Abstract
Two titanium alkoxides [alpha][sub 1]- and [alpha][sub 2]-[Ti[sub 12]O[sub 16]](OPr[sup i])[sub 16], are reported that display very low moisture sensitivity in alcohol solution. A third alkoxide, [Ti[sub 11]O[sub 13]](OPr[sup i])[sub 18],is identified as the sole (>95%) reaction product of Ti(OPr[sup i])[sub 4] hydrolysis by ca. 1/2 equiv of water in i-PrO solution. All these new complexes are members of a new structural family of remarkably stable polyoxotitanate derivatives that display unusual regioselective alkoxide exchange with alcohols. The results strongly suggest that Ti(OP[sup i])[sub 4] titania sol-gel polymerization follows fundamentally different molecular growth pathways than analogous silica sol-gel polymerization. In Si(OCH[sub 3])[sub 4] silica sol-gel polymerization, for example, individual monosilicate units serve as monomer units. In the Ti(OPr[sup i])[sub 18] molecules are formed initially, and these may serve as molecular building blocks for further polymerization reactions. 13 refs., 2 figs.
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