Cooperativity and Binding Isotherms of the Amylose-Iodine-Triiodide Complex

摘要

A simple model has been presented which is based on some widely accepted characteristics of the amylose-iodine-triiodide complex and is capable of correlating a number of experimental features with molecular parameters. A substantial improvement is obtained removing weakness and arbitrariness of some adjustable parameters of previous models. The proposed model assumes that sequences of bound species are initiated by triiodide ions and propagated (principally) by iodine. The theory is developed by using the matrix method of Zimm and Bragg and assuming that the cooperative interaction is of electrostatic nature. The model reproduces most of the experimental data and predicts a finite length of the bound polyiodine chain for any length of the host polymer. (Atomindex citation 16:059984)