Hydrothermal Synthesis and Structure Characterization of a New Four-capped Metal-oxygen Cluster [NiMo12O40H10{Ni(H2O)3}4]

Abstract

Abstract: A Hydrothermal reaction of MoO₃, NiCl₂·6H₂O, WO₃ and H₂O with a molar ratio of 1:0.6:1:83.3 gives a rhombic-shaped black crystal [NiMo₁₂O₄0H₁₀{Ni(H₂O)₃}₄]. It crystallizes in a tetragonal system with space group I4₁/amd and unit cell parameters a=b=1.518 4(2) nm, c=3.082 9(6) nm, Z=4, V=7.108(2) nm³, R=0.067 1, _wR=0.217 8. The compound possesses a four-capped Keggin structure. The structure of the Keggin-[NiMo₁₂O₄0H₁₀]^8- consists of twelve MoO₆ octahedrons and a NiO₄ tetrahedron on the center. Four [Ni(H₂O)₃]²⁺ at the cap positions are linked to Keggin-structure by three μ 3-O, respectively. The calculation of bond valence shows that the oxidation state of Mo in the compound is +5.

Key words: Molybdenum-nickel-oxo cluster, Four-capped Keggin structure, Hydrothermal synthesis

CLC Number:

O614

TrendMD:

SU Chang, XU Ji-Qing, ZENG Qing-Xin, CUI Xiao-Bing, LI Chuan-Bi, ZHANG Li-Juan . Hydrothermal Synthesis and Structure Characterization of a New Four-capped Metal-oxygen Cluster [NiMo₁₂O₄₀H₁₀{Ni(H₂O)₃}₄][J]. Chem. J. Chinese Universities, 2003, 24(7): 1166.

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Hydrothermal Synthesis and Structure Characterization of a New Four-capped Metal-oxygen Cluster [NiMo₁₂O₄₀H₁₀{Ni(H₂O)₃}₄]

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