Reduction of ferriprotoporphyrin IX to the ferroderivative by copoly(4‐vinylpyridine‐N‐(p‐vinylbenzyl)‐3‐carbamoyl‐1,4‐dihydropyridine) in dimethyl sulfoxide

Abstract

SynopsisThe copolymer which has both ligand sites (4-vinylpyridine) and redox sites ( N -(p-vinylbenzyl)-3-carbamoyl-1,4-dihydropyridine) was synthesized by the dithionite reduction of the copoly(4-vinylpyridine-N-(p-vinylbenzyl)-3-carbamoylpyridinium chloride) and the reduction of a central ferric-iron of ferriprotoporphyrin IX by the above-described copolymer was studied spectrophotometrically in dimethyl sulfoxide. The rate of the reduction by the copolymer was much faster than by N-benzyl-3-carbamoyl-1,4-dihydropyridine. This acceleration by the copolymer could be explained by the intramolecular reduction of ferriprotoporphyrin IX which was coordinated by the pyridine residue of the copolymer.