Approximate solutions of the Bloch-McConnell equations for two-site chemical exchange

被引：29

作者：

Abergel, D

Palmer, AG

机构：

[1] Ecole Normale Super, Chim Lab, F-75005 Paris, France

[2] Columbia Univ, Dept Biochem & Mol Biophys, New York, NY 10032 USA

来源：

CHEMPHYSCHEM | 2004年 / 5卷 / 06期

关键词：

Bloch-McConnell equation; chemical exchange; NMR spectroscopy; relaxation; resonance frequencies;

D O I：

10.1002/cphc.200301051

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：

Approximate formulas for the transverse-relaxation rate constant and resonance frequency have been derived for nuclear spins subject to two-site chemical exchange. The new results are more accurate than previous approximations when chemical exchange does not approach the fast-exchange limit or when site populations are not highly asymmetric. Results are derived from an effective average evolution operator that contains contributions from both exact eigenvalues of the Bloch-McConnell equations. These expressions are useful for interpretation of chemical exchange processes in NMR spectroscopy.

引用

页码：787 / 793

页数：7

共 18 条

[1] On the use of the stochastic Liouville equation in nuclear magnetic resonance:: Application to R1ρ relaxation in the presence of exchange [J].