Fluorescence yields of triphenylcarbonium derivatives.
The abs. fluorescence quantum yields FF of 10 Ph3C+ derivs., e.g. I and II, were measured and related with the change of bond order between the central C atom and the Ph groups during electronic transitions by MO-SCF-CI calcns. FF is reduced by Ph group rotation only at strong coupling of the p-system to the other part of the mol. Thus, the bond order change is a measure for the coupling.
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