Surface oxo-anions

The deposition of catalytically important elements from groups 4-6 can be dealt with in a number of ways. Geus and coworkers [55-57] have developed a method that is not so well known hut can he advantageously applied to deposit, in particular, Ti, V, and Mo. The challenge in the deposition of the metal oxides mentioned refers to the incompatihUity of their aqueous chemistry and the oxide surface chemistry. In particular, anions such as V04 do not interact significantly with silica at relevant pH values. The proposed method involves reduction of these oxo-anions to lower valence cations that do interact with silica. 

Ab initio study of the potential energy surface for P—C bond rotation in the 2-oxo-and 2-thioxo-2-methyl-l,3,2-diazaphosphorinane and -1,3,2-diazaphosphosolidine anions has established that in each case the lowest energy six-membered ring structure features a near planar carbanion with its substituent parallel to the P=X axis (X = 0, S).78... 

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