作者:Qiuju Yin、Yujie Chen、Meng Zhou、Xiangsheng Jiang、Junjun Wu、Yang Sun
DOI:10.1016/j.saa.2018.06.016
日期:2018.11
(5-methyl-1-phenylpyridin-2-one, PFD), the methyl-deuterated version of pirfenidone via the substitution of hydrogen (H) at C-5 by its isotope deuterium (D, 5D-PFD) was synthesized and its photophysical properties were investigated. The negative solvatochrom was observed in absorption and fluorescence spectra with increasing solvent polarity, which implied that intermolecular charge transfer (ICT) involved
为了改善吡非尼酮(5-甲基-1-苯基吡啶-2--2-酮,PFD)的代谢,通过在C-5处将氢(H)换成同位素氘(D,合成了5D-PFD),并对其光物理性质进行了研究。随着溶剂极性的增加,在吸收光谱和荧光光谱中观察到了负溶剂溶剂色谱,这表明分子间电荷转移(ICT)涉及n → π*PFD和5D-PFD的过渡。PFD的基态和激发态偶极矩分别计算为5.30 D和3.30 D,5D-PFD分别为3.70 D和2.18 D,这表明相比于激发态,PFD在基态下的极性更强使用5D-PFD。密度泛函理论(DFT)结果表明,从电子给体,甲基和羰基到作为电子给体的胺基,ICT的发展趋势十分明显。金属离子与PFD或5D-PFD的结合导致π → π *跃迁的红移和n → π的蓝移*跃迁,分别表明吡啶酮环在未占据的金属离子轨道与氧原子的孤对电子结合后显示出更高的稳定性,从而促进了电子在苯基单元上的分布。添加