Photoinduced spin-polarized radical ion pair formation in a fixed-distance photosynthetic model system at 5 K

Photoinduced, multistep charge separation in bacterial reaction centers proceeds from the lowest excited singlet state of the dimeric bacteriochlorophyll electron donor in two steps, to yield a weakly interacting dimer cation-quinone anion radical pair, P{sup +}-Q{sup {minus}}, separated by 28 {angs...

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Bibliographic Details
Published in:Journal of the American Chemical Society 1990-05, Vol.112 (11), p.4559-4560
Main Authors: Wasielewski, Michael R, Gaines, George L, O'Neil, Michael P, Svec, Walter A, Niemczyk, Mark P
Format: Article
Language:English
Subjects:
BASIC BIOLOGICAL SCIENCES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
ION PAIRS
MEASURING METHODS
METALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS 550500 > Metabolism
PHOTOSYNTHESIS
PHOTOSYNTHETIC REACTION CENTERS
PORPHYRINS
SYNTHESIS
ULTRALOW TEMPERATURE
ZINC
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Summary:Photoinduced, multistep charge separation in bacterial reaction centers proceeds from the lowest excited singlet state of the dimeric bacteriochlorophyll electron donor in two steps, to yield a weakly interacting dimer cation-quinone anion radical pair, P{sup +}-Q{sup {minus}}, separated by 28 {angstrom}. Recently, we developed criteria for achieving high quantum yield charge separation in porphyrin-based-donor-acceptor systems at cryogenic temperatures. Using this information as a predictive model, we synthesized compound 1, TAPD-ZP-NQ, which consists of a zinc porphyrin primary electron donor, ZP, positioned between a naphthoquinone electron acceptor, NQ, and an N,N,N,N-tetraalkyl-p-phenylenediamine secondary electron donor, TADP.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja00167a072