MN-55 ESE-ENDOR OF A MIXED-VALENCE MN(III)MN(IV) COMPLEX - COMPARISON WITH THE MN CLUSTER OF THE PHOTOSYNTHETIC OXYGEN-EVOLVING COMPLEX

被引：116

作者：

RANDALL, DW

STURGEON, BE

BALL, JA

LORIGAN, GA

CHAN, MK

KLEIN, MP

ARMSTRONG, WH

BRITT, RD

机构：

[1] UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616

[2] UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720

[3] BOSTON COLL,EUGENE F MERKERT CHEM CTR,DEPT CHEM,CHESTNUT HILL,MA 02167

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 1995年 / 117卷 / 47期

关键词：

D O I：

10.1021/ja00152a021

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Analysis of Mn-55 electron spin echo-electron nuclear double resonance (ESE-ENDOR) spectra obtained on a dinuclear mixed valence Mn(III)Mn(IV) complex [di-mu-oxotetrakis(2,2'-bipyridine)dimanganese(III,IV)] (1) reveals the hyperfine and nuclear quadrupolar parameters for the spin I = 5/2 Mn-55 nucleus of both Mn(III) and Mn(IV) ions. The following parameters are obtained: for Mn(IV), A(perpendicular to) = +212 MHz, A(parallel to) = +231 MHz, P-parallel to 3e(2)Qq/40 = +2.0 MHz, and eta = 0.3, and for Mn(III), A perpendicular to = -480 MHz, A(parallel to) -360 MHz, P-parallel to = -4.5 MHz, and eta = 0.1. The Mn-55 ESE-ENDOR data obtained on the g = 2 Mn multiline EPR signal of the S-2 state of the photosystem II oxygen-evolving complex demonstrate that this EPR signal cannot arise from a dinuclear Mn(III)Mn(IV) center. The ENDOR spectra are consistent with a tetranuclear Mn cluster origin for the photosystem II multiline EPR signal.

引用

页码：11780 / 11789

页数：10

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