Crystal structures, spectroscopic and theoretical study of novel Schiff bases of 2-(methylthiomethyl)anilines
作者:Temitope E. Olalekan、Isaiah A. Adejoro、Bernardus VanBrecht、Gareth M. Watkins
DOI:10.1016/j.saa.2014.12.018
日期:2015.3
band gaps, dipole moments and polarizability are discussed. Increase in electron density shifted the phenolic proton resonance to lower fields. The methoxy-substituted compound has a small dipole moment and subsequent large polarizability value. Highest polarity was indicated by the nitro compound which also showed high polarizability due to its larger size. The energy gaps obtained from ELUMO–HOMO
合成了由对甲氧基水杨醛和2-(甲硫基甲基)苯胺(被甲基,甲氧基,硝基取代)衍生的新席夫碱,并通过元素分析,FT-IR,NMR,电子光谱和量子化学计算进行了表征。两种化合物的X射线晶体学分析表明,固体结构通过分子内和分子间的H键得以稳定。讨论了酚氢和亚胺氮之间的OH⋯N相互作用对质子和碳NMR位移的影响,以及CH⋯O和CH⋯S接触的作用。键的长度和角度,1 H和13 C NMR数据,E LUMO – HOMO,化合物的偶极矩和极化率通过密度泛函理论DFT(B3LYP / 6-31G ∗∗) 方法。将实验几何参数和NMR位移与计算值进行比较,得出了很好的相关性。讨论了芳基环取代基(甲基,甲氧基和硝基)对所得化合物性质的电子影响,例如颜色,NMR位移,电子光谱以及计算出的能带隙,偶极矩和极化率。电子密度的增加将酚质子共振转移到较低的场。甲氧基取代的化合物的偶极矩小,随后的极化率值大。硝基化合物表