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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >A new approach toNMR chemical shift additivity parameters using simultaneous linear equation method
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A new approach toNMR chemical shift additivity parameters using simultaneous linear equation method

机译:联立线性方程法求解NMR化学位移加和参数的新方法

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摘要

A new approach to NMR chemical shift additivity parameters using simultaneous linear equation method has been introduced. Three general nitrogen-15 NMR chemical shift additivity parameters with physical significance for aliphatic amines in methanol and cyclohexane and their hydrochlorides in methanol have been derived. A characteristic feature of these additivity parameters is the individual equation can be applied to both open-chain and rigid systems. The factors that influence the N-15 chemical shift of these substances have been determined. A new method for evaluating conformational equilibria at nitrogen in these compounds using the derived additivity parameters has been developed. Conformational analyses of these substances have been worked out. In general, the results indicate that there are four factors affecting the N-15 chemical shift of aliphatic amines; paramagnetic term (p-character), lone pair-proton interactions, proton-proton interactions, symmetry of alkyl substituents and molecular association. (c) 2006 Elsevier B.V. All rights reserved.
机译:介绍了一种使用联立线性方程组方法求解NMR化学位移可加性参数的新方法。推导了对甲醇和环己烷中的脂肪族胺及其在甲醇中的盐酸盐具有物理意义的三个一般的氮15 NMR化学位移加和参数。这些可加性参数的特征是,单个方程式可同时应用于开链和刚性系统。已经确定了影响这些物质的N-15化学位移的因素。开发了一种新的方法,使用推导的加性参数评估这些化合物中氮的构象平衡。已经对这些物质进行了构象分析。通常,结果表明有四个因素影响脂族胺的N-15化学位移。顺磁性术语(p-字符),孤对质子相互作用,质子-质子相互作用,烷基取代基的对称性和分子缔合。 (c)2006 Elsevier B.V.保留所有权利。

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