Formation and Structural Characterisation of an Unusual Cyclic HexamericOxotitanium Complex

Abstract

Ti 6 O 6 (MDEA) 6 ·2CH 2 Cl 2 (MDEA = N-methyldiethoxoamine)consists of a ring of six [TiO 5 N] octahedra, edge bridged by µ 2 -oxide and a µ 2 -alkoxide arm of the aminoalkoxide ligand. was obtained by the controlled hydrolysis of the Ti(MDEA) 2 complex and analysed by X-ray diffraction. The compound

A centrosymmetric triply alkoxo-bridged titanium-μ2-O-zirconium tetranuclear complex: [TiZr(μ2-O,μ2-O′-methyliminodiethanolate)(μ2-O-n-propanolate)2(n-propanolate)2.7(isopropanolate)1.3]2

“…The ZrÐO lengths of the bound isopropanolate ligands in JARSUQ are similar to those for the n-propanolate here, at 1.940 (4) A Ê . All the TiÐO bond lengths are similar to those found previously, with the typically longer bridging bonds [2.140 (4), 2.171 (4) and 2.174 (4) A Ê ] comparable with previous mean values of 2.107 (Kemmitt et al, 1999) and 2.103 A Ê (Sevast'yanov et al, 2001).…”

Cost efficient preparation of lead aminoalkoxides directly from lead(II) oxide

“…[1,2], which can include mixed metal species [3]. We have been examining aminoalkoxides of metals, such as zirconium and titanium [4][5][6] both because of their favorable hydrolysis and condensation characteristics, but also in the capability to produce aminoalkoxides directly from metal oxides. The direct reaction of usual alcohols (EtOH, iPrOH) with lead oxide was shown to form oxoalkoxides [7].…”

Titanium (IV) complexes based on substituted 2-[(2-hydroxyethyl)]aminophenols

“…Table 1 lists selected geometrical parameters for this compound. Compound 10 possesses in the solid state polynuclear structure which is closely related to that described earlier for [Ti(l 2 -O){OCH 2 CH 2 }{l 2 -OCH 2 CH 2 }-NMe] 6 [18]. The structure is pseudocentrosymmetric, each titanium atom tied to two neighbouring metal atoms by oxygen atoms of Ti-O-Ti bonds and l 2 -bridging NCH 2 CMe 2 O-groups.…”

“…In coordination sphere of titanium the alkanolaminophenol (2) The distance Ti-N in 10 [2.367(5) Å , 2.362(6) Å , 2.376(6) Å ] is close to that previously found [2.310(2)-2.471(2) Å ] for hexacoordinated titanium complexes, based on dialkanolamines: titano-spiro-bis(ocanes) [13], dimeric titanocanes [20] and [Ti(l 2 -O){OCH 2 CH 2 }{l 2 -OCH 2 CH 2 }NMe] 6 [18]. The phenolic ring conjugated with nitrogen atom does not significantly increase the Ti-N bond in complex 10 in comparison with that for Kemmitt's hexanuclear structure [18]. [9,17,21].…”

“…The main idea of such complexes preparation was to prepare more stable species which are also useful as above mentioned catalysts. Recently, related complex [Ti(l 2 -O)-{OCH 2 CH 2 }{l 2 -OCH 2 CH 2 }NMe] 6 based on N-methyldiethanolamine has been obtained in analogous conditions [18]. The molecular structure of 10 was investigated by X-ray analysis.…”