Coupling Agent
Coupling Agent - Related Videos
09:35
Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents
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Cited by 13 •
2012
Biosensors interface with complex, biological environments and perform targeted detection by combining highly sensitive sensors with highly specific probes attached to the sensor via surface modification. Here, we demonstrate the surface functionalization of silica optical sensors with biotin using silane coupling agents to bridge the sensor and the biological environment.
07:20
Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Cited by 1 •
2014
This protocol describes the use of amide coupling reactions of isonicotinic acid and diaminoalkanes to form bridging ligands suitable for use in the synthesis of multinuclear platinum complexes, which combine aspects of the anticancer drugs BBR3464 and picoplatin.
11:27
Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
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Cited by 5 •
2016
This protocol describes the preparation and characterization of a dendrimeric magnetic resonance imaging (MRI) contrast agent that carries cyclen-based macrocyclic chelates coordinating paramagnetic gadolinium ions. In a series of MRI experiments in vitro, this agent produced an amplified MRI signal when compared to the commercially available monomeric analogue.
06:34
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Cited by 2 •
2020
Here, we demonstrate a simple and low-cost solution-casting process to improve the compatibility between the filler and the matrix of polymer-based nanocomposites using surface modified BaTiO3 fillers, which can effectively enhance the energy density of the composites.
10:19
Reducing Agents
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2023
Source: Vy M. Dong and Daniel Kim, Department of Chemistry, University of California, Irvine, CA Controlling the reactivity and selectivity during the synthesis of a molecule is very important criteria for chemists. This has led to the development of many reagents that allow chemists to pick and choose reagents suitable for a given task. Quite often, a balance between reactivity and selectivity needs to be achieved. This experiment will use IR spectroscopy to monitor the reaction and to...
FAQs
In peptide synthesis, the reagent first activates a carboxylic acid, converting it into a more reactive species. This activation allows an amine to attack and form the desired amide bond more readily than the unactivated acid would permit. The mechanism therefore links reagent choice to reaction rate, bond-forming efficiency, and the practical construction of peptide chains.
Peptide coupling agents commonly promote amide formation by activating a carboxylic acid for reaction with an amine. In cross-coupling chemistry, related reagents support the joining of carbon fragments under catalytic conditions. Both applications create new molecular connections, but they involve different reacting partners and reaction environments, so their roles should not be treated as interchangeable.
Selection influences how efficiently the intended bond forms, how selectively the partners react, and how many unwanted byproducts appear. A suitable reagent can also support milder synthetic conditions, which may make the procedure more practical. These effects matter when chemists construct complex molecules, because poor compatibility or low selectivity can complicate purification and reduce the useful product obtained.
The relevant features include the functional group requiring activation, the identity of the molecular partner that will attack, and whether the transformation belongs to peptide synthesis or catalytic carbon-fragment coupling. Chemists also weigh reaction efficiency, selectivity, byproduct formation, and the possibility of using milder conditions. Together, these considerations connect reagent choice with the intended synthetic outcome.
A conceptual workflow begins by identifying the two molecular partners and the bond they must form. For amide synthesis, the carboxylic acid is activated before the amine attacks and creates the new bond. For cross-coupling, the partners react under catalytic conditions. The selected reagent and conditions are then judged by efficiency, selectivity, and unwanted byproducts.
Their applications extend across peptide construction, pharmaceutical synthesis, polymer preparation, and the assembly of other complex molecules. In each setting, the central value is controlled formation of a new bond between selected partners. Coupling agents are especially useful when direct reaction would be slow or ineffective, helping make synthetic procedures more efficient and practically manageable.
A successful coupling reaction can connect molecular building blocks into larger or more structurally complex products. Depending on the chemistry, the result may be an amide-containing peptide, a pharmaceutical intermediate or product, or a polymer-related structure. Reaction efficiency and selectivity influence how effectively the desired architecture is obtained and how much unwanted material accompanies it.
They illustrate how chemists control reactivity rather than relying only on the inherent behavior of functional groups. By activating a less reactive partner or supporting catalytic joining of carbon fragments, these reagents expand the types of molecular structures that can be assembled. Their use connects reaction mechanism with practical goals such as selectivity, milder procedures, and complex-molecule construction.