Thiol-ligand Grafting
Thiol-ligand Grafting - Related Videos
02:33
Preparation and Reactions of Thiols
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2023
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol. This reaction fails because the thiol product can undergo a second nucleophilic substitution reaction in the presence of an excess alkyl halide to generate a sulfide as a by-product. This limitation can be overcome by using thiourea as the nucleophile. The reaction first produces an alkyl...
02:40
Ligand Binding Sites
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2020
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands. Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
02:51
Metal-Ligand Bonds
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2020
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes. In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
00:49
Ligand Binding and Linkage
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2020
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
08:09
A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
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2014
A simple, robust and scalable technique to functionalize and self-assemble macroscopic nanoparticle-ligand monolayer films onto template-free substrates is described in this protocol.
FAQs
Sulfur provides the anchoring site that connects a thiol-containing molecule to a compatible solid surface. On materials such as gold, this strong sulfur affinity promotes metal–sulfur bond formation, allowing the attached molecules to accumulate as an adsorbed ligand layer. The resulting organization places the ligand’s other chemical groups at the interface, where they can influence subsequent interactions.
The terminal group is the outward-facing part of the ligand after sulfur anchors it to the surface. Changing this group changes how the modified material interacts with its surroundings, including its surface charge, solubility, stability, and ability to recognize particular molecules. Consequently, ligand selection connects molecular structure with the behavior and intended function of the functionalized interface.
It controls reactivity by replacing an otherwise unmodified interface with a layer whose exposed chemical groups are deliberately selected. Those groups can alter interactions at the surface and regulate how molecules approach or bind there. In chemistry, this makes it possible to design interfaces with controlled reactivity rather than relying only on the inherent properties of the underlying metal or nanoparticle.
Selection should match the desired surface behavior with the ligand’s chemical features. The sulfur-containing portion must provide attachment to a suitable surface, while the terminal group should support the intended charge, solubility, stability, molecular-recognition, or reactivity properties. The choice of solid material also matters because the method depends on strong sulfur affinity for particular surfaces, including gold.
A typical workflow begins by choosing a compatible solid, such as a metal or nanoparticle, and a thiol-containing ligand with the desired terminal functionality. Contact between them allows sulfur to associate strongly with the surface and form metal–sulfur bonds. The attached molecules then create a ligand layer whose exposed chemistry determines the modified material’s subsequent interactions.
The method supports several interface-design applications. Researchers can modify nanoparticles, create sensing surfaces, attach biomolecules, and tune materials used in catalysis. In each case, the ligand layer provides chemical control at the solid boundary: it can influence recognition, stability, solubility, surface charge, or reactivity. This makes the approach useful when a material’s native surface does not provide the required function.