Hydrogen bonding in a host-guest system: C-undecylcalix[4]resorcinarene and water in benzene

被引:10
作者
Wilson, CF [1 ]
Eastman, MP [1 ]
Hartzell, CJ [1 ]
机构
[1] NO ARIZONA UNIV,DEPT CHEM,FLAGSTAFF,AZ 86011
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 45期
关键词
D O I
10.1021/jp971808h
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 behavior of water in;a benzene solution of C-undecylcalix[4]resorcinarene (UR) is studied by H-1 2D NMR exchange spectroscopy and by 1D NMR. The rate constants for exchange of the UR hydroxyl protons, H-a, with water over the temperature range 298-338 K are 0.7-4.6 s(-1) and those for the exchange of UR hydroxyl protons, Hb, over the temperature range 298-328 K are 1.8-8.1 s(-1). Activation energies calculated for these exchange processes are 9.0 +/- 0.5 kcal/mol and 10.2 +/- 1.0 kcal/mol, respectively. The chemical shift of dissolved water is largely dependent upon the concentration of UR. An upper limit for the critical aggregation concentration of UR is 10(-5) M as shown by H-1 NMR.
引用
收藏
页码:9309 / 9313
页数:5
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