Syntheses and Structures of Oxovanadium (IV) Complexes, HB(pz)3VO(ph-acac) · 2H2O (pz, Pyrazole) and HB(3,5-Me2pz)3VO(ph-acac) · 2H2O and V2O4[HB(pz)3]2 · 2CH3CN.

The reaction of VO(ph-acac)2 (ph-acac=phenyacetylacetonato) with NaHB(pz)3 (pz=pyrazole) or NaHB(3,5-Me2pz)3 in the solution of MeOH gave oxovanadium (IV) complexes HB(pz)3VO(ph-acac) · 2H2O (1) and HB(3,5-Me2pz)3VO(ph-acac) · 2H2O (2), respectively. An oxovanadium complex, V2O4[HB(pz)3]2 · 2CH3CN (3), was obtained by the reaction of VOSO4 · 3H2O with tri(pyrazolyl)borate sodium in MeOH. The complexes 1, 2 and 3 were characterized by elemental analysis, IR, UV-Vis, NMR. In particular, the crystals of complex 1 and 3 were determined by X-ray diffraction. They crystallize in space group P21/c, a=16.497(5) Å, b=7.6601(19) Å, c=17.199(4) Å, β=107.498(19)°, V=2072.8(9) Å3, Z=4, R=0.0371 (I>2σ(I)) for 1; in the monoclinic, space group Pbca, with cell dimensions of a=15.531(2) Å; b=18.007(2) Å; c=10.725(2) Å; V=2999.4(8) Å3, Z=4, R= 0.0401(I>2σ(I)) for 3. Structure analyses have shown that complex 1 is a monomeric oxovanadium complexe containing polypyrazolylborate and two lattice water. Complex 3 consists of a V2O4(HB(pz)3)2 molecule and two free CH3CN lattice molecules in an unit cell. Both possess a similar coordination mode for the vanadium atom. In addition, luminescence properties and thermal analysis characterization of the complexes also are discussed. [ABSTRACT FROM AUTHOR]