Show Advanced Search


Containing Text
- - -
Filter by author or institution
Filter by publication date
October, 2006
Filter by journal section

Filter by science education

Chemistry: A basic science concerned with the composition, structure, and properties of matter; and the reactions that occur between substances and the associated energy exchange.

Elemental-Sensitive Detection of the Chemistry in Batteries Through Soft X-Ray Absorption Spectroscopy and Resonant Inelastic X-Ray Scattering

1Geballe Laboratory for Advanced Materials, Stanford University, 2Advanced Light Source, Lawrence Berkeley National Laboratory, 3Department of Materials Science and Engineering, Binghamton University, 4School of Physics, National Key Laboratory of Crystal Materials, Shandong University, 5School of Advanced Materials, Peking University Shenzhen Graduate School, 6School of Metallurgy, Northeastern University, 7Department of Chemical Engineering, University of California-Santa Barbara

Video Coming Soon

JoVE 57415

 JoVE In-Press

Coordination Chemistry Complexes

JoVE 10179

Source: Laboratory of Dr. Neal Abrams — SUNY College of Environmental Science and Forestry

Transition metals are found everywhere from vitamin supplements to electroplating baths. Transition metals also make up the pigments in many paints and compose all minerals. Typically, transition metals are found in the cationic form since they readily oxidize, or lose electrons, and are surrounded by electron donors called ligands. These ligands do not form ionic or covalent bonds with the metal center, rather they take on a third type of bond known as coordinate-covalent. The coordinate-covalent bond between a ligand and a metal is dynamic, meaning that ligands are continuously exchanging and re-coordinating around the metal center. The identities of both the metal and the ligand dictates which ligands will bond preferentially over another. In addition, color and magnetic properties are also due to the types of complexes that are formed. The coordination compounds that form are analyzed using a variety of instruments and tools. This experiment explores why so many complexes are possible and uses a spectrochemical (color and chemical) method to help identify the type of coordination complex that forms.

 General Chemistry

Making Conjugation-induced Fluorescent PEGylated Virus-like Particles by Dibromomaleimide-disulfide Chemistry

1Department of Chemistry & Biochemistry, University of Texas at Dallas, 2Undergraduate Biology, University of Texas at Dallas, 3Undergraduate Healthcare Studies, University of Texas at Dallas, 4Departments of Chemistry & Biochemistry and Biomedical Engineering, University of Texas at Dallas

Video Coming Soon

JoVE 57712

 JoVE In-Press

Site-Directed Immobilization of Bone Morphogenetic Protein 2 to Solid Surfaces by Click Chemistry

1Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik (IGB), Translationszentrum Würzburg 'Regenerative Therapien für Krebs- und Muskuloskelettale Erkrankung', Institutsteil Würzburg, 2Lehrstuhl für Tissue Engineering und Regenerative Medizin, Universitätsklinikum Würzburg, 3Lehrstuhl für Pharmazeutische Technologie und Biopharmazie, Universität Würzburg, 4Lehrstuhl für molekulare Pflanzenphysiologie und Biophysik, Julius-von-Sachs Institut für Biowissenschaften, Universität Würzburg

Video Coming Soon

JoVE 56616

 JoVE In-Press

Circulating MicroRNA Quantification Using DNA-binding Dye Chemistry and Droplet Digital PCR

1Department of Experimental, Diagnostic and Specialty Medicine - DIMES, University of Bologna, 2Department of Morphology, Surgery and Experimental Medicine, University of Ferrara, 3Department of Life Sciences and Biotechnology, University of Ferrara, 4Department of Morphology, Surgery and Experimental Medicine and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara

JoVE 54102


Quantitative Detection of Trace Explosive Vapors by Programmed Temperature Desorption Gas Chromatography-Electron Capture Detector

1Chemical Sensing & Fuel Technology, Chemistry Division, U.S. Naval Research Laboratory, 2NOVA Research, Inc., 3Bio/Analytical Chemistry, Chemistry Division, U.S. Naval Research Laboratory, 4Navy Technology Center for Safety and Survivability, Chemistry Division, U.S. Naval Research Laboratory

JoVE 51938


Molecular Orbital (MO) Theory

JoVE 10447

Source: Tamara M. Powers, Department of Chemistry, Texas A&M University

This protocol serves as a guide in the synthesis of two metal complexes featuring the ligand 1,1'-bis(diphenylphosphino)ferrocene (dppf): M(dppf)Cl2, where M = Ni or Pd. While both of these transition metal complexes are 4-coordinate, they exhibit different geometries at the metal center. Using molecular orbital (MO) theory in conjunction with 1H NMR and Evans method, we will determine the geometry of these two compounds.

 Inorganic Chemistry

Structure Of Ferrocene

JoVE 10347

Source: Tamara M. Powers, Department of Chemistry, Texas A&M University 

In 1951, Kealy and Pauson reported to Nature the synthesis of a new organometallic compound, ferrocene.1 In their original report, Pauson suggested a structure for ferrocene in which the iron is singly bonded (sigma bonds) to one carbon atom of each cyclopentadiene ligand (Figure 1, Structure I).1,2,3 This initial report led to wide-spread interest in the structure of ferrocene, and many leading scientists participated in the structure elucidation of this interesting new molecule. Wilkinson and Woodward were quick to suggest an alternative formulization where the iron is "sandwiched" between two cyclopentadiene ligands, with equal binding to all 10 carbon atoms (Figure 1, Structure II).4 Here, we will synthesize ferrocene and decide, based on experimental data (IR and 1H NMR), which of these structures is observed. In addition, we will study the electrochemistry of ferrocene by collecting a cyclic voltammogram. In the course of this experiment, we introduce the 18-electron rule and discuss valence electron counting for transitio

 Inorganic Chemistry

More Results...