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

页码：615 / 619

页数：5