Deuterium Isotope Effect in the Photophysics of Chromium (III) Alkylamine Complexes
- 1 February 1986
- journal article
- research article
- Published by Wiley in Berichte der Bunsengesellschaft für physikalische Chemie
- Vol. 90 (2) , 111-114
- https://doi.org/10.1002/bbpc.19860900204
Abstract
The photophysical properties of a series of chromium alkylamines with CrN6 skeletons were studied in a mixture of dimethylsulfoxide (DMSO) and water (1:1 vv). For the analogous N‐deuterated compounds DMSO/D2O (1:1 vv) was used as the solvent Absorption spectra, phosphorescence quantum yields, and phosphorescence decay times were measured. At low temperatures the protonated complexes were found to decay mainly nonradiatively with NH stretching modes accepting the excitation energy. In the deuterated species the radiative decay became important. Phosphorescence quantum yields as high as 0.42 were obtained. ND stretching modes did not significantly contribute to the nonradiative deactivation in agreement with Kupka's theory. At higher temperatures (250–295 K) a smaller isotope effect was observed. The apparent activation energies of the high temperature decay increased on deuteration.Keywords
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