Studies on the Effects of Steric Hindrance of Guest Molecule onthe Formation of Inclusion Complexes by Molecular Luminescence
- 海洋环境－已发表论文 
利用分子发光法研究了正丁醇(nbutanol,nBu)和苯酚(phenol,ph)存在下空间位阻效应对β环糊精(Cyclodextrin,βCD)和溴代萘(Bromonaphthalene,BrN)包络物形成的影响。在各自最佳实验条件下,2BrN/βCD/nBu/ph体系的室温磷光(RTP)强度不及1BrN/βCD/nBu/ph体系的三分之一;而其荧光发射光谱较1BrN/βCD/nBu/ph发射光谱红移5～10nm,表明BrN中溴的空间位置对包络物的形成有显著的影响。两四元体系包络常数(Kf)的测定结果也进一步说明这一点。据此,讨论了上述包络物的形成机理。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 β-cylcodextrin(β-CD) and bromonaphthalene(BrN). It has been found that the RTP intensity of 2-BrN/β-CD/n-Bu/ph was less than one third of that of 1-BrN/β-CD/n-Bu/ph and fluorescence emission spectra of 2-BrN/β-CD/n-Bu/ph had a red shift of 5-10 nm comparing with that of 1-BrN/β-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.