SPECTROPHOTOMETRIC STUDY OF THERMODYNAMICS AND KINETICS OF CHARGE-TRANSFER COMPLEXATION OF DIBENZOPYRIDINO-18-CROWN-6 WITH IODINE IN CHLOROFORM SOLUTION

The charge-transfer complexation reaction between iodine and dibenzopy ridino-18-crown-6 (DBPY18C6) has been investigated spectrophotometrica lly in chloroform solution at different temperatures. The resulting co mplex was formulated as (DB PY 18C6...I+)I-3(-). The enthalpy and entr opy of the comp lex form nti on were evaluated from the temperature de pendence of the formation constant. The resulting charge-transfer comp lex is both enthalpy and entropy stabilized. The rate constants at var ious temperatures and the activation parameters were evaluated.