Influence of chemical substitution and electronic effects on the triplet state kinetics of xanthene dyes
Literature Information
Intersystem crossing rate constants and triplet lifetimes of structurally related xanthene dyes in air-equilibrated ethylene glycol are presented. By using a new time-resolved laser-scanning-microscopy technique the results are obtained with high accuracy. The relationship between the triplet quantum yield and the molecular structure is investigated. Electron withdrawing substituents yield a decrease of the intersystem crossing rate constant. This result is obtained for all investigated amino-group substitution patterns of the xanthene dyes. The introduction of additional branching of the chromophoric system causes an enhancement of the intersystem crossing rate constant by more than a factor of 2. These results cannot be explained by the energy gap rule. The triplet lifetime is in the range of a few microseconds and increases with the relative molecular mass of the dye.
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