Intramolecular processes of excitation energy redistribution in metalloporphyrins: examination by transient absorption and resonance Raman and coherent anti-Stokes Raman scattering spectroscopies

Pavel A. Apanasevich; V. S. Chyrvony; Sergei G. Kruglik; Vladimir V. Kvach; Valentin A. Orlovich

doi:10.1117/12.57388

1 May 1991 Intramolecular processes of excitation energy redistribution in metalloporphyrins: examination by transient absorption and resonance Raman and coherent anti-Stokes Raman scattering spectroscopies

Pavel A. Apanasevich, V. S. Chyrvony, Sergei G. Kruglik, Vladimir V. Kvach, Valentin A. Orlovich

Author Affiliations +

Proceedings Volume 1403, Laser Applications in Life Sciences; (1991) https://doi.org/10.1117/12.57388
Event: Laser Applications in Life Sciences, 1990, Moscow, Russian Federation

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.

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Pavel A. Apanasevich, V. S. Chyrvony, Sergei G. Kruglik, Vladimir V. Kvach, and Valentin A. Orlovich "Intramolecular processes of excitation energy redistribution in metalloporphyrins: examination by transient absorption and resonance Raman and coherent anti-Stokes Raman scattering spectroscopies", Proc. SPIE 1403, Laser Applications in Life Sciences, (1 May 1991); https://doi.org/10.1117/12.57388

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KEYWORDS

Raman spectroscopy

Absorption

Picosecond phenomena

Spectroscopy

Copper

Absorption spectroscopy

Ions

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