Evstigneev V B
Biofizika. 1977 Nov-Dec;22(6):1004-9.
The photochemical generation of pheophytin a cation-radical in acidulated ethanol and aceto nitril has been studied by the method of flash-photolysis. The bands with maxima at 450, 580 and 800 nm correspond to pheophytin a cation-radical in the differential absorption spectra. The efficient rate constants of pheophytin a triplet state desactivation in ethanol, acetonitril, aceton have the following values: 1.5.10(4), 9.10(3), 8.7.10(3) sec(-1) correspondingly. The rate constant of electron transfer from pheophytin a to p-benzoqui-none in ethanol solutions is 7.8.10(9) l/m.sec. The recombination constants of pheophytin a cation-radical with Q-in acetonitril, and with quinone neutral (QH) in acidulated ethanol have the following values: 5.10(9) and 2.10(9) l/m.sec correspondingly.
通过闪光光解方法研究了在酸化乙醇和乙腈中脱镁叶绿素a阳离子自由基的光化学产生。在差分吸收光谱中，最大吸收峰位于450、580和800nm处的谱带对应于脱镁叶绿素a阳离子自由基。脱镁叶绿素a三重态在乙醇、乙腈、丙酮中的失活有效速率常数分别具有以下值：1.5×10⁴、9×10³、8.7×10³ s⁻¹。在乙醇溶液中，脱镁叶绿素a向对苯醌的电子转移速率常数为7.8×10⁹ l/mol·s。脱镁叶绿素a阳离子自由基与乙腈中的Q⁻以及酸化乙醇中的醌中性体（QH）的复合常数分别具有以下值：5×10⁹和2×10⁹ l/mol·s。
