title: Cyclic bis(β-diketonate)- and bis(β-ketoesterate)-bridged titanium and zirconium alkoxide derivatives.
abstract: Reaction of Ti(OiPr)(4) with various bis(β-diketones) and bis(β-ketoesters) (LH(2)) results in the formation of dimeric complexes [Ti(OiPr)(2)L](2), where each metal centre is coordinated by two terminal OiPr ligands and two bridging β-diketonate or β-ketoesterate groups (L). Macrocycles containing two M(OiPr)(2) moieties are thus formed. Reaction of Zr(OiPr)(4) with the same bis(β-diketones) and bis(β-ketoesters) results in different compounds, depending on the organic spacer connecting the two functional groups. With shorter spacers, the compounds [ZrL(OiPr)(2)](2)·2iPrOH are obtained, with the same structures as the corresponding titanium complexes. With longer spacers, however, complexes with a higher degree of substitution are formed, such as (ZrL(2))(2) and Zr(2)L(3)(OiPr)(2)·2iPrOH. The molecular weight and structure of all compounds was elucidated by ESI-MS. MS/MS of the corresponding [M+Na](+) precursor ions confirmed the proposed structures based on structure-specific product ions. Solution NMR experiments and DFT calculations additionally supported the proposed structures.
authors.affiliation: Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060, Vienna, Austria.
authors.forename: Christian
authors.initials: C
authors.lastname: Maurer
authors.forename: Ernst
authors.initials: E
authors.lastname: Pittenauer
authors.forename: Van An
authors.initials: VA
authors.lastname: Du
authors.forename: Günter
authors.initials: G
authors.lastname: Allmaier
authors.forename: Ulrich
authors.initials: U
authors.lastname: Schubert