Two chalcones were synthesized by the aldolic condensation of enolizable aromatic ketones with substituted benzaldehydes under Claisen–Schmidt reaction conditions and then treated with 2,4-dinitrophenylhydrazine to yield their corresponding hydrazones. The two (E,Z)-2,4-dinitrophenylhydrazone structures, namely (Z)-1-(2,4-dinitrophenyl)-2-[(E)-3-(4-methylphenyl)-1-phenylallylidene]hydrazine, C22H18N4O4, (H1), and (Z)-1-[(E)-3-(4-chlorophenyl)-1-(naphthalen-1-yl)allylidene]-2-(2,4-dinitrophenyl)hydrazine, C25H17ClN4O4, (H2), were isolated by recrystallization and characterized by FT–IR, UV–Vis, single-crystal and powder X-ray diffraction methods. The UV–Vis spectra of the hydrazones have been studied in two organic solvents of different polarity. It was found that (H2) has a molar extinction coefficient larger than 40000. Single-crystal X-ray diffraction analysis reveals that the molecular zigzag chains of (H1) and (H2) are interconnected through noncovalent contacts. A quantitative analysis of the intermolecular interactions in the crystal structures has been performed using Hirshfeld surface analysis. All the synthesized chalcones and hydrazones were evaluated for their antibacterial and antioxidant activities. Results indicate that the studied compounds show significant activity against Gram negativeEscherichia colistrain and the chalcone 3-(4-methylphenyl)-1-phenylprop-2-en-1-one, (C1), was the most effective. In addition, only hydrazone (H1) displayed a moderate DPPH (2,2-diphenyl-1-picryl hydrazyl) scavenging efficiency.
在克莱森-施密特反应条件下,通过可烯化的芳香酮与取代的苯甲醛的醛缩合合成了两种查耳酮,然后用 2,4-二硝基苯肼处理生成了相应的肼。两种(E,Z)-2,4-二硝基苯腙结构,即(Z)-1-(2,4-二硝基苯基)-2-[(E)-3-(4-甲基苯基)-1-苯基烯丙基]肼,C22H18N4O4,(H1)和(Z)-1-[(E)-3-(4-氯苯基)-1-(萘-1-基)烯丙基]-2-(2、通过重结晶分离出了 C25H17ClN4O4(H2)-1-[(E)-3-(4-氯苯基)-1-(萘-1-基)烯丙基]-2-(2, 4-二硝基苯基)肼,并通过傅立叶变换红外光谱、紫外可见光谱、单晶和粉末 X 射线衍射方法对其进行了表征。在两种不同极性的有机溶剂中研究了肼酮的紫外可见光谱。研究发现,(H2) 的摩尔消光系数大于 40000。单晶 X 射线衍射分析表明,(H1) 和 (H2) 的分子之字链通过非共价接触相互连接。利用 Hirshfeld 表面分析法对晶体结构中的分子间相互作用进行了定量分析。对所有合成的查耳酮和酰肼进行了抗菌和抗氧化活性评估。结果表明,所研究的化合物对革兰氏阴性大肠埃希氏菌(Gram negativeEscherichia colistrain)具有显著的活性,其中查尔酮 3-(4-甲基苯基)-1-苯基丙-2-烯-1-酮(C1)的抗菌效果最好。此外,只有腙(H1)显示出中等程度的 DPPH(2,2-二苯基-1-苦基肼)清除效率。