolvents (H(6)L(OH) = 4,4,4"-(hydroxysilanetriyl)tris(triphenyl-3,5-dicarboxylic acid), SDU-6; H(6)L(Me) = 4,4,4"-(methylsilanetriyl)tris(triphenyl-3,5-dicarboxylic acid), SDU-7; H(6)L(iBu) = 4,4,4"-(isobutylsilanetriyl)tris(triphenyl-3,5-dicarboxylic acid), SDU-8), have been successfully prepared from [Cu(2)(COO)(4)] paddlewheel SBUs (secondary building units) and C(3)-symmetric Si-based hexatopic carboxylatelinkers. All porous MOFs are constructed from 3D packing of nanosized cuboctahedral, truncated tetrahedral, and truncated octahedral cages. SDU-6-8 differ only in the functionality of the central Si atom of the hexacarboxylate ligands with hydroxyl, methyl, and isobutyl groups, respectively. Gas adsorption measurements of activated MOFs suggested that decoration of the cage walls with strong polar groups can enhance the adsorption capacities for N(2), H(2), and CH(4). SDU-6 with -OH as the functional group possesses high CH(4) uptake (172 cm(3) cm(-3) at 35 bar), which is very close to DOE target of 180 cm(3) cm(-3).
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Highly selective carbon dioxide adsorption in a water-stable indium-organic framework material.
Chem. Commun. (Camb.)
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A metal-organic framework, with chiral 4(1) In(OH)(CO(2))(2) helix chains, exhibits a high CO(2) uptake under ambient conditions and outstanding selective separations of CO(2) from CH(4) or N(2). Its high stability toward humidity or even boiling water is confirmed by PXRD method.
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Hexagonal prismatic dodecameric water cluster: a building unit of the five-fold interpenetrating six-connected supramolecular network.
Chem. Commun. (Camb.)
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An experimental (H(2)O)(n) (n > 10) aggregate, similar to a theoretical hexagonal prismatic dodecameric water cluster structure, is characterized, the water cluster can be reversibly generated. The hydrogen bonds between the water clusters and bis(imidazolyl) ligand result in the formation of a five-fold interpenetrating six-connected supramolecular network.
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Heterometallic thiacalix[4]arene-supported Na2Ni(II)12Ln(III)2 clusters with vertex-fused tricubane cores (Ln = Dy and Tb).
Chem. Commun. (Camb.)
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Two heterometallic thiacalix[4]arene-supported complexes possess a trinary-cubane core composed of one [Ni(2)Ln(2)] cubane unit and two [NaNi(2)Ln] cubane units sharing one Ln(III) ion (Ln = Dy and Tb). Only the Dy(III) complex exhibits slow magnetic relaxation behaviour of single molecule magnet nature.
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A series of octanuclear-nickel(II) complexes supported by thiacalix[4]arenes.
Inorg Chem
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A series of discrete complexes, [Ni(8)(BTC4A)(2)(?(6)-CO(3))(2)(?-CH(3)COO)(4)(dma)(4)]·H(2)O (1), [Ni(8)(BTC4A)(2)(?(6)-CO(3))(2)(?-Cl)(2)(?-HCOO)(2)(dma)(4)]·2DMF·2CH(3)CN (2), [Ni(8)(PTC4A)(2) (?(6)-CO(3))(2)(?-CH(3)COO)(4)(dma)(4)]·DMF (3), and [Ni(8)(PTC4A)(2)(?(6)-CO(3))(2)(?-OH)(?-HCOO)(3) (dma)(4)] (4) (p-tert-butylthiacalix[4]arene = H(4)BTC4A, p-phenylthiacalix[4]arene = H(4)PTC4A, dma = dimethylamine, and DMF = N,N-dimethylformamide), have been prepared under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction analyses, powder XRD, and IR spectroscopy. These four complexes are stacked by dumbbell-like building blocks with one chairlike octanuclear-nickel(II) core, which is capped by two thiacalix[4]arene molecules and connected by two in situ generated carbonato anions and different auxiliary anions. This work implied that not only the solvent molecules but also the upper-rim groups of thiacalix[4]arenes have significant effects on the self-assembly of the dumbbell-like building blocks. The magnetic properties of complexes 1-4 were examined, indicating strong antiferromagnetic interactions between the nickel(II) ions in the temperature range of 50-300 K.
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Stepwise adsorption in a mesoporous metal-organic framework: experimental and computational analysis.
Chem. Commun. (Camb.)
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Stepwise adsorption in a metal-organic framework with both micro- and meso-pores is caused by adsorbates first filling the micropores, then adsorbing along the mesopore walls, and finally filling the mesopores.
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Butterfly-like enantiomerically homochiral {Co(II)6Co(III)4} clusters exhibiting both slow magnetic relaxation and ferroelectric property.
Dalton Trans
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A pair of enantiomerically homochiral {Co(II)6Co(III)4} clusters featuring a butterfly-like structure, [Co(II)6Co(III)4(?3-OH)(?3-X)(S-pa)4(pdm)6(pdmH)2](ClO4)4·3.5H2O () and [Co(II)6Co(III)4(?3-OH)(?3-X)(R-pa)4(pdm)6(pdmH)2](ClO4)4·3.5H2O () (X = OH or OMe, S- or R-paH = S- or R-phenylalaninol and pdmH2 = pyridine-2,6-diyldimethanol), have been synthesized and structurally characterized. They are the second largest homochiral Co clusters constructed by chiral ligands. They are also the first example of high-nuclearity homochiral Co clusters having both slow magnetic relaxation behaviour and ferroelectric property.
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Polymeric double-anion templated Er48 nanotubes.
Chem. Commun. (Camb.)
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A polymeric tube-like Er48 complex has been synthesized and structurally characterized, in which two types of anions, i.e. Cl(-) and NO3(-), template the formation of Er18 wheels and Er12 rings through hydrogen bonding, respectively.
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What is Visualize?

JoVE Visualize is a tool created to match the last 5 years of PubMed publications to methods in JoVE's video library.

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We use abstracts found on PubMed and match them to JoVE videos to create a list of 10 to 30 related methods videos.

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In developing our video relationships, we compare around 5 million PubMed articles to our library of over 4,500 methods videos. In some cases the language used in the PubMed abstracts makes matching that content to a JoVE video difficult. In other cases, there happens not to be any content in our video library that is relevant to the topic of a given abstract. In these cases, our algorithms are trying their best to display videos with relevant content, which can sometimes result in matched videos with only a slight relation.