STRUCTURE AND DYNAMICS OF THE IODINE COLUMN IN THE POLYIODINE CANAL COMPLEX: (BENZOPHENONE)₉(Kl)₂I₇CHCl₃.

(Benzophenone)//9(KI)//2I//7CHCl//3 belongs to a group of polyiodine complexes between iodine and benzophenone which exhibits the unusual property of a large frequency dependent conductivity, thus, indicating a major contribution due to ionic conductivity. Resonance Raman spectroscopy is used to investigate the structure and dynamics of the iodine column. It is found that the potassium complex contains two types of iodine species: I//3** minus and I//3** minus /I//2 complex. A temperature dependence study reveals no phase transition below room temperature, however considerable anharmonicity as well as structural disorder exist in the iodine column. Substitution of cations from K** plus to NH//4** minus and Na** plus has small effect on the iodine interactions. However, replacing K** plus with Li** plus has a profound effect on the iodine column which now shows the presence of I//5** minus species in a relatively ordered structure. Although the substitution of the solvent molecule does not influence the nature of the iodine species, it does appear to affect the degree of disorder in the diodine column of the potassium complex.