The Effect of Mercury on the Triplet State of Hexafluoroacetone [l]
Abstract
Abstract Evidence is summarized for the deactivation of the n π* triplet state of hexafluoroacetone by mercury vapour. The lifetimes of that state in the presence and absence of mercury vapour differ by a factor of 11.8. Photochemical decomposition from the triplet state (the quantum yield for decomposition extrapolated to infinite pressure of ketone) is a factor of 10.5 larger under mercury free than under mercury saturated conditions. Values of the ratio of phosphorescence to fluorescence under the two conditions then permit the demonstration that the singlet n π* state is not significantly deactivated. The deactivation is absent for acetone and acetone‐d 6 but is also observed, with smaller efficiency, for 1,1,1‐trifluoroacetone. It is suggested that the deactivation occurs via the formation of a charge transfer complex.
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