Preparation and characterization of the pentacyanoferrate(II) on the surface of N-(4-pyridilmethylidene)chitosan

Abstract

Details of the complex formed between pentacyanoferrate(II) and chitosan [4PMCFe(CN) 5] 3− are reported. The polymer was characterized by infrared and Mössbauer spectroscopy, and cyclic voltammetry. The infrared spectrum for [4PMCFe(CN) 5] 3− contains a very strong band at 2041 cm −1 due to the CN stretch of the cyanide group. The cyclic voltammogram of [4PMCFe(CN) 5] 3− shows that the half-wave potential for the couple Fe II/III is 250 mV versus Ag/AgCl. The Mössbauer spectra for the polymer [4PMCFe(CN) 5] 3− show a doublet with quadrupolar splitting ( Δ) of the 0.60 mm s −1 and isomer shift ( δ) of the 0.11 mm s −1. The difference in parameters in comparison with the free complex can be attributed to the matrix effect, i.e. the interaction of the cyanide group of the complex with the hydroxyl group of chitosan.