TIME-RESOLVED W-BAND (95 GHZ) EPR SPECTROSCOPY OF ZN-SUBSTITUTED REACTION CENTERS OF RHODOBACTER-SPHAEROIDES R-26

被引：102

作者：

PRISNER, TF ^{[1
]}

VANDEREST, A ^{[1
]}

BITTL, R ^{[1
]}

LUBITZ, W ^{[1
]}

STEHLIK, D ^{[1
]}

MOBIUS, K ^{[1
]}

机构：

[1] TECH UNIV BERLIN,MAX VOLMER INST,D-10623 BERLIN,GERMANY

来源：

CHEMICAL PHYSICS | 1995年 / 194卷 / 2-3期

关键词：

D O I：

10.1016/0301-0104(95)00016-H

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Transient EPR spectra of protonated and deuterated Zn-substituted reaction centres of Rhodobacter sphaeroides R-26, measured at a microwave frequency of 95 GHz and an external magnetic field of 3.5 T, are presented. The high-field/high-frequency spin-polarized spectrum of the correlated coupled radical pair (P865OA-.)-O-+. after laser flash excitation is a very sensitive monitor of the relative orientation of the two g-matrices and the dipolar tenser with respect to each other. Therefore, detailed structural information of the RC concerning the relative orientation of the primary donor P-856(+.) and the acceptor Q(A)(-.) with respect to the axis connecting the two molecules in the RC can be derived. Together with the information obtained by high-field cw-EPR on single crystals, the enhanced resolution of the polarized high-field spectra allows an unambiguous assignment of the g-matrix of the donor P-865(+.) to the molecular axis system. The experimental results are compared with earlier X-band (9 GHz) and K-band (24 GHz) EPR experiments.

引用

页码：361 / 370

页数：10

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