Koppal V V, Melavanki R M, Kusanur R A, Patil N R
Department of Physics, B.V.B. College of Engineering and Technology, Hubli, Karnataka, India.
Department of Physics, M.S. Ramaiah Institute of Technology, Bangalore, Karnataka, India.
Luminescence. 2018 Sep;33(6):1019-1025. doi: 10.1002/bio.3502. Epub 2018 Jun 19.
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 ) and dielectric constants (ε) of the different solvents were studied.
在室温下，对香豆素衍生物2-乙酰基-3H-苯并[f]色烯-3-酮（2AHBC）与苯胺进行了荧光猝灭研究。观察到了有效的荧光猝灭，并且斯特恩-沃尔默（S-V）图在不同极性的所有溶剂中均显示出偏离线性的向上曲线。对于溶质2AHBC，在我们的研究中不存在基态复合物形成。发现动力学距离（r）值大于相遇距离（R），这表明猝灭反应发生在作用球内。发现扩散受限反应在高极性溶剂中更为显著，即二甲基亚砜（DMSO）、N，N-二甲基甲酰胺（DMF）、乙腈（ACN）、甲醇、乙醇、丙醇和二氯甲烷（DCM）。研究了不同溶剂的猝灭常数（K）与介电常数（ε）之间的关系。
