1975
DOI: 10.1073/pnas.72.12.4956
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Primary charge separation in bacterial photosynthesis: oxidized chlorophylls and reduced pheophytin.

Abstract: Bacteriopheophytin, the magesium-free base of bacteriochlorophyll, undergoes reversible one-electron reduction in organic solvents to yield an anionic free radical with characteristic optical and electron spin resonance spectra. The which was pumped away to codistill water, and the pigment was dried under reduced pressure (10-3 Pa) for several hours. RESULTSThe anion radical of bacteriopheophytin BPh exhibits a reversible, one electron, halfwave reduction potential E1/2 of -0.58 against NHE in CH2Cl2.

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Cited by 289 publications
(187 citation statements)
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“…If normal forward photochemistry is to occur, this state reduces X in 100-200 ps [2,3] but if this is blocked by the prior chemical reduction [4] or removal [5] of X, the transient state has a lifetime of nanoseconds before decaying (t½ ~, 10 ns at 300°K; "~ 30 ns at 80°K [4,6]). It has been suggested [7] that [-" has some spectrophotomeric characteristics of reduced bacteriopheophytin (BPh-").…”
Section: Introductionmentioning
confidence: 99%
“…If normal forward photochemistry is to occur, this state reduces X in 100-200 ps [2,3] but if this is blocked by the prior chemical reduction [4] or removal [5] of X, the transient state has a lifetime of nanoseconds before decaying (t½ ~, 10 ns at 300°K; "~ 30 ns at 80°K [4,6]). It has been suggested [7] that [-" has some spectrophotomeric characteristics of reduced bacteriopheophytin (BPh-").…”
Section: Introductionmentioning
confidence: 99%
“…It was concluded that state PF could be represented by [(BChl);' I.-]. At the same time, Fajer et al [6] described the in vitro spectrophotometric, electron paramagnetic resonance (EPR) and electrochemical properties of the isolated BPh'-/BPh couple (it was BPh-a) in organic solvents. In combining the absorbance changes they measured for the BPh reduction with those known for reaction center (BChl), oxidation, the resulting difference spectrum accounted for several features of the state PF; it was concluded that the intermediary state was [(BChl);+ BPh'-1.…”
Section: Pheophytins and The Photosynthetic Reaction Centermentioning
confidence: 99%
“…Recent work by Fajer et al [7] with isolated monomeric BPh-b has yielded an in vitro Em value of -5 0 0 to -550mV the value being solvent dependent. This value together with the narrow, microwave sensitive EPR signal of the BPh-b'-radical are interesting differences from the in uiuo reaction center situation.…”
mentioning
confidence: 99%
“…PP may correspond to a complex of the oxidised reaction centre bacteriochlorophyll dimer with a reduced bacteriopheophytin molecule, i.e. state P'BPheo- [3,4]. Unless normal photochemistry is blocked this state decays with a half-time of about 100 ps to 250 ps, presumably with the concomitant reduction of the 'primary' acceptor, X (probably an iron-ubiquinone complex, see refs.…”
Section: Introductionmentioning
confidence: 99%