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Journal of the Chilean Chemical Society

versión On-line ISSN 0717-9707

Resumen

ALIZADEH, NINA  y  ROOMIANI, AREF. KINETIC STUDY OF CHARGE TRANSFER COMPLEXES OF IODINE WITH SOME CROWN ETHERS IN NONAQUEOUS SOLVENTS. J. Chil. Chem. Soc. [online]. 2012, vol.57, n.2, pp. 1130-1133. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072012000200016.

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.

Palabras clave : Iodine; Charge transfer complex; Spectrophotometry; Kinetic; Crown ether.

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