Solvent motion and excited state decay in solutions of Cr(III) complexes

摘要

Thermal quenching of ~2E in Cr(bpy)_3~(3+) (bpy = 2,2'-bipyridine) solutions where back-intersystem crossing is not important is compared with the quenching of Cr(NCS)_6~(3-) and trans-Cr(NH_3)_2(NCS)_4~- in several solvents. Solvent motion enhances excited state relaxation whether or not back-intersystem crossing is a significant relaxation pathway. The relationship between moitionally induced decay and the exponential or nonexponential character of the decay is discussed.