Mechanism of charge transfer in the molecular DPQ complex studied by time-resolved fluorescence spectroscopy

Journal Article · Thu Aug 22 00:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100170a011· OSTI ID:7273576

Borovkov, V V; Evstigneeva, R P; Struganova, I A ^[1]; Kamalov, V F; Toleutaev, B N ^[2]

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1. Lomonsov Inst. of Fine Chemical Technology, Moscow (Russian Federation)
2. Moscow State Univ. (Russian Federation)

Recent results of the X-ray analysis and femtosecond spectroscopy of photosynthetic bacteria reaction centers have contributed very much to the understanding of the primary events in photosynthesis. The pathways of charge separation in the dimethylaniline-mesoporphyrin II-naphthoquinone triad DPQ and its Zn complex were established. The rate constants of electron transfer from P and ZnP to Q were measured to be k = 1.5 {times} 10{sup 9} s{sup {minus}1} and k > 5 {times} 10{sup 10} s{sup {minus}1}, respectively, from the results of picosecond fluorescence spectroscopy. The transformation of the DPQ and DZnPQ triads to the reduced form by NaBH{sub 4} treatment results in blocking of the electron-transfer channel from both P and ZnP to Q. The role of structural and conformational changes of triads in the electron-transfer process is discussed.

• OSTI ID: 7273576
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 95:17; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
AMINES
CHARGE TRANSPORT
AROMATICS
PORPHYRINS
QUINONES
ZINC COMPLEXES
CHEMICAL REACTION KINETICS
CONFORMATIONAL CHANGES
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
REDUCTION
TIME RESOLUTION
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COMPLEXES
DATA
EMISSION SPECTROSCOPY
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
KINETICS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
REACTION KINETICS
RESOLUTION
SPECTROSCOPY
TIMING PROPERTIES
400500* - Photochemistry
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)