Titanate molecule groups

Function 2 relates to the ability of the titanate molecule to transesterify. It implies the formation of chemical bonds between the titanate and the polymer matrix containing, for example, groups such as COOH and OH. Titanates can gel polyesters and epoxies and cure alkyds, even though there is no unsaturation in the titanate molecule backbone. 

Function 2 concerns the part of the titanate molecule immediately adjacent to the titanium center and that affects the specific effect, the resistance to hydrolysis, the transesterification activity, and the thermal stabiUty of titanates. This part of the molecule can be represented by the following groups ... 

These new results only became possible when the groups of H. Waite and B. Magee at the South West Research Institute (SWRI) in San Antonio, Texas, combined analytical data obtained from two different instruments. These are the ion and neutral mass spectrometer (INMS), which obtained data on small to medium-sized molecules in the upper atmosphere of Titan (950-1,150 km) and the Cassini plasma spectrometer (CAPS), which also registered particles from tholins, both positive (100-350 Da) and negative ions (20-8,000 Da) (Waite et al., 2007 Atrey, 2007). 

It is also known that once the tributyltin radical adds to the sulfur of N-hydroxypyridine-2-thione, breakage of the N-0 bond and decarboxylation are very fast and probably concerted. They are driven energetically by formation of the very stable carbon dioxide molecule. It comes as no surprise that if atoms other titan carbon are attached to the carboxyl group, then they would also end up as free radicals after decarboxylation. This is shown for a urethane analog as a source of nitrogen-centered free radicals. A wide variety of other free-radical species can be produced by this strategy, and it is thus quite useful. 

Normally, transesterif Icat ions are acid- or base-catalyzed, e.g., sulfuric acid, p-toluenesulfonic acid, and potassium or sodium alkoxides in the appropriate alcohols. These methods fail with molecules containing acld-or base-labile functional groups. The titanate-mediated esterifications, deacylations, and transesterifications of rather simple, monofunctional substrates are described in the patent literature see the references in a recent article. Recently, Seebach, et al. 4 have demonstrated that this method is applicable also to substrates with additional functional groups... 

The mesoporous structure, with high surface area could provide simple accessibility of guest molecules to the active sites and increase their chances to receive light. One research group fabricated mesoporous photocatalysts with delaminated structure. The exfoliated layered titanate in aqueous solution was reassembled in the presence of anatase Ti02 nanosol particles to make a great number of mesopores and increase the surface area of Ti02 [370] (see Table 6). 

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