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A Nickel Molybdenum Phosphate with Tunnel: Hydrothermal Synthesis and Structure of (NH3CH2CH2NH3)4 · (NH3CH2CH2NH2) · Na · [Ni2Mo12O30(PO4)(HPO4)4(H2PO4)3] · 6H2O

1999; Elsevier BV; Volume: 146; Issue: 2 Linguagem: Inglês

10.1006/jssc.1999.8368

1095-726X

Lin Xu, Yaqiu Sun, Enbo Wang, Enhong Shen, Zhongri Liu, Changwen Hu, Yan Xing, Yonghua Lin, Heng‐Qing Jia,

Metal-Organic Frameworks: Synthesis and Applications

A nickel molybdenum phosphate, (NH3CH2CH2NH3)4 · (NH3CH2CH2NH2) · Na · [Ni2Mo12O30(PO4)(HPO4)4(H2PO4)3] · 6H2O, involving molybdenum present in V oxidation, has been hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction. Deep brown-red crystals are formed in the triclinic system, space group P1, a=12.011(2), b=14.612(3), c=21.252(4) Å, α=80.54(2)°, β=83.10(2)°, γ=76.29(2)°, V=3561.4(12) Å3, Z=2, λ(MoKα)=0.71073 Å (R(F)=0.0529 for 9880 reflections). Data were collected on a Siemens P4 diffractometer at 20°C in the range of 1.75°<θ<23.02° using the ω-scan technique. The structure was solved by direct methods using the program SHELXTL-93 and refined with the method of full-matrix least-squares on F2. The structure of the title compound may be considered to be two [Mo6O15(HPO4)(H2PO4)3]5− units bonded together with a nickel atom, although several P–O groups are not protonated on account of coordination with a Na+ cation. The one-dimensional tunnels were formed in the solid of the title compound. A probe reaction of the oxidation of acetaldehyde with H2O2 using the title compound as catalyst was carried out in a liquid– solid system, showing that the title compound had high catalytic activity in the reaction.