A DFT conformational analysis and VCD study on methyl tetrahydrofuran-2-carboxylate
作者:Tom Kuppens、Koen Vandyck、Johan van der Eycken、Wouter Herrebout、Benjamin van der Veken、Patrick Bultinck
DOI:10.1016/j.saa.2006.07.034
日期:2007.6
basis set and the collection of nine functionals from above, the dipole and rotational strengths were calculated, and compared to experimental values which were extracted from the experimental IR and VCD spectra for (+)-(S)-methyl tetrahydrofuran-2-carboxylate. A detailed analysis on the agreement between experiment and simulated spectra was performed by assigning the experimental bands based on the
对(S)-四氢呋喃-2-羧酸甲酯进行了DFT计算,以促进IR和VCD光谱的解释。使用6-31G *基集与包括B1LYP,B3LYP,B3P86,B3PW91,B98,BHandH,BHandHLYP,MPW1PW91和PBE1PBE在内的不同密度功能组合,无法明确描述势能面。相反,使用cc-pVTZ基集可以找到统一的构象图。使用这个大的基础集并从上面收集九个功能,计算出偶极子和旋转强度,并将其与从(+)-(S)-甲基四氢呋喃-2的实验IR和VCD光谱中提取的实验值进行比较-羧酸盐。通过基于除BHandH以外的所有功能获得的谐波基波分配实验频带,对实验谱图和模拟谱图之间的一致性进行了详细分析,该谱图在整个生产线上表现不佳。评估偶极强度,所有经过测试的功能均表现良好。对于旋转强度,可以观察到差异:B3LYP,B1LYP和B98与实验的相关性最高,而PBE1PBE的相关性最低。使用邻域相似性度量