Effect of alkali metal ions on the pyrrole and pyridine π-electron systems in pyrrole-2-carboxylate and pyridine-2-carboxylate molecules: FT-IR, FT-Raman, NMR and theoretical studies
作者:G. Świderski、S. Wojtulewski、M. Kalinowska、R. Świsłocka、W. Lewandowski
DOI:10.1016/j.molstruc.2011.01.026
日期:2011.5
Abstract The FT-IR, FT-Raman and 1H and 13C NMR spectra of pyrrole-2-carboxylic acid (PCA) and lithium, sodium, potassium, rubidium and caesium pyrrole-2-carboxylates were recorded, assigned and compared in the Li → Na → K → Rb → Cs salt series. The effect of alkali metal ions on the electronic system of ligands was discussed. The obtained results were compared with previously reported ones for pyridine-2-carboxylic
摘要 吡咯-2-羧酸 (PCA) 和吡咯-2-羧酸锂、钠、钾、铷和铯的 FT-IR、FT-拉曼和 1H 和 13C NMR 光谱在 Li → Na → K → Rb → Cs 盐系列。讨论了碱金属离子对配体电子系统的影响。将所得结果与先前报道的吡啶-2-羧酸和碱金属吡啶-2-羧酸盐的结果进行比较。计算了 B3LYP/6-311++G** 水平的 pyrrole-2-羧酸和 Li, Na, K pyrrole-2-carboxylates 和 MP2/6-311++G** 水平的 Moller-Plesset 方法. 吡咯-2-羧酸 (PCA) 和锂、钠、还计算了吡咯-2-羧酸钾。使用统计方法(线性相关)、计算芳香性指数和Mulliken、NBO和ChelpG群体分析方法研究了Li→Cs系列中金属影响下配体芳香体系的扰动程度。此外,Bader 理论 (AIM) 用于设置键临界点的特征,这证实了碱金属对吡咯环的影响。