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Factor analysis of deuterium isotope effects on C-13 NMR chemical shifts in Schiff bases

机译:氘同位素对席夫碱中C-13 NMR化学位移影响的因子分析

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We have analyzed deuterium isotope effects on C-13 chemical shifts in a series of o-hydroxy Schiff bases by applying factor analysis. Two orthogonal factors were obtained that explain about 80 and 10% of the variance of the data. The numerical values of these factors can be related to H-1 NMR chemical shifts of the proton involved in the intramolecular bonds delta(XH) (X=O or N). Such a relation allows one to identify clusters of compounds with different tautomeric forms of hydrogen bonding. Application of a similar approach to solution C-13 NMR chemical shifts produces three important factors. which have a different structure to factors describing isotope effects. This illustrates well the different nature of chemical shifts and isotope effects. the three factors explain about 54, 15, and 13% of variance. They can be rationalized and are strongly related to the electronic properties and location of substituents.
机译:通过应用因子分析,我们分析了氘同位素对一系列邻羟基席夫碱中C-13化学位移的影响。获得了两个正交因子,它们解释了数据方差的80%和10%。这些因素的数值可能与参与分子内键delta(XH)(X = O或N)的质子的H-1 NMR化学位移有关。这种关系使人们能够鉴定具有不同互变异构形式氢键的化合物簇。将类似方法应用于溶液C-13 NMR化学位移会产生三个重要因素。与描述同位素效应的因素的结构不同。这很好地说明了化学位移和同位素效应的不同性质。这三个因素可解释约54%,15%和13%的方差。它们可以合理化,并且与电子性质和取代基的位置密切相关。

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