Anionic fischer-type carbene complexes as bidentate (N,O) ligands

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dc.contributor.authorRaubenheimer H.G.
dc.contributor.authorDu Toit A.
dc.contributor.authorDu Toit M.
dc.contributor.authorAn J.
dc.contributor.authorVan Niekerk L.
dc.contributor.authorCronje S.
dc.contributor.authorEsterhuysen C.
dc.contributor.authorCrouch A.M.
dc.date.accessioned2011-05-15T15:59:07Z
dc.date.available2011-05-15T15:59:07Z
dc.date.issued2004
dc.description.abstractNew polynuclear complexes, (L1)3 M2{M 2 = Cr(III) (4a, 4b), Fe(III) (5), Co(III) (8)}, (L1) 2M2(L2)2 {M2 = Co(II)(7), Ni(II) (9)}, (L1)2M2(O)L2 {M 2 = V(IV) (6)} and L1M2Cp2 {M 2 = Ti(III) (10)} with L1 = (CO)M1=C{C=NC(CH 3)=CHS}O (M1 = Cr or W) and L2 = 4-methylthiazole or THF, are described. The molecular structures of these complexes determined by X-ray diffraction show that the Fischer-type carbene complexes act as bidentate ligands towards the second metal centre, coordinating through C(carbene)-attached O-atoms and imine N-atoms of the thiazolyl groups to form five-membered chelates with the oxygen atoms in the mer configuration. Isostructural complexes have similar characteristic band patterns in their far-IR spectra. Cyclic voltammetry of selected complexes reveals the oxidation of the carbene complex ligand between 1.01 and 1.29 V. Oxidation of the central metal (M2) takes place at 0.56 and 0.86 V for 7 and 9, respectively. Three stepwise reductions of Cr(III) to Cr(0) occur for 4a and 4b in the region -0.51 to -1.58 V. These new ligand types and other variants thereof should find application in ligand design with the first metal - and other ligands attached thereto - in the carbene complex ligand, playing an important role.
dc.description.versionArticle
dc.identifier.citationDalton Transactions
dc.identifier.citation8
dc.identifier.issn14779226
dc.identifier.urihttp://hdl.handle.net/10019.1/11011
dc.subjectComplexation
dc.subjectCrystallization
dc.subjectCyclic voltammetry
dc.subjectElectrons
dc.subjectGold compounds
dc.subjectMolecular structure
dc.subjectMolecular vibrations
dc.subjectNuclear magnetic resonance spectroscopy
dc.subjectOxidation
dc.subjectOxygen
dc.subjectX ray crystallography
dc.subjectX ray diffraction analysis
dc.subjectBidentate ligands
dc.subjectElectron pairs
dc.subjectPolymetallic complexes
dc.subjectPolynuclear complexes
dc.subjectOrganic compounds
dc.titleAnionic fischer-type carbene complexes as bidentate (N,O) ligands
dc.typeArticle
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