Dynamic behavior of anionic binuclear helicate- and meso-helicate-type coordination compounds

被引:30
作者
Albrecht, M
Schneider, M
Rottele, H
机构
[1] Institut für Organische Chemie, Universität Karlsruhe, D-76131 Karlsruhe, Richard-Willstätter-Allee
来源
CHEMISCHE BERICHTE-RECUEIL | 1997年 / 130卷 / 05期
关键词
self-assembly; NMR spectroscopy; titanium; catechol ligands; helical structures;
D O I
10.1002/cber.19971300512
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The racemization/symmetrization of helicate- or meso-helicate-type dinuclear titanium(IV) complexes M-n[(ligand)(3)Ti-2] (n = 4: M = Li, Na, K, Cs; n = 2: M = Ca, Sr), which are formed by metal-directed self-assembly of alkyl-bridged bis(catecholate) ligands in the presence of basic alkali-metal or alkaline-earth metal salts, can be monitored by dynamic NMR spectroscopy. The free-energy barrier (Delta G(not equal)) of this process is influenced by the nature of the ligand, the solvent, and the counterion.
引用
收藏
页码:615 / 619
页数:5
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