Studies on the effects of steric hindrance of guest molecule on the formation of inclusion complexes by molecular luminescence

Fluorescence and room temperature phosphoresce (CD-RTP) induced by cyclodextrin methods were employed to investigate the effects of steric hindrance of guest molecule on the formation of inclusion complexes of beta-cylcodextrin (beta-CD) and bromonaphthalene (BrN). It has been found that the RTP int...

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Bibliographic Details
Published inGuang pu xue yu guang pu fen xi Vol. 25; no. 2; p. 188
Main Authors Mu, Jun-ze, Huang, Gao-ling, Zhang, Yong
Format Journal Article
LanguageChinese
Published China 01.02.2005
Subjects
beta-Cyclodextrins - chemistry
Hydrogen-Ion Concentration
Kinetics
Luminescence
Luminescent Measurements - methods
Models, Chemical
Molecular Structure
Naphthalenes - chemistry
Spectrometry, Fluorescence
Temperature
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Summary:Fluorescence and room temperature phosphoresce (CD-RTP) induced by cyclodextrin methods were employed to investigate the effects of steric hindrance of guest molecule on the formation of inclusion complexes of beta-cylcodextrin (beta-CD) and bromonaphthalene (BrN). It has been found that the RTP intensity of 2-BrN/beta-CD/n-Bu/ph was less than one third of that of 1-BrN/beta-CD/n-Bu/ph and fluorescence emission spectra of 2-BrN/beta-CD/n-Bu/ph had a red shift of 5-10 nm comparing with that of 1-BrN/beta-CD/n-Bu/ph under the optimum experimental conditions, respectively. These results exhibited that the steric locations of bromine in BrN strongly influenced the formation of inclusion complexes. The determination of the two quadri-inclusion complexes constants further demonstrated that the steric hindrance has a great effect on the formation of inclusion complexes. According to the above experimental results, the mechanism of formation of inclusion complexes were discussed briefly.
ISSN:1000-0593