Conformational and vibrational analysis of 18-crown-6–alkali metal cation complexes
作者:A.A. Al-Kahtani、N.A. Al-Jallal、A.A. El-Azhary
DOI:10.1016/j.saa.2014.04.170
日期:2014.11
Conformational analysis was performed for the 18-crown-6–alkali metal cation complexes, 18c6–AMCCs, using the CONFLEX method. The number of predicted conformations of the 18c6–Li+, Na+, K+, Rb+ and Cs+ complexes was 10, 24, 15, 9 and 4 conformations, respectively. Electronic and geometrical structures were calculated for the predicted conformations at the HF, B3LYP, CAM-B3LYP, M06 and MP2 levels. Binding
使用CONFLEX方法对18-冠-6-碱金属阳离子复合物18c6-AMCC进行了构象分析。18c6-Li +,Na +,K +,Rb +和Cs +的预测构象数复合体分别为10、24、15、9和4个构象。计算了HF,B3LYP,CAM-B3LYP,M06和MP2水平的预测构象的电子和几何结构。还计算了基态构象的结合能和焓。测量了游离18c6和18c6-AMCC的振动,红外和拉曼光谱。使用B3LYP力场的多比例因子缩放计算的振动频率与实验振动频率之间的比较预测,D 3 d,C 3 v和C 3中存在18c6–K +,Rb +和Cs +配合物v构象。也有人预测18c6–Na +复合物以D 3 d样构象存在。无法确定18c6–Li +配合物的构象是什么。