title: Acetic Acid Mediated Synthesis of Phosphonate-Substituted Titanium Oxo Clusters.
abstract: New phosphonate/acetate-substituted titanium oxo/alkoxo clusters were prepared from Ti(OiPr)4and bis(trimethylsilyl) phosphonates in the presence of acetic acid, which served to generate water in situ through ester formation. The process led to clusters with a higher degree of condensation than in previously known phosphonate-substituted titanium oxo clusters. The clusters [Ti6O4(OiPr)10(OAc)2(O3PR)2] (OAc = acetate) were obtained for a large variety of functional and non-functional groups R under a range of reaction conditions. This cluster type, which is also retained in solution, therefore appears to be very robust. Two other clusters, [Ti5O(OiPr)11(OAc)(O3PCH2CH2CH2Br)3] and [Ti5O3(OiPr)6(OAc)4(O3P-xylyl)2], were only isolated in special cases.
authors: Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9, 1060 Wien, Austria.
authors: Matthias
authors: M
authors: Czakler
authors: Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9, 1060 Wien, Austria.
authors: Christine
authors: C
authors: Artner
authors: Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9, 1060 Wien, Austria.
authors: Ulrich
authors: U
authors: Schubert
keywords: Cage compounds; Cluster compounds; Hydrolysis; P ligands; Titanium