Static and dynamic quenching of biologically active coumarin derivative by aniline in benzene-acetonitrile mixtures

被引:50
作者
Evale, Basavaraj G. [2 ]
Hanagodimath, S. M. [1 ]
机构
[1] Gulbarga Univ, Dept Phys, Gulbarga 585106, Karnataka, India
[2] Sharanabasaveshwar Coll Sci, Gulbarga 585106, Karnataka, India
关键词
Quenching; Stern-Volmer constant; Charge-transfer; Diffusion-limited; DIFFUSION-CONTROLLED REACTIONS; STERN-VOLMER PLOTS; CARBON-TETRACHLORIDE; ELECTRON-TRANSFER; AROMATIC-AMINES; AQUEOUS-SOLUTIONS; DIPOLE-MOMENTS; REACTION-RATES; HALIDE-IONS; FLUORESCENCE;
D O I
10.1016/j.jlumin.2010.03.011
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The fluorescence quenching of coumarin derivative, 4-(5-chloro-3-furan-2-yl-benzofuran-2-yl)-6-methyl-2H-chromen-2-one (CIFBMC), in the presence of aniline in different proportion of benzeneacetonitrile mixture was studied by means of steady-state measurement (296 K). The quenching process was characterized by Stern-Volmer (S-V) plots, which display positive (upward) deviation. The positive deviation from linearity suggests that the quenching is due to the simultaneous presence of dynamic and static quenching, which is interpreted in terms of the ground-state complex formation and the sphere of action static quenching model. The sphere of action static quenching model agrees very well with experimental results. Further with the use of finite sink approximation model, it is concluded that the bimolecular quenching reactions are diffusion-limited. Various rate parameters for the fluorescence quenching process have been determined. The value of quenching constant kg increases with increase in dielectric constant of the mixed solvent, suggesting the charge transfer character of the excited complex. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:1330 / 1337
页数:8
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