ULTRASONIC-ABSORPTION STUDIES IN AQUEOUS-SOLUTIONS OF MODIFIED BETA-CYCLODEXTRINS

被引：13
作者：
JOBE, DJ
VERRALL, RE
REINSBOROUGH, VC
机构：
[1] MT ALLISON UNIV, DEPT CHEM, SACKVILLE E0A 3C0, NB, CANADA
[2] UNIV SASKATCHEWAN, DEPT CHEM, SASKATOON S7N 0W0, SASKATCHEWAN, CANADA
来源：
CANADIAN JOURNAL OF CHEMISTRY | 1990年 / 68卷 / 12期
关键词：
ULTRASONIC ABSORPTION; MODIFIED BETA-CYCLODEXTRINS; SURFACTANT INCLUSION; RELAXATION FREQUENCY;
D O I：
10.1139/v90-327
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Ultrasonic absorption studies over the frequency range 0.6-210 MHz were conducted in aqueous solutions of the following modified beta-cyclodextrins (beta-CD): 2,6-O-dimethyl-beta-CD(DM-beta-CD), 2,3,6-O-trimethyl-beta-CD (TM-beta-CD), and hydroxypropyl-beta-CD (HP-beta-CD). Anomalous ultrasonic absorption found in the three systems was attributed to three relaxations in the DM-beta-CD and HP-beta-CD systems and two in the TM-beta-CD system. These relaxations were assigned to hydrogen bond "wig-wagging", to CD cavity water exchange, and to bond rotation within the CD units. The 1:1 DM-beta-CD/decyltrimethylammonium bromide system was also investigated ultrasonically in solution.
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页码：2131 / 2136
页数：6
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