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- W2018846642 abstract "Symmetrically (1–4) and unsymmetrically (5–7) benzoannelated metal-free porphyrazines bearing tert-butyl substituents have been investigated in regard to their photophysical properties and their splitting behavior of the Q-band. Q-band splitting in the series of symmetrical tetraazaporphyrine (1), tetrabenzoporphyrazine (2), tetranaphthoporphyrazine (3), is decreased from ΔQ ∼2000 to ∼0 cm−1 while the tetraanthraporphyrazine system (4) shows a low splitting of about ΔQ=265 cm−1 again. In the unsymmetrically substituted series in going from tribenzomononaphthoporphyrazine (6) (ΔQ=903 cm−1) to tribenzomonoanthraporphyrazine (7) (ΔQ=875 cm−1) Q-band splitting is very similar while tribenzoporphyrazine (5) (ΔQ=2073 cm−1) exhibits a drastic increase. In the series 1–4, fluorescence lifetimes 2.6, 5.5, 3.0, 0.5 ns, fluorescence quantum yields 0.17, 0.44, 0.19, 0.01 and singlet oxygen quantum yields 0.53, 0.21, 0.03, <10−4 were determined. Fluorescence lifetimes of 5–7 are in the range 3.1–4.7 ns. The absorption- and fluorescence spectra as well as the fluorescence lifetimes of the separated isomers of 5 do not differ." @default.
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- W2018846642 date "2004-04-01" @default.
- W2018846642 modified "2023-09-27" @default.
- W2018846642 title "Photophysical properties of benzoannelated metal-free phthalocyanines" @default.
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- W2018846642 doi "https://doi.org/10.1016/j.jphotochem.2003.12.003" @default.
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