Spectroscopic investigation, photophysical parameters and DFT calculations of 4,4′-(1E,1′E)-2,2′-(pyrazine-2,5-diyl)bis(ethene-2,1-diyl)bis(N,N-dimethylaniline) (PENDA) in different solvents
作者:Abdullah M. Asiri、Khalid A. Alamry、Mehboobali Pannipara、Abdullah G. Al-Sehemi、Samy A. El-Daly
DOI:10.1016/j.saa.2015.05.018
日期:2015.10
π-conjugated potential push–pull chromophore system 4,4′-(1E,1′E)-2,2′-(Pyrazine-2,5-diyl)bis(ethene-2,1-diyl)bis(N,N-dimethylaniline) (PENDA) has been carried out spectroscopically. The optical absorption and emission properties of this molecule have been studied in different solvents. The molecule PENDA shows strong solvatochromic emission upon changing the solvent polarity from nonpolar to polar; indicating
关于π的光物理的全面研究共轭电位推挽生色团体系4,4'-(1E,1'E)-2,2'-(吡嗪-2,5-二基)双(乙烯-2,1-二基)双(N,N -二甲基苯胺)(PENDA)已在光谱上进行。已经在不同溶剂中研究了该分子的光吸收和发射性质。当溶剂极性从非极性变为极性时,PENDA分子显示出很强的溶剂致变色发光。表明发射状态具有分子内电荷转移(ICT)特性。详细研究了溶剂对PENDA的单峰吸收,摩尔吸收率,振子强度,偶极矩和荧光量子产率等光谱性质的影响。利珀特-又贺和雷查德相关性被用于估计激发态和基态的偶极矩之间的差(Δ μ)。使用高斯09软件包分别使用密度泛函理论(DFT)和时变密度泛函理论(TDDFT)对基态和电子激发态进行了几何优化。(8×10的溶液-5 M)在彭达THF,二恶烷,CH 3 CN和CHCl 3通过氮激光脉冲时泵浦(给出激光发射λ EX 800皮秒的持续时间和1.48毫焦耳的脉冲能量的=