European Journal of Inorganic Chemistry · 2009 · 30 citations · 59 references
Natural SciencesChemistryMaterials ScienceInorganic ChemistryMaterials ChemistryOrganometallic ChemistryCoordination ChemistryInorganic SynthesisMetal-ligand BondingOrganometallic SynthesisTransition Metal ChemistryTransition Metal ComplexesBonding In Coordination CompoundsComplexation ChemistryCoordination IsomerismIsomerism In Coordination CompoundsMetalloid Coordination ChemistryMetathesis ReactionsTethered Analogues
Abstract A series of dichloride complexes of titanium and zirconium with amidate and ureate ancillary ligands have been prepared. Three examples of bis(amidate)dichlorotitanium and zirconium complexes were effectively synthesized through salt metathesis with metal tetrachloride as starting materials. Optimum results were achieved using sodium amidate salts formed from sodium bis(trimethylsilyl)amide and neutral amide proligands, while other methods were ineffective. Use of electron‐donating ureate ligands in lieu of amidates enables preparation through alternate routes. Protonolysis of Ti(NMe 2 ) 2 Cl 2 and Zr(NMe 2 ) 2 Cl 2 (dme) with urea proligands leads to dichlorobis(ureate) complexes in good yield. Using a tethered bis(ureate) ligand eliminates the fluxional behaviour and coordination isomerism observed for both bis(amidate) and bis(ureate) zirconium complexes.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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