Studies of the triplet state of biphenyl derivatives by nanosecond pulse radiolysis

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The triplet characteristics of two biphenyl derivatives (4,4′-dimethylbiphenyl and 4,4′-dimethoxybiphenyl) were studied in benzene solution using the pulse radiolysis technique. Their triplet-triplet absorption spectra were recorded in the 300–550 nm region. The triplet lifetimes were determined to be 16.1 /gms for 4,4′-dimethylbiphenyl and 7.7 /gms for 4,4′-dimethoxybiphenyl. The extinction coefficients at γ max were determined. The triplet energy levels of both these molecules were determined to be 65 ± 1.5 kcal mol −1. Rate constants for energy transfer from benzene and benzophenone triplets to these compounds and from the triplets of these compounds to acceptor molecules such as naphthalene, coumarin-1, benzil and anthracene were determined.