INTERACTION OF 8-HYDROXYQUINOLINE WITH CADMIUM HALIDES IN SOLID-STATE

The solid state reactions of 8-hydroxyquinoline (8-HQ) and cadmium hal ides (CdX(2); X = Cl, Br, and I) have been studied. Each reaction foll ows the rate equation X(n) = kt. The activation energies calculated fr om the progress of the reaction studied by the lateral diffusion techn ique are 74.55 +/- 1.22, 84.65 +/- 3.88, and 101.66 +/- 0.93 kJ mole(- 1) for CdCl2-8-HQ CdBr2-8-HQ and CdI2-8-HQ reactions, respectively. 8- HQ diffuses into cadmium halide grains by a defect mechanism; penetrat ion to the grains is preceded by surface migration. The reactions were followed by chemical analysis, IR spectral studies, and thermal and c onductivity measurements. A single addition product, [CdX(2)-(8-HQ)], was obtained for CdCl2 and CdBr2, whereas CdI2 gave rise to two additi on products, CdI2-(8-HQ) and CdI2-(8-HQ)(2). (C) 1995 Academic Press, Inc.