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- Title
Photoinduced Breaking of the Fe-O<sub>2</sub> Bond in Hemoglobin: Dissociation Quantum Yield, Excited Electronic States, and Nonradiative Relaxation Processes.
- Authors
Dzhagarov, B. M.; Lepeshkevich, S. V.; Panarin, A. Yu.; Parkhats, M. V.; Chaikovskii, A. F.
- Abstract
Bimolecular recombination of molecular oxygen with human hemoglobin upon excitation in different spectral ranges is studied by nanosecond laser kinetic spectroscopy. The results obtained are fundamentally different; i.e., rather efficient photodissociation takes place in the case of excitation into the Q-band of the ππ* nature and is practically absent upon excitation into the near-IR band corresponding to the electron transfer from the porphyrin a2u orbital to a mixed orbital formed of the iron d orbital and the free π orbital of molecular oxygen. Analysis of these data, together with data obtained previously using the techniques of nano-, pico-, and femtosecond spectroscopy, allowed us to describe the mechanism and dynamics of the photodissociation reaction and intraheme relaxation processes.
- Subjects
OXYHEMOGLOBIN; PHOTOINDUCED electron transfer; PHOTODISSOCIATION; CHARGE transfer; SUPEROXIDES; PHOTOLYSIS (Chemistry)
- Publication
Optics & Spectroscopy, 2018, Vol 125, Issue 1, p123
- ISSN
0030-400X
- Publication type
Article
- DOI
10.1134/S0030400X1807007X