STRUCTURAL-CHANGES IN THE COMPLEXATION OF BENZO-CROWN ETHERS - NOESY AND VARIABLE-TEMPERATURE C-13 NMR-STUDY

被引：13
|
作者：
MARIAPPAN, SVS [1 ]
GOMATHI, L [1 ]
SUBRAMANIAN, S [1 ]
机构：
[1] INDIAN INST TECHNOL,REG SOPHISTICATED INSTRUMENTAT CTR,MADRAS 600036,TAMIL NADU,INDIA
来源：
MAGNETIC RESONANCE IN CHEMISTRY | 1991年 / 29卷 / 07期
关键词：
BENZO-CROWN ETHERS; NOESY AND VARIABLE-TEMPERATURE C-13 NMR; COMPLEXATION;
D O I：
10.1002/mrc.1260290704
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The structural changes during the complexation of benzo-crown ethers with Cs+, K+ and Na+ were studied by NOESY and variable-temperature C-13 NMR spectroscopy. It was found that, on complexation, the distance between the CH-alpha and 1-CH2 is reduced in dibenzo-24-crown-8 (DB24C8), dibenzo-18-crown-6 and benzo-15-crown-5. Two mechanisms have been proposed for the distance reduction, the fluttering motion of the benzo group and the elongation of the crown moiety. However, it is concluded that both of these mechanisms seem to play a role in the distance reduction. In the complexed state of DB24C8 with Cs+, Cs+ is predicted to be slightly above the plane of the crown oxygens with respect to DB24C8.
引用
收藏
页码：656 / 666
页数：11
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