Phosphorescence properties of pyridine and its methyl derivatives in he vapor phase.

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  • Suzuki Masayuki
    Division of Chemistry, Research Institute of Applied Electricity, Hokkaido University
  • Fujita Masahisa
    Division of Chemistry, Research Institute of Applied Electricity, Hokkaido University
  • Takemura Takeshi
    Division of Chemistry, Research Institute of Applied Electricity, Hokkaido University
  • Baba Hiroaki
    Division of Chemistry, Research Institute of Applied Electricity, Hokkaido University

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  • Phosphorescence Properties of Pyridine and Its Methyl Derivatives in the Vapor Phase

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The phosphorescence spectra, lifetimes, and quantum yields of pyridine and its methyl derivatives, 2-picoline, 3-picoline, and 2,6-lutidine in the vapor phase have been measured with the aid of a specially designed circuit by means of control of the voltage imposed on the photomultiplier. The phosphorescence spectrum shifts to shorter wavelengths with increasing methylation. The phosphorescence lifetimes and quantum yields of pyridine and the picolines are of the order of 1 μs and 10−7 both values being one order of magnitude smaller than the corresponding values for the lutidine. These observations are explained by assuming that (1) the lowest triplet state (T1) and the next lowest triplet (T2) are of 3(π,π*) and 3(n,π*) types respectively, (2) the energy gap between T1 and T2 is small, especially in the unsubstituted pyridine, and (3) the potential energy curve for T1 is distorted according to the energy gap, as the result of a pseudo-Jahn-Teller type of interaction between T1 and T2.

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