Synthesis, photophysical and nonlinear optical properties of push–pull tetrazoles
作者:Anna-Kay West、Lukas J. Kaylor、Mahamud Subir、Sundeep Rayat
DOI:10.1039/d2ra04307f
日期:——
absorption band (λ 1) as the polarity increased. The fluorescence intensity of the title compounds was found to be solvent-dependent; however, no apparent correlation to solvent polarity could be established. The absorption and emission characteristics of 1a-d were also influenced by the nature of the substituent as 1d, bearing a strong electron donating 4-(N,N-diphenylamino)phenyl group, displayed a significant
以对硝基苯基和 3-吡啶基单元为受体 (1a) 的 2,5-二取代四唑,以及以对硝基苯基和苯基 (1b) 为受体的三个推挽式四唑,2-(二苯并[b,d] furan-4-yl) (1c) 和 4-(N,N-diphenylamino)phenyl (1d) 作为供体基团,是通过对硝基苯基四唑与适当取代的芳基硼酸的铜催化有氧 CN 偶联合成的。1a-c 的吸收和发射光谱对溶剂极性的依赖性很小;然而,在 1d 的情况下,随着极性的增加,最长吸收带 (λ 1) 出现蓝移。发现标题化合物的荧光强度与溶剂有关;然而,无法确定与溶剂极性的明显相关性。1a-d 的吸收和发射特性也受到取代基性质的影响,如 1d,具有强给电子 4-(N,N-二苯基氨基)苯基,也显示出显着的红移吸收 (λ 1)作为与其他化合物相比的发射(λem)波段。时间相关的密度泛函计算 (CAM-B3LYP/6-311++G**) 表明最长的波长带