Preparation, Mechanism, and Supramolecular Structure Study of a Novel Benzimidazole-Hydrate
作者:Yong Hong、Jing-Yi Xiao、Ke-Long Huang、Jin-Gang Yu、Du-Shu Huang
DOI:10.1007/s10870-010-9694-x
日期:2010.6
A novel bis[2-(2-chloro-4-fluorophenyl)-1H-Benzimidazole]-hydrate was prepared from Schiff base, and its single crystalline was obtained. The single crystalline was characterized by X-ray crystallography, and the results shows that the title complex belongs to the triclinic system, space group (P1) with lattice parameters a = 7.592(2) Å, b = 7.595(2) Å, c = 11.886 (3) Å, V = 574(3) Å3, Mr = 352.33, Dc = 1.478 g/cm3, μ(MoKα) = 0.33 mm−1, F(000) = 262, Z = 1, the final R = 0.090 and wR = 0.209 for 2,315 observed reflections (I > 2σ(I)). The crystal structure is formed by two benzimidazole molecules which are linked by a water molecule. A UV–Vis spectrophotometer and a fluorophotometer were used to detect the benzimizadole-hydrate crystal transformation process, which shows that benzimidazole-hydrate can only be formed from Schiff base effectively when ortho-hydroxyl group does not exist in benzaldehyde. The synthesis mechanism was also discussed. Compared with its Schiff base, benzimidazole-hydrate displays stronger fluorescence. A novel bis[2-(2-chloro-4-fluorophenyl)-1H-Benzimidazole]-hydrate was prepared, and its single crystalline was obtained and characterized. Its synthesis mechanism was also discussed briefly.
以希夫碱为原料制备了一种新型双[2-(2-氯-4-氟苯基)-1H-苯并咪唑]水合物,并获得了其单晶。用 X 射线晶体学方法对单晶进行了表征,结果表明标题配合物属于三菱系,空间群(P1),晶格参数 a = 7.592(2) Å, b = 7.595(2) Å, c = 11.886 (3) Å, V = 574(3) Å3, Mr = 352.33, Dc = 1.478 g/cm3, μ(MoKα) = 0.33 mm-1,F(000) = 262,Z = 1,最终 R = 0.090,wR = 0.209,观察到 2315 个反射(I > 2σ(I))。晶体结构由两个苯并咪唑分子和一个水分子连接而成。利用紫外可见分光光度计和荧光光度计检测了苯并咪唑-水合物晶体的转化过程,结果表明只有当苯甲醛中不存在正羟基时,苯并咪唑-水合物才能有效地由希夫碱形成。此外,还讨论了合成机理。与希夫碱相比,苯并咪唑水合物显示出更强的荧光。制备了一种新型的双[2-(2-氯-4-氟苯基)-1H-苯并咪唑]水合物,并获得了其单晶,对其合成机制进行了简要讨论。并对其合成机理进行了简要讨论。