PELDOR at S- and X-band frequencies and the separation of exchange coupling from dipolar coupling

被引：87

作者：

Weber, A ^{[1
]}

Schiemann, O ^{[1
]}

Bode, B ^{[1
]}

Prisner, TF ^{[1
]}

机构：

[1] Goethe Univ Frankfurt, Inst Phys & Theoret Chem, D-60439 Frankfurt, Germany

来源：

JOURNAL OF MAGNETIC RESONANCE | 2002年 / 157卷 / 02期

关键词：

dipolar coupling; PELDOR; S-band EPR; pulse EPR; exchange coupling;

D O I：

10.1006/jmre.2002.2596

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

A pulsed electron double resonance (PELDOR) setup working at S-band frequencies is introduced and its performance compared with an X-band setup. Furthermore, to verify experimentally that it is possible to disentangle the dipolar coupling nu(Dip) from the exchange coupling J by PELDOR we synthesized and investigated four bisnitroxide radicals. They exhibit in pairs the same distances r(AB) between the nitroxide moieties but only one of each pair possesses a non-zero J. The experimental values for rAB match the ones from molecular modeling very well for the molecules without exchange coupling. For one bisnitroxide it was possible to separate nu(Dip) from J and to ascertain the magnitude and sign of J to +11 MHz (antiferromagnetic spin-spin coupling). (C) 2002 Elsevier Science (USA).

引用

页码：277 / 285

页数：9

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