Preparation and Characterisation of Seven-co-ordinate Trifluoroacetate and Oxalate Complexes of Molybdenum(II) and Tungsten(II)

DOI: 10.1039/DT9930000245

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 245 - 252 (1993)

Update date:2022-08-05

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Authors:

Brisdon, Brian J.

Hodson, Annabelle, G. W.

Mahon, Mary F.

Molloy, Kieran C.

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Article abstract of DOI:10.1039/DT9930000245

The 1:1 reaction of sodium trifluoroacetate with either (M = Mo or W, PR3 = PMe2Ph or PMePh2) or (M = Mo or W) formed the mononuclear complexes containing a bidentate carboxylate ligand.Addition of a second equivalent of the carboxylate salt generated in which the oxygen-donor ligands adopt one bidentate and one monodentate bonding mode.Single-crystal X-ray diffraction studies of confirm a 4:3 polytopal form.The treatment of (M = Mo, PR3 = PMePh2; M = W, PR3 = PMe2Ph or PMePh2) or (M = Mo or W) with a suspension of sodium oxalate in acetone yielded the complexes <2(μ-C2O4)>.The tungsten species <2(μ-C2O4)> crystallises in two forms both of which contain a planar oxalate bridge linking two seven-co-ordinate metal centres, but have different 4:3 geometries.The triangular face of the polygon in each of the three structures is occupied by a bromine atom and two oxygens of a carboxylate group, and the quadrilateral face by pairs of carbonyl and phosphine ligands.

Full text of DOI:10.1039/DT9930000245

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