PROPERTIES OF MONOLAYERS OF NORMAL ALKYL BETAINES AT AIR-WATER INTERFACE

被引：5

作者：

EVANS, NG

PILPEL, N

机构：

[1] Department of Pharmacy, Chelsea College of Science, University of London, London, S.W. 3, Manresa Road

来源：

JOURNAL OF PHARMACEUTICAL SCIENCES | 1969年 / 58卷 / 10期

关键词：

Alkyl betaines; normal–monolayer at air‐water interface; Force‐area characteristics–normal alkyl betaine films; IR spectrophotometry–identity; pH; temperature effects–normal alkyl betaine films;

D O I：

10.1002/jps.2600581014

中图分类号：

R914 [药物化学];

学科分类号：

100701 ;

摘要：

A study has been made of the effects of pH and of temperature on insoluble films of N‐octadecyl and N‐behenyl NN‐dimethyl glycine at the air‐water interface. Condensation of the films at pH 4.5‐6 is ascribed to the formation of zwitterions but there is no indication at present that an anionic species is produced on alkaline substrates. The two compounds have entropies of spreading of 1.58 and 2.55 cal. deg.−1 cm.−2, respectively; their enthalpies of spreading are 4.11 and 6.94 kcal mole−1 cm.−2. The results suggest that there is intramolecular neutralization of charges between N+ and COO‐ groups in each molecule. Copyright © 1969 Wiley‐Liss, Inc., A Wiley Company

引用

页码：1228 / &

共 14 条

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