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Sc(5)Ni(2)Te(2): Synthesis, Structure, and Bonding of a Metal-Metal-Bonded Chain Phase, a Relative of Gd(3)MnI(3)
Paul A. Maggard1, John D. Corbett
1Department of Chemistry, Iowa State University, Ames, Iowa 50011.
Abstract:
Sc(5)Ni(2)Te(2) has been prepared by high-temperature solid-state techniques and the structure determined at 23 degrees C by single crystal and powder X-ray diffraction methods to be orthorhombic, Pnma (No. 62) with Z = 4, a = 17.862(1) Å, b = 3.9533(3) Å, c = 10.6398(6) Å. The structure contains pairs of eclipsed zigzag chains of nickel atoms that are sheathed by scandium atoms and demarcated from other chains by tellurium atoms. The structure is isotypic with that of Hf(5)Co(1+)(x)()P(3)(-)(x)(), but shifted atomic positions and a different ordering of the main group and late transition elements give it a clearly 1D character. The differences in dimensionality, ordering, and bonding are discussed, and comparisons are made with Gd(3)MnI(3) and rare-earth-metal cluster halides in general.
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