Spectroscopic Studies and Crystal Structure of (Z)-6-[(2-hydroxyphenylamino)methylene]-2-methoxycyclohexa-2,4-dienone
作者:Hüseyin Ünver、Mustafa Yıldız、Aşkın Kiraz、Özen Özgen
DOI:10.1007/s10870-008-9412-0
日期:2009.1
The Schiff base (Z)-6-[(2-hydroxyphenylamino)methylene]-2-methoxycyclohexa-2,4-dienone has been synthesized from the reaction of 2-aminophenol with 2-hydroxy-3-methoxybenzaldehyde. The title compound has been characterized by elemental analysis, FT-IR, 1H-NMR, 13C-NMR and UV–Visible techniques. The structure of the title compound also was determined crystallographically. The crystal structure has been solved by direct methods and refined by full-matrix least squares. The title compound crystallize in the monoclinic space group P21/c with a = 10.438(1), b = 8.851(1), c = 12.746(1) Å, β = 95.72(1)°, V = 1171.7(2) Å3, D x = 1.379 g cm−3, respectively (R1 = 0.0522 and wR2 = 0.126 for 1442 reflections [I > 2σ(I)]). N-salicylideneaniline derivatives have been shown to exist as tautomeric forms due to intramolecular proton shifts between the phenol-oxygen and the imine-nitrogen, via intramolecular hydrogen bonding O–H···N or O···H–N.
希夫碱 (Z)-6-[(2-hydroxyphenylamino)methylene]-2-methoxycyclohexa-2,4-dienone 是由 2-aminophenol 与 2-hydroxy-3-methoxybenzaldehyde 反应合成的。通过元素分析、傅立叶变换红外光谱、1H-NMR、13C-NMR 和紫外-可见光谱技术对标题化合物进行了表征。标题化合物的结构也在晶体学上得到了确定。晶体结构已通过直接法求解,并通过全矩阵最小二乘法精炼。标题化合物在单斜空间群 P21/c 中结晶,a = 10.438(1), b = 8.851(1), c = 12.746(1) Å, β = 95.72(1)°, V = 1171.7(2) Å3, D x = 1.379 g cm-3, respectively (R1 = 0.0522 and wR2 = 0.126 for 1442 reflections [I > 2σ(I)]).由于分子内质子在酚氧和亚胺氮之间发生位移,通过分子内氢键 O-H-N 或 O-H-N,N-水杨酰苯胺衍生物被证明以同分异构形式存在。