Issue 4, 2002
From the journal:

Journal of the Chemical Society, Dalton Transactions

A tris-imidazolecarboxyaldehyde copper(ii) complex with unusual carbonyl co-ordination: structure and reactivity

Jose M. Domínguez-Vera,*a   Antonio Rodríguez,a   Rafael Cuesta,b   Raikko Kivekäsc  and  Enrique Colacioa  

* Corresponding authors

a Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain

b Departamento de Química Inorgánica y Orgánica, E.U.P. de Linares C/Alfonso X “El Sabio” No. 28, Jaén, 23700 Linares, Spain

c Department of Chemistry, University of Helsinki, FIN-00014, Finland

Abstract

4-Methyl-5-imidazolecarboxyaldehyde (HL1) reacts with copper(II) perchlorate to give the complex [Cu(HL1)3](ClO4)2. Its X-ray structure reveals that three ligands are bonded to the copper(II) ion in a bidentate chelate fashion through the imidazole nitrogens and aldehyde oxygen atoms, leading to a CuN3O3 chromophore. Carbonyl co-ordination to copper(II) is not usual, in fact there are very few reported examples of structurally characterised complexes of this type. When [Cu(HL1)3](ClO4)2 is dissolved in a KOH-containing methanol solution, the polymer [Cu(L1)2]n precipitates. The magnetic properties of [Cu(L1)2]n are typical of an imidazolate-bridged copper(II) system in which the bridge involves equatorial positions on the copper(II) co-ordination polyhedra. A J value of −58.1 cm−1 was calculated by application to the experimental data of the theoretical equation for a uniform one-dimensional infinite chain system. Additionally, the co-ordinated carbonyl groups of [Cu(HL1)3](ClO4)2 react with 1,3-diaminopropane, leading to a new monomeric Schiff-base copper(II) complex. However, this reaction does not take place when the diamine is 1,2-diaminopropane, which is likely due to the sterically promoted low reactivity for imine bond formation with the –NH2 group close to the methyl substituent in 1,2-diaminopropane.

Graphical abstract: A tris-imidazolecarboxyaldehyde copper(ii) complex with unusual carbonyl co-ordination: structure and reactivity

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Article information

DOI
https://doi.org/10.1039/B106982A
Article type
Paper
Submitted
01 Aug 2001
Accepted
14 Nov 2001
First published
29 Jan 2002

J. Chem. Soc., Dalton Trans., 2002, 561-565

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A tris-imidazolecarboxyaldehyde copper(II) complex with unusual carbonyl co-ordination: structure and reactivity

J. M. Domínguez-Vera, A. Rodríguez, R. Cuesta, R. Kivekäs and E. Colacio, J. Chem. Soc., Dalton Trans., 2002, 561 DOI: 10.1039/B106982A

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