FTIR Spectra of Hydrogen-Bonded Inclusion Compounds of Iodine

Abstract

The inclusion compounds of iodine such as α-cyclodextrin-KI-I2-4H2O, β-cyclodextrin-KI-I2-H2O, and amylose-iodine are hydrogen bonded with dyes such as Para red, Congo red, Direct red, Bismark brown, Trypan blue, and Evans blue. Hydrogen bonding of these with dyes containing O–H and N–H occurs in glucosidic oxygen atoms or O–H groups of the polysaccharides. Excitons are emitted and absorbed by the electrons along the iodine chains as revealed by the analysis, which reduces band gap along the polyiodide chains.