Vibrational and theoretical study of the 2′,6′-dimethoxyflavone cis-formic acid inclusion compound
作者:Laurence Vrielynck、Jean-Claude Wallet、Jean-Claude Merlin
DOI:10.1016/s1386-1425(00)00296-1
日期:2000.11
ABC structure of strong hydrogen bonded complexes. This ABC pattern corroborates previous X-ray crystallographic data showing that cis-formic acid is strongly hydrogen bonded to the flavonic compound. The inclusion complex is quite unstable and the infrared spectrum clearly shows that formic acid disappears after a period of a few months. In order to get some information on the stability criterions of
记录并分析了2',6'-二甲氧基黄酮及其与甲酸的1:1络合物的FT红外光谱和拉曼光谱。某些振动成分似乎是结晶样品中甲酸顺式-旋转异构体所特有的,尤其是CH基团拉伸振动特征。在3400-1900 cm(-1)范围内观察到并与氢键合的OH基团拉伸振动相关的广泛而强烈的红外吸收表现出强氢键合配合物的特征ABC结构。该ABC图案证实了先前的X射线晶体学数据,该数据表明顺式甲酸是氢键合至黄酮化合物的强氢键。包合物非常不稳定,红外光谱清楚地表明,几个月后甲酸消失了。为了获得有关分子间氢键配合物稳定性判据的一些信息,对半经验AM1计算进行了研究。对涉及甲酸的顺式和反式构象的螯合物的计算的络合热(deltacH)的比较表明,氢键络合与顺式旋转异构体的反应无疑得到了支持。