Synthesis, characterisation, estimation of ground-and excited-state dipole moments using solvatochromic shift and theoretical studies of new iminocoumarin derivatives
作者:Amal Rabahi、Malika Makhloufi-Chebli、Sihem Zaater、Meziane Brahimi、Artur M.S. Silva、Baya Boutemeur
DOI:10.1016/j.molstruc.2018.12.105
日期:2019.4
Abstract The study on the fluorescence and UV–Vis absorption of some iminocoumarins at ambient temperature in several solvents showed a bathochromic shift with the increase of the solvent polarity. The use of the solvathochromic method allowed us to determine the dipole moment in both ground and excited states. The studied molecules exhibit much higher dipole moments in the excited state than in the
摘要 一些亚氨基香豆素在常温下在几种溶剂中的荧光和紫外-可见吸收研究表明,随着溶剂极性的增加,发生红移。溶剂光致变色方法的使用使我们能够确定基态和激发态的偶极矩。所研究的分子在激发态表现出比基态高得多的偶极矩,这可能是由于激发态 π 电子密度的重新分布使分子具有更高的偶极矩而更具极性。此外,还使用 B3LYP/6-311 + G (d,p) 理论水平在理论上估计了 HOMO-LUMO 差距;低能隙表明分子中最终发生了电荷转移相互作用,并决定了它们的发光特性。