Bimolecular fluorescence quenching reactions of the biologically active coumarin composite 2-acetyl-3H-benzo[f]chromen-3-one in different solvents

被引：17
|
作者：
Koppal, V. V. [1 ]
Melavanki, R. M. [2 ]
Kusanur, R. A. [3 ]
Patil, N. R. [1 ]
机构：
[1] BVB Coll Engn & Technol, Dept Phys, Hubli 580031, Karnataka, India
[2] MS Ramaiah Inst Technol, Dept Phys, Bangalore, Karnataka, India
[3] RV Coll Engn, Dept Chem, Bangalore, Karnataka, India
来源：
LUMINESCENCE | 2018年 / 33卷 / 06期
关键词：
diffusion-limited reaction; fluorescence quenching; high polarity solvents; quenching models; Stern-Volmer relationship; DIFFUSION-CONTROLLED REACTIONS; STERN-VOLMER PLOTS; CARBON-TETRACHLORIDE; ANTIMICROBIAL ACTIVITY; ANILINE; MIXTURES; INDOLE; TEMPERATURE; DERIVATIVES; TRANSIENT;
D O I：
10.1002/bio.3502
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A study on fluorescence quenching was carried out for the coumarin derivative 2-acetyl-3H-benzo[f]chromen-3-one (2AHBC) with aniline at room temperature. Efficient fluorescence quenching was observed and Stern-Volmer (S-V) plots showed upward curves from linearity in all solvents of different polarities. For the solute 2AHBC, ground state complex formation does not hold in our study. The kinetic distance (r) value was found to be greater than the encounter distance (R) and indicated that the quenching reaction was held within the sphere of action. Diffusion-limited reactions were found to be more prominent in high polarity solvents, namely dimethyl sulfoxide (DMSO), DMF, ACN, methanol, ethanol, propanol and DCM. The relationships between quenching constant (K-SV) and dielectric constants (epsilon) of the different solvents were studied.
引用
收藏
页码：1019 / 1025
页数：7
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