Inorganic photophysics in solution. Part 6.—Isotope effects in the non-radiative deactivation of photo-excited uranyl [UO2]2+ ion in hydroxylic solvents
- 1 January 1980
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 76, 804-811
- https://doi.org/10.1039/f19807600804
Abstract
The effect of deuterium substitution on τ(UO2+ 2)* has been measured in H2O, mildly acidic H2O, strong aqueous LiCl and liquid methanol, in most cases over an extended temperature range (77 K to the boiling point). In all media, a strongly temperature-activated term dominates non-radiative processes at room temperature, whilst a temperature-independent term is effective both at 77 K and, in all cases, at considerably higher temperatures. Both effects are sensitive to substitution of the solvent by deuterium atoms: in the case of methanol that of C—H (but not of O—H) is important at room temperature, but that of O—H is especially significant at 77 K. The low-temperature deactivation mechanism is concluded to be due neither to fast, reversible abstraction of a hydroxylic H atom (because of the zero activation energy), nor to fast, reversible electron transfer (because of the isotope effect), but to a physical process.Keywords
This publication has 0 references indexed in Scilit: