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

Lap Yan Chung, Edwin C. Constable, Adrian R. Dale, Muhammed S. Khan, Michael C. Liptrot, Jack Lewis, Paul R. Raithby

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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.

Original languageEnglish
Pages (from-to)1397-1404
Number of pages8
JournalJournal of the Chemical Society, Dalton Transactions
Issue number4
Publication statusPublished - 1990


ASJC Scopus subject areas

  • Chemistry(all)

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