Pushpam S, Gayathri S, Ramakrishnan V
Department of Laser Studies, School of Physics, Madurai Kamaraj University, Madurai 625021, India.
Department of Laser Studies, School of Physics, Madurai Kamaraj University, Madurai 625021, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Dec 10;133:80-6. doi: 10.1016/j.saa.2014.04.167. Epub 2014 May 9.
Schiff base derivative synthesized by the reaction of 2-(methylthio) aniline and 2-hydroxy-1-naphthaldehyde exhibits keto-amine tautomerism in methanol solvent. The fluorescence quenching of N-(2-methyl thiophenyl)-2-hydroxy-1-naphthadiamine (NMTHN) by TiO2 nanoparticles in methanol has been studied. The excitation and emission peaks have been observed at 439 and 509nm respectively. The apparent association constant has been deduced from the absorption spectral changes of NMTHN-TiO2 nanoparticles using Bensi-Hildebrand equation. The number of binding sites and the binding constant have been calculated from the relevant fluorescence data. Quenching of fluorescence of NMTHN by TiO2 could be due to a dynamic mode. Density Functional Theory (DFT) calculations also have been performed to study the charge distribution of NMTHN-TiO2 both in ground and excited states. The HOMO-LUMO analysis of NMTHN-TiO2 in the ground state has been made.
由2-（甲硫基）苯胺与2-羟基-1-萘甲醛反应合成的席夫碱衍生物在甲醇溶剂中表现出酮胺互变异构现象。研究了甲醇中TiO2纳米颗粒对N-（2-甲基硫苯基）-2-羟基-1-萘二胺（NMTHN）的荧光猝灭。分别在439nm和509nm处观察到激发峰和发射峰。利用Bensi-Hildebrand方程从NMTHN-TiO2纳米颗粒的吸收光谱变化推导出表观缔合常数。根据相关荧光数据计算了结合位点数量和结合常数。TiO2对NMTHN荧光的猝灭可能是由于动态模式。还进行了密度泛函理论（DFT）计算，以研究NMTHN-TiO2在基态和激发态的电荷分布。对基态下NMTHN-TiO2进行了HOMO-LUMO分析。
