Issue 4, 1990

The transient template effect: chromium(III)-directed syntheses of metal-free macrocyclic ligands and crystal structure of 1,11-bis(2′-hydroxyethyl)-4,8;12,16;17,21-trinitrilo-1,2,10,11-tetra-azacyclohenicosa-2,4,6,9,12,14,18,20-octaene hydrochloride tetrahydrate

Abstract

A range of metal-free quinquedentate macrocyclic ligands incorporating 2,2′-bipyridine or 1,10-phenanthroline donor groups has been prepared by the use of a chromium(III) transient template. The transient template effect is shown to be due to pH effects resulting from the presence of chromium(III) complexes in aqueous solution, rather than a process in which the open-chain ligands become co-ordinated to the metal centre. The crystal and molecular structure of a free macrocyclic ligand is reported, as is the preparation of some chromium(III) complexes of open-chain and macrocyclic complexes.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1990, 1397-1404

The transient template effect: chromium(III)-directed syntheses of metal-free macrocyclic ligands and crystal structure of 1,11-bis(2′-hydroxyethyl)-4,8;12,16;17,21-trinitrilo-1,2,10,11-tetra-azacyclohenicosa-2,4,6,9,12,14,18,20-octaene hydrochloride tetrahydrate

L. Chung, E. C. Constable, A. R. Dale, M. S. Khan, M. C. Liptrot, J. Lewis and P. R. Raithby, J. Chem. Soc., Dalton Trans., 1990, 1397 DOI: 10.1039/DT9900001397

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