KINETIC STUDY OF CHARGE TRANSFER COMPLEXES OF IODINE WITH SOME CROWN ETHERS IN NONAQUEOUS SOLVENTS

charge-transfer complexation of iodine with 15-crown-5(15c5), dicyclohexyl-18-crown-6 (dc18c6), benzo-18-crown-6 (b18c6) and dibenzo-24-crown-8 (db24c8) has been studied in chloroform (chcl3), dichloromethane (dcm) and 1,2-dichloroethane (1,2-dce) solutions at different time. the results indicated immediate formation of an electron donor-electron acceptor complex; which is followed by two relatively slow consecutive reactions. the pseudo-first-order rate constants for the formation of the ionic intermediate and the final product have been evaluated at 25 °c. the rate of formation of product has been measured as a function of time in different halocarbone solvents. the pseudo first order rate constants were evaluated from the absorbance- time data and found to vary in the order of 1,2-dce >dcm >chcl3.