Conformational changes of pyrene-labeled polyelectrolytes with pH: Effect of hydrophobic modifications

被引：24

作者：

Deo, P

Deo, N

Somasundaran, P ^{[1
]}

Jockusch, S

Turro, NJ

机构：

[1] Columbia Univ, Langmuir Ctr Colloids & Interfaces, NSF, IUCR Ctr Adv Studies Novel Surfactants, New York, NY 10027 USA

[2] Columbia Univ, Dept Chem, New York, NY 10027 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2005年 / 109卷 / 44期

关键词：

D O I：

10.1021/jp051743f

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：

Structural changes of pyrene-labeled and unlabeled poly(maleic acid/octyl vinyl ether) (PMAOVE) and poly(maleic acid/methyl vinyl ether) (PMAMVE) with changes in pH have been investigated in this study. The changes in the photophysical properties of pyrene are interpreted to investigate uncoiling or swelling of the polymeric chains with pH. The vibrational fine structure of the pyrene fluorescence (I-3/I-1) and the ratio between excimer and monomer fluorescence (I-e/I-m) of both pyrene-labeled and unlabeled PMAMVE and PMAOVE suggest that, at pH 4, the polymers are in the coiled form and PMAOVE forms hydrophobic nanodomains. An increase in pH ionizes a number of COOH groups on both PMAMVE and PMAOVE, which leads to the stretching or swelling of the polymers.

引用

页码：20714 / 20718

页数：5

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