Abstract
The non-radiative processes of deactivation from the lowest singlet excited state of aminoanthraquinones have been studied using steady state and time-resolved methods. The fluorescence decay rate constant k f correlates well with the solvent polarity parameter E T(30) in non-hydrogen-bonding solvents. Large deuterium isotope effects in fluorescence lifetimes τ f and quantum yields φ f are observed in the case of 1-amino and 1-methylamino anthraquinones, where the S 1 state is mainly deactivated through internal conversion to the ground state. The temperature dependence of the fluorescence quantum yields of various aminoanthraquinones was also investigated. φ f and τ f exhibited strong temperature dependences in the case of 1-acetylaminoanthraquinone. In the case of 1-acetylaminoan-thraquinone, intersystem crossing to the triplet state is a major deactivation channel from the S 1 and in this derivative a close-lying T 2 state seems to be responsible for the high k isc rate.
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