DOUBLE ELECTRON-ELECTRON RESONANCE SPIN-ECHO MODULATION - SPECTROSCOPIC MEASUREMENT OF ELECTRON-SPIN PAIR SEPARATIONS IN ORIENTATIONALLY DISORDERED SOLIDS

被引:214
作者
LARSEN, RG [1 ]
SINGEL, DJ [1 ]
机构
[1] HARVARD UNIV, DEPT CHEM, 2 OXFORD ST, CAMBRIDGE, MA 02138 USA
关键词
D O I
10.1063/1.464916
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
A DEER (double electron-electron resonance) spin-echo technique was applied to measure the electron-electron dipolar spectrum of a frozen toluene solution of the biradical, 2,6-bis[(((2,2,5,5-tetramethyl-1-oxypyrrolin-3-yl)carbonyl)oxy)]-anthracene. Modulation of the DEER spin-echo envelope was observed and identified as originating from the dipolar coupling between the two nitroxide spins of the biradical. Fourier transformation of the modulated components of the echo envelope yielded a dipolar spectrum from which a spin-pair separation of 19.73 +/- 0.14 angstrom was calculated. Constraints on the relative orientation of the two nitroxide spin moieties were obtained by analysis of the effect of the microwave pulse orientational selectivity on the DEER modulation amplitudes. Molecular models of the studied compound exhibit structures that correspond well with the structural information deduced by DEER spectroscopy.
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页码:5134 / 5146
页数:13
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