Abstract
Abstract Ground-state recovery (GSR) times for BDN I and BDN II (bis(4-dimethylaminodithiobenzil) nickel and bis(4-diethylaminodithiobenzil) nickel) have been measured in a variety of solvent and plastic hosts. These and previous measurements are collated and methods of analysing data discussed with a view to explaining some inconsistencies in the published data. Analysis of transmission recovery, which is non-exponential, leads to ambiguous results which can differ drastically from the GSR times - the time constant of the exponential recovery of optical density. The strong solvent dependence of BDN II GSR times, which range from 175 ps in dimethyl sulphoxide to 6.5 ns in benzene is discussed. For electronically active solvents correlations are found between GSR times, dipole moments and coordinating abilities as indicated by solvent structure and basicity.
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