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• W1983420545 abstract "So far, the orientations of transition dipole moments in tetrapyrroles have been investigated mainly by fluorescence anisotropy spectroscopy that allows the determination of the orientations of S0–Sn absorption transition dipoles with respect to a fixed emission transition dipole. However, little is known about the orientation of excited state absorption (ESA) transition dipole moments. Transient absorption spectroscopy (TAS) with polarized probing permits access to these transitions. We present photoinduced fluorescence and TAS anisotropy data of three tetrapyrroles of different molecular symmetries. The orientation of the S0–Sn and S1–Sn transition dipoles were extracted from these data. A distinctive influence of the molecular symmetry was found for tetra(t-butyl)-phthalocyanine and its zinc complex due to a doubly degenerate S1 state in the latter. For a reduced porphyrin, pheophorbide-a, the higher asymmetry of the molecule influences the orientation of the electronic transition dipole moment only slightly." @default.
• W1983420545 created "2016-06-24" @default.
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• W1983420545 date "2003-05-01" @default.
• W1983420545 modified "2023-10-16" @default.
• W1983420545 title "Experimental determination of the orientation of excited state transition dipoles in tetrapyrroles with different molecular symmetries" @default.
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• W1983420545 doi "https://doi.org/10.1016/s0030-4018(03)01343-9" @default.
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