Two novel Schiff bases derived from indole and biphenyl have been designed and synthesized, namely 3-((E)-(E)-[1-(biphenyl-4-yl)ethylidene]hydrazinylidene}methyl)-1-methyl-1H-indole (3-BEHMI) acetonitrile monosolvate, C24H21N3·CH3CN, and 3-((E)-(E)-[1-(biphenyl-4-yl)ethylidene]hydrazinylidene}methyl)-1-methyl-1H-indole (3-BEHEI) acetonitrile monosolvate, C24H21N3·CH3CN. Their structures were characterized by elemental analysis, quadrupole time-of-flight MS, NMR and UV–Vis spectroscopy. The single-crystal packing structure of3-BEHMIis largely dominated by C—H...π interactions and weak van der Waals interactions. Thein vitrocytotoxicity of the two title compounds have been evaluated against two tumour cell lines (A549 human lung cancer and 4T1mouse breast cancer) and two normal cell lines (MRC-5 normal lung cells and NIH 3T3 fibroblasts) by MTT assay. The results indicate that3-BEHEIexhibits a slightly weaker antiproliferative capability (IC50= ∼50 µM) than the previously reported similar Schiff base3-BEHI(IC50 = ∼20 µM). This is in line with docking results.3-BEHMIdemonstrates a weak cytotoxic activity, with IC50values around 110 µM, which disagrees with its docking results. Overall, the tested compounds manifest relevant cytotoxicities on the selected cancer cell lines and normal cell lines. The UV–Vis and fluorescence spectra were recorded and reproduced through the TD-DFT method with four types of hybrid density functionals, including B3LYP, M062X, PBE1PBE and WB97XD.
设计并合成了由吲哚和联苯衍生的两种新型希夫碱,即 3-((E)-(E)-[1-(联苯-4-基)亚乙基]亚肼}甲基)-1-甲基-1H-吲哚(3-BEHMI)乙腈单溶酯、和 3-((E)-(E)-[1-(联苯-4-基)亚乙基]肼亚基}甲基)-1-甲基-1H-吲哚(3-BEHEI)乙腈单溶酯,C24H21N3-CH3CN。通过元素分析、四极杆飞行时间质谱、核磁共振和紫外可见光谱对它们的结构进行了表征。3-BEHMI 的单晶堆积结构主要由 C-H...π 相互作用和微弱的范德华相互作用所主导。通过 MTT 试验评估了两种标题化合物对两种肿瘤细胞系(A549 人肺癌和 4T1 小鼠乳腺癌)和两种正常细胞系(MRC-5 正常肺细胞和 NIH 3T3 成纤维细胞)的体外毒性。结果表明,3-BEHEI 的抗增殖能力(IC50=∼50 µM)略弱于之前报道的类似席夫碱 3-BEHI(IC50=∼20 µM)。3-BEHMI 显示出较弱的细胞毒性活性,IC50 值约为 110 µM,这与其对接结果不符。总之,受试化合物对所选的癌细胞系和正常细胞系都具有相关的细胞毒性。利用四种混合密度函数(包括 B3LYP、M062X、PBE1PBE 和 WB97XD)通过 TD-DFT 方法记录和再现了紫外可见光谱和荧光光谱。