Two crystal forms of titanium(IV) methoxide

Abstract

The structure of metal alkoxides has received considerable attention in recent years1-' but polymorphism in this class of compounds has not been reported.Titanium(1v) methoxide was first prepared by Bischoff and Adkins8 by an ester interchange reaction. The product (compound A) is a white insoluble powder. Dunno prepared the methoxide from titanium tetrachloride and methanol in the

Carboranylimine-complexed titanium (IV) organometallics: An investigation of synthesis, structure and catalytic polymerization

“…In far-IR spectra (Fig. 2), compounds 4 and 5 show strong absorptions in the range of 425e500 cm À1 , which are consistent with the reported n TieCl and n TieO absorptions [28,29]. In comparison with 4, compound 5 shows one more peak that could be due to the vibration of TieO bond in 5.…”

DFT predictions of vibrational spectra of titanium tetramethoxide oligomers and the structure of titanium tetraalkoxides in liquid and solid phases

“…One isomer (I), belonging to the C i point group, is built from three interconnected titanium oxide tetrahedra with a linear arrangement of titanium atoms. This structure have a titanium oxide skeleton similar to that of Ti 3 (OH) 12 . The other isomer (II), of C 2 symmetry, is built by edge sharing TiO 6 groups.…”

“…The X-ray diffraction study of single crystal grown from this solution has revealed the tetrameric structure of the B modification [6]. Spectroscopic studies [12,13] also evidence the presence of tetramers in the B phase. However, the structure of the A modification remains uncertain.…”

“…Infrared and X-ray powder diffraction studies of titanium tetramethoxide [12,13] revealed that there exist two modifications of the solid phase. The microcrystalline form (A) is insoluble in most organic solvents, while the other form (B) is soluble in toluene.…”

“…In a previous communication [14], we described the results of the B3LYP scan of the Ti 3 (OH) 12 potential energy surface with the aim to establish what structures of the Ti 3 O 12 titanium-oxygen skeleton, from those proposed earlier for titanium tetraalkoxides [7][8][9][10][11], correspond to energy minima. However, the picture of relative stabilities of different TiO structures is blurred by intramolecular hydrogen bonds inherent to hydroxides.…”