Abstract
Structures of known isopolyoxotungstates are reviewed and an approach to their synthesis from tungsten oxoalkoxides WO(OR)4 is described. Crystal structures of the tetraalkylammonium tungstates Q2WO4.H2O [Q+ = Me4N+ or Me3(PhCH2)N+] have been determined and show the anions to be hydrogen bonded to water molecules in extended chains. Reactions between Q2WO4 and WO(OMe)4 yield the binuclear anions [W2O5(OMe)4]2- via rapid ligand redistribution, and hydrolysis of the tetrabutylammonium salt produces a new isopolytungstate characterised by its 5-line 183W NMR spectrum. This compound is reactive towards CH2Cl2 and MeNO2, producing tetranuclear species in each case. The synthesis and non-aqueous reactivity of (Bun 4N)6[H2W12O40] have also been investigated. Mo6O19 2- reacts with RNCO to give organoimido substituted [Mo6(NR)O18]2- (R = C6H4Me-4 or Bu′) and the crystal structure of the tert-butylimido compound is reported.
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Errington, R.J., Lax, C., Richards, D.G., Clegg, W., Fraser, K.A. (1994). New Aspects of Non-Aqueous Polyoxometalate Chemistry. In: Pope, M.T., MĂ¼ller, A. (eds) Polyoxometalates: From Platonic Solids to Anti-Retroviral Activity. Topics in Molecular Organization and Engineering, vol 10. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0920-8_8
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