VIBRATIONAL-SPECTRA AND CONFORMATION OF POLYETHYLENE-GLYCOL COMPLEXED WITH CALCIUM AND MAGNESIUM CHLORIDES

被引：46

作者：

HORIKOSHI, K ^{[1
]}

HATA, K ^{[1
]}

KAWABATA, N ^{[1
]}

IKAWA, SI ^{[1
]}

KONAKA, S ^{[1
]}

机构：

[1] HOKKAIDO UNIV,FAC SCI,DEPT CHEM,SAPPORO,HOKKAIDO 060,JAPAN

来源：

JOURNAL OF MOLECULAR STRUCTURE | 1990年 / 239卷

关键词：

D O I：

10.1016/0022-2860(90)80200-4

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：

Infrared and Raman spectra of polyethylene glycol (PEG) complexed with calcium and magnesium chlorides have been measured in aqueous solutions and in isolated complexes. Composition of the calcium complex was obtained as 4.4±0.1 (CH2CH2O unit):1 (CaCl2):4.5±0.5 (H2O) by elementary analysis. From these results, the conformation of PEG in the calcium complex has been proposed to be an alternate conbination of two conformational sequences, (-TGT-TG′T-GTT-TTG-) and (-TGT-TG′T-TGT-GTT-TTG-). For the magnesium complex, the conformation of PEG is supposed to be similar to that of crystalline PEG, with repetition of TGT for the -CH2CH2O units. The difference in the structure between the calcium and magnesium complexes was explained by the difference in the cation's size. © 1990.

引用

页码：33 / 42

页数：10

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