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Issue 35, 2006
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Dinuclear nickel complexes with a Ni2O2 core: a structural and magnetic study

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Abstract

The acetylacetonate complexes [Ni2L1(acac)(MeOH)]·H2O, 1·H2O and [Ni2L3(acac)(MeOH)]·1.5H2O, 2·1.5H2O (H3L1 = (2-(2-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine and H3L3 = (2-(5-bromo-2-hydroxyphenyl)-1,3-bis[4-(5-bromo-2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine) were prepared and fully characterised. Their crystal structures show that they are dinuclear complexes, extended into chains by hydrogen bond interactions. These compounds were used as starting materials for the isolation of the corresponding [Ni2HLx(o-O2CC6H4CO2)(H2O)]·nMeOH and [Ni2HLx(O2CCH2CO2)(H2O)]·nH2O dicarboxylate complexes (x = 1, 3; n = 1–3). The crystal structures of [Ni2HL1(o-O2CC6H4CO2)(H2O)]·MeOH, 3·MeOH, [Ni2HL3(o-O2CC6H4CO2)(H2O)]·3MeOH, 4·3MeOH and [Ni2HL1(O2CCH2CO2)(H2O)]·2.5H2O·0.25MeOH·MeCN, 5·2.5H2O·0.25MeOH·MeCN, were solved. Complexes 3–5 show dinuclear [Ni2HLx(dicarboxylate)(H2O)] units, expanded through hydrogen bonds that involve carboxylate and water ligands, as well as solvate molecules. The variable temperature magnetic susceptibilities of all the complexes show an intramolecular ferromagnetic coupling between the Ni(II) ions, which is attempted to be rationalized by comparison with previous results and in the light of molecular orbital treatment. Magnetisation measurements are in accord with a S = 2 ground state in all cases.

Graphical abstract: Dinuclear nickel complexes with a Ni2O2 core: a structural and magnetic study

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Supplementary files

Article information


Submitted
05 May 2006
Accepted
21 Jun 2006
First published
04 Jul 2006

Dalton Trans., 2006, 4260-4270
Article type
Paper

Dinuclear nickel complexes with a Ni2O2 core: a structural and magnetic study

M. Fondo, A. M. García-Deibe, N. Ocampo, J. Sanmartín, M. R. Bermejo and A. L. Llamas-Saiz, Dalton Trans., 2006, 4260 DOI: 10.1039/B606414K

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