THE INTRAMOLECULAR OH BOND-LENGTH OF WATER IN A CONCENTRATED POLY(ETHYLENEOXIDE) SOLUTION - AN NMR RELAXATION STUDY

被引:21
作者
BIEZE, TWN
VANDERMAAREL, JRC
LEYTE, JC
机构
[1] Department of Physical and Macromolecular Chemistry, Gorlaeus Laboratories, Leiden University, 2300 RA Leiden
关键词
D O I
10.1016/0009-2614(93)E1245-C
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
The proton relaxation rates of normal as well as O-17-enriched water and the deuterium relaxation rate in H-2-enriched water were measured in 10 monomolal poly(ethyleneoxide) solutions. The O-17-H-1 intramolecular dipolar contribution to the proton relaxation rate was determined. From these experimental parameters the intramolecular OH-bond distance in the water molecule was calculated. It was found that this distance is increased by a small (1%) but significant amount compared to the pure water value. The results indicate that the solvent shows increased hydrogen bonding at the hydrophilic as well as the hydrophobic interface.
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页码:56 / 62
页数:7
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