Muttannavar V T, Melavanki Raveendra, Sharma Kalpana, Vaijayanthimala S, Shelar Vikas M, Patil S S, Naik L R
Department of Physics, JSS Science RSH PU College, Vidyagiri Dharwad, Karnataka, India.
Department of Physics, Ramaiah Institute of Technology Bangaluru, Karnataka, India.
Luminescence. 2019 Dec;34(8):924-932. doi: 10.1002/bio.3692. Epub 2019 Jul 22.
Fluorescence quenching and preferential solvation of a coumarin derivative, namely 3-[2-oxo-2-(2-oxo-2H-chromen-3-yl)-ethylidene]-1,3-dihydro-indol-2-one (3OCE), with aniline used as a quencher in solvent mixtures of acetonitrile (AN) and 1,4-dioxane (DX) was carried out at steady state. Suppan's theory of dielectric enrichment was used to understand the nonideality and dielectric enrichment in AN-DX solvent mixtures. The effect of viscosity and dielectric constant variation at room temperature were analyzed. Quenching was characterized using Stern-Volmer plots with an upward curvature. It was found that 3OCE underwent combined static and dynamic quenching that was evident from the quenching rate parameters.
在稳态条件下，以苯胺为猝灭剂，研究了香豆素衍生物3-[2-氧代-2-(2-氧代-2H-色烯-3-基)亚乙基]-1,3-二氢吲哚-2-酮(3OCE)在乙腈(AN)和1,4-二氧六环(DX)混合溶剂中的荧光猝灭和优先溶剂化现象。运用Suppan的介电富集理论来理解AN-DX混合溶剂中的非理想性和介电富集。分析了室温下粘度和介电常数变化的影响。通过具有向上曲率的Stern-Volmer图对猝灭进行了表征。从猝灭速率参数可以明显看出，3OCE经历了静态和动态的联合猝灭。
