Issue 7, 2003
From the journal:

Dalton Transactions

Dicobalt(ii) complexes of a triazolate-containing Schiff-base macrocycle: synthesis, structure and magnetism

Udo Beckmann,a   Sally Brooker,*a   Craig V. Depree,a   Janna D. Ewing,a   Boujemaa Moubarakib  and  Keith S. Murrayb  

* Corresponding authors

a Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
E-mail: sbrooker@alkali.otago.ac.nz
Fax: +64 3 479-7906
Tel: +64 3 479-7919

b School of Chemistry, Monash University, PO Box 23, Clayton, Victoria 3800, Australia

Abstract

A new Schiff-base macrocycle is obtained by the lead(II) ion templated [2+2] condensation of 3,5-diacetyl-1H-1,2,4-triazole and 1,4-diaminobutane in the presence of sodium hydroxide. Transmetallation of the resulting dilead complex, Pb2(L2)(ClO4)21, in acetonitrile with two equivalents of CoCl2·6H2O leads to the isolation of an orange, six-coordinate complex, [CoII2(L2)(OH2)3(NCCH3)](ClO4)2·H2O·2CH3CN 2. Subsequent reaction of 2 with two equivalents of NaOCN or NEt4Cl yielded red–purple five-coordinate [CoII2(L2)(NCO)2] 3 and red five-coordinate [CoII2(L2)(Cl)2]·1.5CH3CN 4, respectively. In all three air-stable dicobalt complexes the macrocycles contain two high-spin cobalt(II) centers which are weakly antiferromagnetically coupled (2J = −3.0, −0.4, −3.5 cm−1 for 2, 3 and 4, respectively). Complexes 2–4 have been characterized by X-ray diffraction and are the first structurally characterised complexes of a triazolate-containing macrocycle to date.

Graphical abstract: Dicobalt(ii) complexes of a triazolate-containing Schiff-base macrocycle: synthesis, structure and magnetism

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Article information

DOI
https://doi.org/10.1039/B212131J
Article type
Paper
Submitted
10 Dec 2002
Accepted
30 Jan 2003
First published
19 Feb 2003

Dalton Trans., 2003, 1308-1313

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Dicobalt(II) complexes of a triazolate-containing Schiff-base macrocycle: synthesis, structure and magnetism

U. Beckmann, S. Brooker, C. V. Depree, J. D. Ewing, B. Moubaraki and K. S. Murray, Dalton Trans., 2003, 1308 DOI: 10.1039/B212131J

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