Über die Fluoreszenzfähigkeit von Triphenylcarboniumderivaten / Fluorescence Yields of Triphenylcarbonium Derivatives

The absolute fluorescence yields of triphenylcarbonium derivatives are correlated with the change of bond order between central-C-atom and phenyl group during the electronic transition. The fluo rescence yield is reduced by a rotation of the phenyl group only if the π-electron system of the phenyl group is sufficiently strong coupled to the other part of the molecule. The change of bond order can be assumed as a measure for the coupling.