溶剂对C18烷基改性硅胶构象有序性的影响。
Influence of solvents on the conformational order of C18 alkyl modified silica gels.
作者信息
Srinivasan Gokulakrishnan, Müller Klaus
机构信息
Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany.
出版信息
J Chromatogr A. 2006 Mar 31;1110(1-2):102-7. doi: 10.1016/j.chroma.2006.01.095. Epub 2006 Feb 7.
The influence of solvents on the conformational order of C(18) alkyl modified silica gels is studied by means of variable temperature FTIR spectroscopy. Symmetric and anti-symmetric CH(2) stretching modes were utilized for getting qualitative information about the changes in alkyl chain conformational order as a function of both protonated and perdeuterated solvents. It was found that interaction between the C(18) alkyl modified silica gels and the mobile phase results in pronounced changes of the alkyl chain conformational order. Furthermore, it was observed that some perdeuterated solvents exhibit isotope effects, which again is reflected by a different alkyl chain conformational order as compared to the corresponding stationary phases with protonated solvents.
通过变温傅里叶变换红外光谱法研究了溶剂对C(18)烷基改性硅胶构象有序性的影响。利用对称和反对称CH(2)伸缩模式获取有关烷基链构象有序性随质子化和全氘代溶剂变化的定性信息。发现C(18)烷基改性硅胶与流动相之间的相互作用导致烷基链构象有序性发生显著变化。此外，观察到一些全氘代溶剂表现出同位素效应，这同样通过与相应质子化溶剂固定相相比不同的烷基链构象有序性反映出来。
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