Synthesis, Conformational Analysis, Infrared, Raman and UV-Visible Spectra of Novel Schiff Bases compiled with DFT Calculations
作者:Samy M. Ahmed、Ibrahim A. Shaaban、Elsayed H. El-Mossalamy、Tarek A. Mohamed
DOI:10.2174/1386207323666200127161207
日期:2020.10.5
IR and Raman bands. Moreover, the electronic absorption spectra for the favored conformers were predicted in DMSO solution using TD-B3LYP/6-31G(d) calculations. Similarly, the 1H NMR chemical shifts were also estimated using GIAO approach implementing PCM including solvent effects (DMSO-d6). Conclusion: Proper interpretations of the observed electronic transition, chemical shifts, IR and Raman bands
目的:两个新的席夫碱命名为2-((2-羟基苄叉基)氨基)-4,5,6,7-四氢苯并[b]噻吩-3-腈(BESB1)和2-((呋喃-2-基亚甲基)合成了氨基)-4,5,6,7-四氢-苯并[b]噻吩-3-腈(BESB2)。 方法:根据CHN元素分析,中红外(400–4000 cm-1),拉曼(100-4000 cm-1),1H NMR,质量和UV-Vis光谱测量对结构进行表征。此外,对两个席夫碱均使用DFT-B3LYP方法在6-31G(d)基组上进行了量子力学计算。最初,我们对拟议的构象异构体进行了完整的几何优化,然后进行了频率计算。BESB1(AE)和BESB2(F–J)除了3D假设外,还基于CN和OH基团对偶氮甲碱孤对(NLP)的取向。 结果:计算结果偏向于BESB1的构象异构体A,其中C≡N和OH部分为NLP的顺式,而对于BSBSB2则优选构象异构体G(C≡N/呋喃-O为NLP的顺式/反