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Proceedings Paper

Intramolecular processes of excitation energy redistribution in metalloporphyrins: examination by transient absorption and resonance Raman and coherent anti-Stokes Raman scattering spectroscopies
Author(s): Pavel A. Apanasevich; V. S. Chyrvony; Sergei G. Kruglik; Vladimir V. Kvach; Valentin A. Orlovich
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Paper Abstract

The steady interest to the metalloporphyrins having the central metal with unfilled d-electronic shell is caused by the rich variety of photoinduced chemical-physical processes they participate in and by the possibility to model on their basis the behavior of native biological systems. From the photophysical point of view, copper porphyrins (Cu-P) have two distinct peculiarities, associated with the presence of a Cu ion: 1) The unpaired electron to the d2_2 orbital of copper (II) ion couples with the normal porphyrin (ir, ir*) excited states, this "allows" the nonradiative transition 2S ...+ 2T1 with the rate constant of over 1013 1 resulting in the absence of fluorescence from the Si state. 2) A charge-transfer (CT) state lies close in energy above T1 in noncoordinating solvents (benzene, toluene) and is thermally accessible, that causes the relatively short relaxation time from T1 (10-100 ns) at room temperature. The processes of formation of complexes between Cu-P in the ground and excited T1 states and nitrogen- containing molecules (pyridine, piperidine) have been studied by picosecond absorption spectroscopy.' We have observed for the first time the phenomenon of the oxygen-containing solvents influence on the energy relaxation processes in excited Cu-P. The comprehensive study of this effect is presented.

Paper Details

Date Published: 1 May 1991
PDF: 3 pages
Proc. SPIE 1403, Laser Applications in Life Sciences, (1 May 1991); doi: 10.1117/12.57388
Show Author Affiliations
Pavel A. Apanasevich, B. I. Stepanov Institute of Physics (Belarus)
V. S. Chyrvony, B. I. Stepanov Institute of Physics (Belarus)
Sergei G. Kruglik, B. I. Stepanov Institute of Physics (Belarus)
Vladimir V. Kvach, B. I. Stepanov Institute of Physics (Belarus)
Valentin A. Orlovich, B. I. Stepanov Institute of Physics (Belarus)


Published in SPIE Proceedings Vol. 1403:
Laser Applications in Life Sciences

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