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A novel compound with the formula [Na2(H2O)10](NH4)3(NH3)[MoV9O28] has been synthesized for the first time and characterized by single crystal X‐ray diffraction, infrared spectrum, UV spectrum, element analysis and ICP analysis. The complex crystallizes in the triclinic space group P-1, with a=0.864 5(4) nm, b=1.044 8(4) nm, c=1.122 7(5) nm, α=69.245(6)°, β=87.224(6)°, γ=66.762(5)° and Z=1. The structure of the anion [MoV9O28]5- has a molybdenum atom mixing with nine vanadium atoms at certain positions in the similar backbone of the decanucleus structure. [ABSTRACT FROM AUTHOR]

A new complex with the formula [Na(H 2 O) 2 ] 6 [MoCo 6 O 12 (H 2 O) 12 ] · 4.3H 2 O has been synthesized and characterized by single crystal X‐ray diffraction, thermal study, infrared spectrum. The complex is rose rhombic crystal and space group R‐3 m with a=11.9396(15) Å, b=11.9396(15) Å, c=22.995(3) Å, α=90°, β=90°, γ=120°, V=2838.9(9) Å 3 , Z=3, and R 1 =0.0612. The structure of the anion [MoCo 6 O 12 (H 2 O) 12 ] 6- has a hexagonal plane structure composed of a central Mo ion surrounded by six octahedron CoO 6 groups. Each CoO 6 shares an edge with each of its two neighboring CoO 6 and another edge with the MoO 6 octahedron. This is similar to the Anderson‐type strucure. This new complex is colbaltmolybdate described. [ABSTRACT FROM AUTHOR]