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Spectral kinetic characteristics of pheophytin a cation radical


, : Spectral kinetic characteristics of pheophytin a cation radical. Biofizika 22(6): 1004-1009

The photochemical generation of pheophytin .alpha. cation-radical in acidulated ethanol and acetonitrile was 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 deactivation in ethanol, acetonitrile, aceton have the following values: 1.5 .cntdot. 104, 9 .cntdot. 103, 8.7 .cntdot. 103 s-1, correspondingly. The rate constant of electron transfer from pheophytin a to p-benzoquinone in ethanol solutions is 7.8 .cntdot. 109 l/m .cntdot. s. The recombination constants of pheophytin a cation-radical with .ovrhdot.Q- in acetonitrile, and with quinone neutral radical (.ovrhdot.QH) in acidulated ethanol have the following values: 5 .cntdot. 109 and 2 .cntdot. 109 l/m .cntdot. s, correspondingly.

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