Solvatothermal chemistry of organically-templated vanadium fluorides and oxyfluorides
摘要:
The solvatothermal reactions of V2O5, the appropriate organoamine and HF in the temperature range 100-180 degrees C yielded a series of vanadium fluorides and oxyfluorides. The compounds [NH4][H3N(CH2)(2)NH3][VF6] (1) and [H3N(CH2)(2)NH3][VF5(H2O)] (2) contain mononuclear V(III) anions, while [H3N (CH2)(2)NH2(CH2)(2)NH3](2) [VF5(H2O)](2)[VOF4(H2O)] (3) exhibits both V(IV) and V(III) mononuclear anions. Both compound 4, [H3NCH2(C6H4)CH2NH3][VOF4]center dot H2O (4 center dot H2O) and compound 5, [HN(C2H4)(3)NH][V2O2F6(H2O)(2)] (5) contain binuclear anions constructed from edge-sharing V(IV) octahedra. In contrast, [H3N(CH2)(2)NH2(CH2)(2)NH3](2)[V4O4F14(H2O)(2)], (6) exhibits a tetranuclear unit of edge-and corner-sharing V(IV) octahedra. Compound 7, [H3N(CH2)(2)NH2][VF5], contains chains of corner-sharing {(VF6)-F-IV} octahedra, while [H2N(C2H4)(2)NH2](3)[V4F17O]center dot 1.5H(2)O (8 center dot 1.5H(2)O) is two-dimensional with a layer of V(III) and V(IV) octahedra in an edge-and corner-sharing arrangement. In the case of [H3N(CH2)(2)NH3][V2O6] (9), there was no fluoride incorporation, and the {V2O6}(n)(2n-) anion is a one-dimensional chain of corner-sharing V(V) tetrahedra. (C) 2009 Elsevier B.V. All rights reserved.