Solid-state photochemical and energy-transfer processes in some hexa-arnminechromium(III) salts

Abstract

Irradiation of Cr(NH₃)₆ZnCl₄,X (X = NO₃^– and Cl^–) and Cr(NH₃)₆X₃(X = NO₃^–, Cl^–, Br^–, and I^–) at 366, 404, and 436 nm resulted in their partial conversion into the penta-ammine species Cr(NH₃)₅X³⁺. Rise-time and decay-curve measurements indicate that efficient non-radiative energy transfer from the hexa-ammine to the penta-ammine ion occurs.