Quenching of the fluorescence of ENCDTTC by aniline and carbon tetrachloride in different organic solvents

被引:19
|
作者
Patil, N. R. [1 ]
Melavanki, R. M. [2 ]
Nagaraja, D. [3 ]
Patil, H. D. [4 ]
Sanningannavar, F. M. [5 ]
Kapatakar, S. B. [1 ]
机构
[1] B V B Coll Engn & Technol, Dept Phys, Hubli 580031, Karnataka, India
[2] M S Ramaiah Inst Technol, Dept Phys, Bangalore 560054, Karnataka, India
[3] Bangalore Inst Technol, Dept Phys, Bangalore 560004, Karnataka, India
[4] Basaveshwar Sci Coll, Dept Phys, Bagalkot 587101, Karnataka, India
[5] Karnatak Sci Coll, Dept Phys, Dharwad 580003, Karnataka, India
关键词
Fluorescence quenching; ENCDTTC; Diffusion limited; Static quenching; Dynamic quenching; Finite sink approximation model; DIFFUSION-CONTROLLED REACTIONS; STATE DIPOLE-MOMENTS; STERN-VOLMER PLOTS; S-V PLOTS; SOLVATOCHROMIC METHOD; COUMARINS; TRANSIENT; MICELLES; INDOLE;
D O I
10.1016/j.molliq.2013.01.006
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The fluorescence quenching studies of carboxamide namely (E)-N-(3-Chlorophenyl)-2-(3,4-dimethoxybenzylideneamino)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide [ENCDTTC] by aniline and carbon tetrachloride in six different solvents namely toluene, cyclohexane, n-hexane, n-heptane, n-decane and n-pentane have been carried out at room temperature with a view to understand the quenching mechanisms. The Stern-Volmer (S-V) plots have been found to be nonlinear with a positive deviation for all the solvents studied. In order to interpret these results we have invoked the ground state complex formation and sphere of action static quenching models. Using these models various quenching rate parameters have been determined. The magnitudes of these parameters suggest that sphere of action static quenching model agrees well with the experimental results. Hence the positive deviation is attributed to the static and dynamic quenching. Further, with the use of Finite Sink approximation model, it was possible to check these bimolecular reactions as diffusion-limited and to estimate independently distance parameter R' and mutual diffusion coefficient D. Finally an effort has been made to correlate the values of R' and D with the values of the encounter distance R and the mutual coefficient D determined using the Edward's empirical relation and Stokes Einstein relation. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:112 / 120
页数:9
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