Abstract
Abstract Empirical data is presented to describe the relationship between the fluorescence lifetimes (τf) and the position of substituents on the parent molecule, Phenyl-N-Methylcarbamate. The fluorescence lifetimes are determined using time correlated single photon counting technique1. It is found that increasing lifetimes with position of substitution follows the order, meta > para > ortho in the case of mono-alkyl substituted carbamates. Also, the results below indicate that the long fluorescence lifetime of 4-Dimethylamino-3,5-Xylyl-N-Methylcarbamate, τf 108 ns2 originates from an n-II∗ lowest excited state and not the usual II-II∗ lowest excited states of the other N-Methylcarbamates studied.
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