Investigating ESIPT and donor-acceptor substituent effects on the photophysical and electrochemical properties of fluorescent 3,5-diaryl-substituted 1-phenyl-2-pyrazolines
作者:Gabriel C. Santos、Inaiá O. Rocha、Felipe S. Stefanello、João P.P. Copetti、Isadora Tisoco、Marcos A.P. Martins、Nilo Zanatta、Clarissa P. Frizzo、Bernardo A. Iglesias、Helio G. Bonacorso
DOI:10.1016/j.saa.2021.120768
日期:2022.3
This paper describes the synthesis, structural study, and evaluation of electrochemical and photophysical properties by UV–Vis absorption and fluorescence emission analysis (solution and solid-state) of a series of eight 3,5-aryl-substituted 1-phenyl-2-pyrazolines (5), where 3-aryl = 2-OH-C6H4 (5a-g) or Ph (5h), and 5-aryl = Ph (a, h), 1-naphthyl (b), 4-Br-C6H4 (c), 4-F-C6H4 (d), 4-OCH3-C6H4(e), 4-NO2-C6H4
本文介绍了通过紫外-可见吸收和荧光发射分析(溶液和固态)对一系列 8 个 3,5-芳基取代的 1-苯基-2-吡唑啉 ( 5 ), 其中 3-芳基 = 2-OH-C 6 H 4 ( 5a-g ) 或 Ph ( 5h ), 5-芳基 = Ph ( a , h ), 1-萘基 ( b ), 4- Br-C 6 H 4 ( c )、4-FC 6 H 4 ( d )、4-OCH 3 -C 6 H 4 (e )、4-NO 2 -C 6 H 4 ( f )、4-(N(CH 3 ) 2 )-C 6 H 4 ( g)。在作为溶剂的 DCM、MeCN、AcOEt、EtOH 和 DMSO 中评估了 2-吡唑啉的 UV-Vis 吸收特性,并显示出极性非质子溶剂的荧光偏移。尽管未检测到激发态分子内质子 (ESIPT) 效应,但当在每种化合物的最低能量跃迁处激发时,稳态荧光发射在蓝色区域显示出一条带。与溶液测定相比,