SOLID-STATE C-13-NMR STUDY OF CONFORMATIONS OF OLIGOSACCHARIDES AND CELLULOSE - CONFORMATION OF CH2OH GROUP ABOUT THE EXO-CYCLIC C-C BOND
SOLID-STATE C-13-NMR STUDY OF CONFORMATIONS OF OLIGOSACCHARIDES AND CELLULOSE - CONFORMATION OF CH2OH GROUP ABOUT THE EXO-CYCLIC C-C BOND
复制标题
DOI：
10.1007/bf00281948
复制
发表时间：
1983-01-01
期刊：
影响因子：
3.2
通讯作者：
KITAMARU, R
中科院分区：
文献类型：
--
作者：
HORII, F;HIRAI, A;KITAMARU, R
CP/DD/MAS 13 C NMR谱已获得不同的单糖，低聚糖，和纤维素。发现CH_2OH碳的化学位移与外环C-C键的扭转角χ之间存在简单的线性关系。化学位移分为60- 62.6ppm、62.5- 64.5ppm和65.5- 66.5ppm三组，分别与gauche-gauche、gauche-trans和trans-gauche构象有关。在此基础上，对纤维素中CH_2 OH碳的构象进行了讨论。
CP/DD/MAS13C NMR spectra have been obtained for different monosaccharides, oligosaccharides, and cellulose. It has been found that a simple linear relationship exists between the chemical shift of the CH2OH carbon and the torsion angle χ about the exo-cyclic C-C bond. The chemical shifts fall into three groups of 60–62.6 ppm, 62.5–64.5 ppm, and 65.5–66.5 ppm, which are related togauche-gauche, gauche-trans, andtrans-gaucheconformations, respectively. On the basis of these results the conformation of the CH2OH carbon of cellulose is also discussed.