title: The lowest excited triplet (T1) energies of p-methoxybenzaldehyde and p-cyanobenzaldehyde vapors estimated from the temperature dependence of the T2(n, pi*) phosphorescence and the S1(n, pi*) fluorescence spectra.
abstract: Invisible energy levels of the T1(pi, pi*) state of p-methoxybenzaldehyde (anisaldehyde) and p-cyanobenzaldehyde vapors have been estimated through the temperature dependence of the T2(n, pi*) --> S0 phosphorescence and the S1(n, pi*) --> S0 delayed fluorescence spectra. It is shown that the T1(pi, pi*) levels are located at 900 +/- 100 and 300 +/- 100 cm(-1) below the T2(n, pi*) levels, respectively, for p-methoxybenzaldehyde and p-cyanobenzaldehyde vapors. The estimated T1 energy levels are in good agreement with the phosphorescence origins in rigid glass at 77 K.
authors.affiliation: Chemistry Department, Miyazaki Medical College, Kiyotake-cho, Miyazaki 889-1692, Japan. titoh@fc.miyazaki-med.ac.jp
authors.forename: Takao
authors.initials: T
authors.lastname: Itoh
mesh_terms: D001547:Benzaldehydes / Q000032:analysis* / Q000737:chemistry; D002251:Carbon Tetrachloride / Q000494:pharmacology; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013696:Temperature
chemical_list: D001547:Benzaldehydes; C024896:4-anisaldehyde; D002251:Carbon Tetrachloride; C032175:benzaldehyde