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desirable to attach organic functionalities covalently to the surface of polyoxoanions. As part of a broad program centered on the functionalization of polyoxometalates, we have been interested in the derivatisation of Lindqvist type polyoxoanions with organosilyl moieties. The condensed polyoxometalate (nBu4N)4[(TaW5O18)2O] which is synthesized by reacting [TaW5O19] with BuSnCl3, crystallises in the orthorhombic system, space group Pbnb with lattice parameters a = 15.7981(14), b = 17.939(3), c = 35.216(6)Å, V= 9980 Å and Z = 4. The crystallographic study of(nBu4N)4[(TaW5O18)2O] shows that the dimer is composed from two polyoxoanions fragments linked by linear Ta-O-Ta bridge. Such a linkage readily reacts with organosilyl (Lewis electrophilic reagents), such as RR’ 2SiOH (R = R’ = Et, iPr, OtBu, Ph; R = tBu, R’ = Me) to yield monomeric plenary Lindqvist derivatives (nBu4N)2[W5O18Ta(O)SiR’R2]. These derivatives are characterized in the solid state by IR and in solution by multinuclear NMR (C, Si, W). The crystallographic study of (nBu4N)2[(W5O18Ta(O)SiPh3)]indicates that {SiPh3} is grafted on the surface of the polyanion through the terminal Ot-Ta oxygen atom.

Octamolybdates – promising materials for industry and medicine