Interaction of some biomolecules with π- and σ-acceptors

Electrical conductance, refractometric and differential refractometric techniques have been used to study the charge-transfer interaction of some biomolecules with chloranil and iodine, and their ion-pair separation. A mechanism of transformation of outer complex to inner complex has been suggested. The coexistence of intimate and solvent-separated ion-pairs in equilibrium in binary mixtures of dioxan—THF is indicated for these complexes. The equilibrium constant (K) and solvation number (n) for the equilibria;AAI+, I 3 − +nTHF\(\mathop \rightleftharpoons \limits^K\)AAI+//I 3 − ;GBI+, I 3 − +nTHF\(\mathop \rightleftharpoons \limits^K\)AAI+//I 3 − ;GBI+//I 3 − , have been calculated and it was found that a singleTHF molecule has managed to intercalate between cation and anion.