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Issue 16, 2004
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Triangles and tetrahedra: metal directed self-assembly of metallo-supramolecular structures incorporating bis-β-diketonato ligands

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Abstract

The interaction of six aryl-linked bis-β-diketones, including a new naphthylene linked species, with copper(II), iron(III) and, in one instance gallium(III), has been investigated with the aim of obtaining metallo-supramolecular assemblies exhibiting different geometries. New examples of two assembly types incorporating the above bis-β-diketones (L) were generated. The first type is represented by a range of molecular triangles of formula [Cu3(L–H2)3](solvent)n while the second is given by a corresponding selection of less-common neutral molecular tetrahedra of formula [Fe4(L–H2)6](solvent)n as well as [Ga4(L–H2)6]·8.5THF·0.5H2O; an example of each type has been characterised by X-ray crystallography. A magnetochemical investigation of [Fe4(3–H2)6]·6THF is reported. The susceptibility is Curie like and consistent with very weak coupling occurring between the iron(III) d5 (high spin) centres. The X-ray structures of two trinuclear copper(II) as well as a tetranuclear iron(III) and a tetranuclear gallium(III) assembly confirm their discrete triangular and tetrahedral geometries, respectively. The structure of the gallium(III) species is closely related to that of the corresponding iron(III) species. The tetrahedral structures provide rare examples of such assemblies encapsulating guest solvent molecules – in each case tetrahydrofuran is incorporated in the central cavity.

Graphical abstract: Triangles and tetrahedra: metal directed self-assembly of metallo-supramolecular structures incorporating bis-β-diketonato ligands

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Article information


Submitted
11 Mar 2004
Accepted
21 Jun 2004
First published
19 Jul 2004

Dalton Trans., 2004, 2417-2423
Article type
Paper

Triangles and tetrahedra: metal directed self-assembly of metallo-supramolecular structures incorporating bis-β-diketonato ligands

J. K. Clegg, L. F. Lindoy, B. Moubaraki, K. S. Murray and J. C. McMurtrie, Dalton Trans., 2004, 2417
DOI: 10.1039/B403673E

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