Abstract
Abstract The emission spectra of 1,4-naphthoquinone (NQ) and 2-methyl-1,4-naphthoquinone (MNQ) vapors have been investigated at various temperatures in the presence of added foreign gases (≈100 Torr). The results indicate that in both NQ, and MNQ, the emission consists of T1(n, π*)→S0 phosphorescence and weak E-type delayed fluorescence, S1(n, π*)→S0, the latter lying at higher frequencies. This new interpretation of the vaporphase emission spectra of the naphthoquinones, which is substantially different from the interpretations given by previous authors, is based on and consistent with the following observations: (1) When the temperature is raised, the ratio of the fluorescence intensity to the phosphorescence intensity increases; (2) the S1–T2 energy separations, 1365±60 and 1500±200 cm−1 for NQ, and MNQ, respectively, determined from the temperature dependence of the emission intensities agree with the corresponding values obtained from spectral data; (3) the emission lifetimes obtained by monitoring the fluorescence and phosphorescence are identical.
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