The excimer fluorescence of 2-methylnaphthalene in beta- and gamma-cyclodextrin aqueous solutions

被引：44

作者：

Hamai, S

机构：

[1] Department of Chemistry, College of Education, Akita University, Akita 010

来源：

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN | 1996年 / 69卷 / 03期

关键词：

D O I：

10.1246/bcsj.69.543

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

2-Methylnaphthalene (MN) exhibits MN excimer fluorescence in both beta-cyclodextrin (beta-CD) and gamma-cyclodextrin (gamma-CD) neutral aqueous solutions. beta-CD forms a 1:1 inclusion complex with MN, which self-associates to form a 2:2 inclusion complex emitting the MN excimer fluorescence. In 0.4 mol dm(-3) NaOH solutions, no excimer fluorescence has been observed, indicating that the 2:2 inclusion complex dissociates to two 1:1 inclusion complexes because of an electrostatic repulsion between the negatively charged hydroxy groups of the two beta-CD molecules contained in the 2:2 inclusion complex. For the gamma-CD-MN system as well as the beta-CD-MN system, the excimer fluorescence can be explained in terms of the formation of a 2:2 inclusion complex through a self-association of 1:1 inclusion complexes.

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页码：543 / 549

页数：7

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