Highly ordered mesoporous crystalline MoO(2) materials with bicontinuous Ia3d mesostructure were synthesized by using phosphomolybdic acid as a precursor and mesoporous silica KIT-6 as a hard template in a 10% H(2) atmosphere via nanocasting strategy. The prepared mesoporous MoO(2) material shows a typical metallic conductivity with a low resistivity ( approximately 0.01Omega cm at 300 K), which makes it different from all previously reported mesoporous metal oxides materials. Primary test found that mesoporous MoO(2) material exhibits a reversible electrochemical lithium storage capacity as high as 750 mA h g(-1) at C/20 after 30 cycles, rendering it as a promising anode material for lithium ion batteries.

Composition space diagrams have been used to study phase stability of mixed transition metal oxide fluorides synthesized by hydrothermal reaction of the metal oxides in (HF)(x)().pyridine/H(2)O/pyridine solution (150 degrees C, autogenous pressure). The combination of early (Ti, Zr, Hf, Nb, Ta, Mo, W) and late (Cu, Cd, Zn) transition metals and the effects of varying the mole ratios of the metals, (HF)(x)().pyridine, and water are examined in this study. Single-crystal products containing [Cu(py)(4)](2+), [Cd(py)(4)](2+), or [Zn(py)(4)](2+) cations and [TiF(6)](2)(-), [ZrF(6)](2)(-), [HfF(6)](2)(-), [NbOF(5)](2)(-), [TaOF(5)](2)(-), [MoO(2)F(4)](2)(-), or [WO(2)F(4)](2)(-) anions are recovered. Relative stability of the crystalline products is governed by the negative charge distribution on the anions, as well as the concentrations of each reactant in solution. Two new structures are reported: Cu(NC(5)H(5))(4)TaOF(5) and Cu(NC(5)H(5))(4)TiF(6).3H(2)O. Crystal data: for Cu(NC(5)H(5))(4)TaOF(5), monoclinic, space group C2/c (No. 15), with a = 10.541(3) Å, b = 13.547(6) Å, c = 16.04(1) Å, beta = 97.73(5) degrees, and Z = 4; for Cu(NC(5)H(5))(4)TiF(6).3H(2)O, monoclinic, space group C2/c (No. 15), with a = 12.767(4) Å, b = 12.048(2) Å, c = 17.787(6) Å, beta = 109.9(1) degrees, and Z = 4.

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The systematic and controlled reduction of vanadium oxide nanoscrolls results in routes to the largescale preparation of nanostructures of the interesting and useful materials rutile VO 2 and corundum V 2 O 3 . Vanadium oxide (V 2 O 5-δ ) nanoscrolls, prepared by the hydrothermal treatment of aged suspensions of V 2 O 5 and dodecylamine, were reduced in a furnace in an atmosphere of 5% H 2 :95% N 2 under different time and temperature conditions to monitor systematic trends in the structure and morphology of the resulting oxides. The products were characterized by X-ray diffraction (XRD), electron microscopy, N 2 sorption measurements, and electrical transport studies. We find that the reduction conditions (time and temperature) play a significant role in determining the crystal structure and morphology of the products. At short times and low temperatures, the reduction products are rutile VO 2 . These convert to corundum V 2 O 3 when temperatures are increased. In all cases, the appearance of crystalline Bragg peaks in XRD is associated with the breaking up of the starting high-aspect nanostructures into small, dense crystallites. Under certain reduction conditions, porous materials with ill-defined X-ray structures are obtained as intermediates.