Structure de Ti6(CH3COO)8(OiPr)8O4

Abstract

Octakis(~-acetato-O, O')-bis(/~-isopropoxy)-hexakis(isopropoxy)-di-/x3-oxo-di-/~-oxohexatitanium, [Ti6(CH3COO)8(O~Pr)804], Mr = 1296.4, triclinic, P1, a = 9.361 (3), b = 11.852 (4), c = 15.791 (5) A, a = 108.54 (3), /3 = 96.54 (3), y = 106.07 (3) °, V = 1556 (2) A3, Z = 1, D,, = 1.32 _ 0-02, Dx = 1.38 Mg m -3, h,(Mo Ka) = 0.71069 A,/~ = 0.798 mm-1, F(000) = 676, T = 298 K, R = 0.059 for 2114 independent reflections. This structure can be described as a hexamer in which Ti atoms, in an octahedral environment, are bridged with the O atoms of oxo, propyl and acetyl groups.

Hexakis(μ-acetato-κ2O,O′)hexaisopropoxyhexa-μ3-oxo-hexatitanium

“…Two types of crystals were produced. Yellow blocks were found to be the same as structure (II) (Laaziz et al, 1990) and colourless plates gave spectroscopic data consistent with the structure of (I) (Papiernik et al, 1998), indicating a hexaprismane type complex. We have fully characterized (I) by single-crystal X-ray crystallography.…”

“…An examination of solely acetic-acid-modified hexatitanium isopropoxide complexes has produced three of the four possible shapes; a hexaprismane shape for the title compound, (I), has already been predicted by spectroscopic means (Papiernik et al, 1998), and X-ray crystallography has confirmed a rutilane shape for [Ti 6 ( 3 -O) 2 ( 2 -O) 2 ( 2 -OPr i ) 2 (OPr i ) 6 ( 2 -OAc) 8 ], (II) (Laaziz et al, 1990) and a bitricyclane shape for [Ti 6 ( 3 -O) 2 ( 2 -O) 2 ( 2 -OPr i ) 6 -(OPr i ) 6 ( 2 -OAc) 4 ], (III) (Doeuff et al, 1989). Each of the above complexes was prepared using conventional solvent methods.…”

Crystallization of TiO2 Powders and Thin Films Prepared from Modified Titanium Alkoxide Precursors

“…The crystal structures of [6,4] and [6,6] ( R =−H or −CH 3 ) have previously been reported by Laaziz et al ., 44 Boyle et al ., 29 and Papiernik et al ., 30 respectively. In all cases, the bidentate ligands (acetate or formate groups) adopt a bridging geometry and the six‐fold coordination sphere of each Ti(IV) site is satisfied with bridging oxo, carboxylate, and isopropoxy ligands, and terminal isopropoxy groups.…”

Ti8O8(OOCR)16, a New Family of Titanium–Oxo Clusters: Potential NBUs for Reticular Chemistry

“…The higher degree of substitution by the bidentate carboxylate ligands forces the structure to become less condensed, since a coordination number larger than six is not possible. A smaller degree of substitution was found in [Ti 6 O 4 (OR) 8 (OOCRЈ) 8 ], [19,49] [Ti 6 O 4 (OR) 12 (OOCRЈ) 4 ], [27] and [Ti 4 O 4 (OR) 4 (OOCRЈ) 4 ]. [50] The titanium atoms are octahedrally coordinated in all derivatives, and the carboxylate ligands are bridging.…”