化学
取代基
分子内力
溶剂效应
计算化学
溶剂变色
密度泛函理论
从头算
光化学
溶剂
有机化学
作者
Milica Rančić,Ivana Stojiljković,Maja Milošević,Nevena Ž. Prlainović,M. Jovanović,Miloš K. Milčić,Aleksandar D. Marinković
标识
DOI:10.1016/j.arabjc.2016.12.013
摘要
Abstract The substituent and solvent effect on intramolecular charge transfer (ICT) in 5-arylidene-3-methyl-2,4-thiazolidinediones (series 1 ) and 5-arylidene-3-phenyl-2,4-thiazolidinediones (series 2 ) was studied by using experimental and theoretical methodology. The effect of specific and non-specific solvent–solute interactions on the UV–vis absorption maxima shifts was evaluated by using the Kamlet-Taft and Catalan solvent parameter sets. Linear free energy relationships (LFERs) have been applied to the UV–vis and 13 C NMR data by using SSP (single substituent parameter) and DSP (dual substituent parameters). Comparative LFER analysis of 10 styrenic series was performed in order to distinguish contribution of structural and electronic substituent effect on extent of π-polarization in a side chain (vinyl) group. Furthermore, the experimental findings were interpreted with the aid of ab initio MP2 and time-dependent density functional (TD-DFT) methods. TD-DFT calculations are performed to quantify the efficiency of intramolecular charge transfer (ICT) allowing us to define the charge-transfer distance (D CT ), amount of transferred charge (Q CT ), and difference of dipole moments between the ground and excited states (μ CT ). It was found that both substituents and solvents influence electron density shift, i.e . extent of conjugation, and affect intramolecular charge transfer character in the course of excitation.
科研通智能强力驱动
Strongly Powered by AbleSci AI