Aryl Diazonium Salts: New Coupling Agents in Polymer and

Diazonium compounds are hired as a brand new category of coupling brokers to hyperlink polymers, biomacromolecules, and different species (e. g. steel nanoparticles) to the skin of fabrics. The ensuing excessive functionality fabrics convey superior chemical and actual houses and locate common purposes. the good thing about aryl diazonium salts in comparison to different floor modifiers lies of their ease of guidance, speedy (electro)reduction, good selection of reactive practical teams, and powerful aryl-surface covalent bonding.

This specific booklet summarizes the present wisdom of the outside and interface chemistry of aryl diazonium salts. It covers basic facets of diazonium chemistry including theoretical calculations of surface-molecule bonding, analytical equipment used for the characterization of aryl layers, in addition to vital functions within the box of electrochemistry, nanotechnology, biosensors, polymer coatings and fabrics technological know-how. additionally, details on different floor modifiers (amines, silanes, hydrazines, iodonium salts) is incorporated. This number of 14 self-contained chapters constitutes a useful ebook for PhD scholars, teachers and commercial researchers engaged on this sizzling subject.

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9 nm, indicating a protective effect of the hydrazone group to the attack of aryl radicals. In addition, the hydrazone group is easily cleaved in an acidic medium to give a benzaldehyde monolayer (Carbon–C6H4–CHO, Γsurf = 4 × 10−10 mol cm−2) [260]. Steric effects can be used to limit the growth of the layer. Using 3,5-bis-tert-butyl benzenediazonium (with two bulky tert-butyl groups) it was possible to obtain a monolayer that was characterized by IR and ellipsometry (d = 1 nm on gold) [261]. The tert-butyl groups prevent a further attack on the grafted group by an aryl radical.

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There may also be spatial inhibition of the conformational changes that accompany the reduction [37]. 4 Swelling of the Layer The structure of multilayers films also depends on the solvent [256, 257, 274, 275]. For example, the contact angle of a polycarboxyphenylene layer changes from ∼25° after ultrasonication in water to ∼65° after ultrasonication in petroleum ether. In water the carboxyl groups are exposed to the solvent, maximizing the hydrophilicity of the layer, while in petroleum ether a rearrangement of the film takes place with the aryl rings preferentially exposed, maximizing the hydrophobicity of the surface [274].

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