[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 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.
Mu
Jun-ze
JZ
Environmental Science Research Center, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China.
Huang
Gao-ling
GL
Zhang
Yong
Y
D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods; D008956:Models, Chemical; D015394:Molecular Structure; D009281:Naphthalenes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013696:Temperature; D047392:beta-Cyclodextrins / Q000737:chemistry*
D009281:Naphthalenes; D047392:beta-Cyclodextrins; C108222:alpha-bromonaphthalene