ESR and Phosphorescence Spectra of the Triplet States of Phenyl s-Triazines and Phenyl Benzenes

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Abstract
ESR and optical measurements have been made on the lowest triplet state of a series of phenyl s‐triazines and polyphenyl benzenes. The features of the phosphorescence spectra and the value of the zero‐field splitting parameters of these azines and their hydrocarbon analogs leads to the assignment of the lowest triplet state of the phenyl triazines as (π, π*). The effect of nitrogen substitution is discussed.