Kinetic and mechanistic aspects of iron(II) coordination to bipyridyl-based hydrogel pofymer membranes

摘要: A range of hydrophilic membranes composed copolymers 4-methyl-4′-vinyl-2, 2′-bipyridyl with 2-hydroxyethyl methacrylate have been synthesized. These readily coordinate iron(II) from aqueous solution to form the tris(2,2′-bipyridyl)iron(II) species, but at a rate very much slower than that free ligand in solution. Kinetic studies on development these colour centres shown process be anion-dominated and pseudo-first order for sulfate second chloride perchlorate. The extent coordination within membrane is also dependent salt used, as anion influences concentration FeII partitioned gel matrix, ultimately position equilibrium established between mono tris complexes. Mechanisms are proposed incorporating known water-structuring effects anions impose this type hydrogel environment accounting presence ion pairs their effect molecular reorganisations necessary complexation occur.