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Fluorescence line narrowing study of cyclopentaneporphyrin chemical dimers at 4.2 K

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DOI
10.1016/0022-2313(96)00034-8
Authors
Starukhin, A.
Zenkevich, E. I.
Shulga, A.
Chernook, A.
Date
1996
Bibliographic entry
Fluorescence line narrowing study of cyclopentaneporphyrin chemical dimers at 4.2 K / A. Starukhin [et al.] // Journal of Luminescence. – 1996. – Vol. 68. – P. 313-323.
Abstract
The monomers of Zn-cyclopentanporphyrins (ZnOEP-cycle and ZnOEP-cycle=CH2) and their chemical dimers covalently linked via isocycles (Zn-cyclodimers) have been studied by the method of fluorescence line narrowing (FLN) in tetrahydrofurane-toluene (3:1) glassy matrixes at 4.2 K. Well-resolved fluorescence spectra upon laser excitation into the S₀→S₁ absorption band have been observed. In contrast to this, it has been shown that the excitation into the region of S₀→S₂ absorption band leads to FLN disappearance for individual monomers. On the basis of this effect positions of the S₀→S₂ electronic transitions in the energy scale have been determined. The normal coordinate treatment of FLN spectra of ZnOEP-cycle=CH2 and those for the Zn-cyclodimers permitted us to determine the normal modes which are connected with the formation of the dimeric species. The weak interaction of Q-transitions of donor (D, ZnOEP-cycle) and acceptor (A, ZnOEP-cycle=CH2) subunits in Zn-cyclodimers manifests itself in the strong fluorescence quenching of D. Under excitation into the S₀→S₁ transition of D the FLN spectra of the dimers (belonging to their A subunits) were not observed. These facts are connected with the effective non-radiative singlet-singlet energy transfer in conditions of essential spectra inhomogeneity.
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https://rep.bntu.by/handle/data/30020
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