FORBIDDEN NUCLEAR-MAGNETIC-RESONANCE TRANSITIONS BETWEEN SINGLET AND TRIPLET-STATES IN SPIN-1/2 PAIR SYSTEMS IN ROTATING SOLIDS

被引：25

作者：

NAKAI, T

CHALLONER, R

MCDOWELL, CA

机构：

[1] Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Y6

来源：

CHEMICAL PHYSICS LETTERS | 1991年 / 180卷 / 1-2期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1016/0009-2614(91)87108-N

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：

Forbidden transitions between singlet and triplet nuclear spin states in chemically equivalent spin-1/2 pair systems were observed in the P-31 cross-polarization magic-angle spinning (CPMAS) nuclear magnetic resonance (NMR) spectrum of 1,2-bis(2,4,6-tri-tert-butylphenyl) diphosphene (TBPDP). The fine structure of the resonance lines changed dramatically with rotor spinning frequency. Using the average Hamiltonian theory, the origin of these singular phenomena was revealed to be due to high-order anisotropic interactions in the solid state. From analysis of the spectra, the value of the J coupling between the chemically equivalent P-31 nuclei in TBPDP was estimated to be 577 +/- 15 Hz.

引用

页码：13 / 18

页数：6

共 63 条

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