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

共 32 条

[1] Albrecht, 1996, ANGEW CHEM, V108, P1299
[2] Albrecht M, 1996, SYNLETT, P565
[3] Self-assembly of a triple-stranded meso-helicate from two iron(II) ions and three [CH2](3)-bridged bis(2,2'-bipyridine) ligands
Albrecht, M
Riether, C
[J]. CHEMISCHE BERICHTE, 1996, 129 (07) : 829 - 832
[4] Stabilization of an unusual coordination geometry at Li+ in the interior of a cryptand-type helicate
Albrecht, M
Kotila, S
[J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1996, 35 (11): : 1208 - 1210
[5] FORMATION OF A MESO-HELICATE BY SELF-ASSEMBLY OF 3 BIS(CATECHOLATE) LIGANDS AND 2 TITANIUM(IV) IONS
ALBRECHT, M
KOTILA, S
[J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1995, 34 (19): : 2134 - 2137
[6] Linear (CH2)-bridged oligo(catechol) compounds for metal-directed self-organization processes
Albrecht, M
[J]. TETRAHEDRON, 1996, 52 (07) : 2385 - 2394
[7] Albrecht M, 1996, SYNTHESIS-STUTTGART, P230
[8] Alkali-metal cation binding by self-assembled cryptand-type supermolecules
Albrecht, M
Rottele, H
Burger, P
[J]. CHEMISTRY-A EUROPEAN JOURNAL, 1996, 2 (10) : 1264 - 1268
[9] ALBRECHT M, 1996, J CHEM SOC CHEM COMM, P2309
[10] Albrecht M., 1995, ANGEW CHEM, V107, P2285

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