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

Details of the complex formed between pentacyanoferrate(II) and chitosan [4 PMCFe(CN)(5)](3-) are reported. The polymer was characterized by infrared a nd Mossbauer spectroscopy, and cyclic voltammetry. The infrared spectrum fo r [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 m V versus Ag/AgCl. The Mossbauer spectra for the polymer [4PMCFe(CN)(5)](3-) show a doublet with quadrupolar splitting (Delta) of the 0.60 mm s(-1) and isomer shift (delta) 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 g roup of chitosan. (C) 2000 Elsevier Science Ltd. All rights reserved.