Reactions of titanium tetrachloride with carboxylic acids. Crystal and molecular structure of the dinuclear titanium oxo compound [{TiCl2(O2CBut)(ButCO2H)}2O]

The chemistry of niobium and tantalum halides, MX5, with haloacetic acids and their related anhydrides: Anhydride C–H bond activation promoted by MF5

“…For instance, the C-O stretching vibration is observed at cm -1 in the IR spectrum of 5b: this value is significantly closer to 1714 cm −1 (uncoordinated MeCOOH, [9]), rather than to the wavenumbers (1545 ÷ 1558 cm −1 ) found for the bidentate carboxylate moiety within 2a-c. These data are in agreement with those observed in other metal complexes [17] Unfortunately, due to the fact that we were not able to grow crystals suitable for X ray investigation, we cannot describe in more detail the structural features of the cation of 5. The chemistry of MF 5 with acetic anhydride and chloroacetic anhydride was then investigated.…”

Titanium oxo carboxylate compounds. Crystal and molecular structures of [{TiCl2(O2CEt)(ETCo2H)}2O] and [Ti3Cl3O2(O2CEt)5] and an unusual quantitative conversion of a Ti2O to a Ti3O2 oxo derivative

“…A major change in the reaction occurs when a 1 : 2.5 (Ti : acid) molar ratio is used, since even at 25 "C pale yellow or colourless air-sensitive precipitates are obtained. We have previously identified two of the products as being the dinuclear 0x0 species [{TiC12(02CR)(RC02H)}20] (R = Me 3a or Bu' 3b), 12 and we have now shown that the propanoate analogue (R = Et 3c) has a similar composition. All the reactions proceed in high yield by an 0x0-abstraction process with the concomitant formation of HCl and the acid chloride, indicating that the acid not only provides a carboxylate group but also splits cleanly into three fragments uiz.…”

Solution-Phase Synthesis of Titanium Dioxide Nanoparticles and Nanocrystals

“…These facets, which represent a small percentage of the entire exposed surface in the most thermodynamically stable morphology of anatase, have been suggested as potentially more reactive than the {101} facets that usually dominate in anatase nanocrystals. , It has been found that fluoride can strongly bind the {001} facets at the exposed 5-fold coordinated Ti cations, reducing their surface energy and allowing growth to occur on the {101} facets. , Most of the early syntheses utilized HF as the structure-directing agent, but HF is very corrosive and dangerous to handle. TiF 4 , on the other hand, is a stable compound that has been postulated to dissociate at high temperature in the presence of carboxylic acids into HF and titanium complexes, similarly to what is observed with TiCl 4 . − …”