A New Rare-Earth Indium Antimonide, (RE)In<sub>1</sub><sub>-</sub><i><sub>x</sub></i>Sb<sub>2</sub> (RE = La−Nd), Featuring In Zigzag Chains and Sb Square Nets
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A new series of ternary rare-earth indium antimonides, (RE)In1-xSb2 (RE = La−Nd), has been synthesized through reaction of the elements at 950 °C. The structure of LaIn0.81(1)Sb2 has been determined by single-crystal X-ray diffraction (monoclinic space group -P21/m, Z = 2, a = 4.521(3) Å, b = 4.331(3) Å, c = 11.913(7) Å, β = 99.6680(11)°). The structure is built up of alternating layers of compositions and separated by the La atoms. The layer is described as a nearly square net of Sb atoms held by weak one-electron bonds, while the layer is derived from edge-sharing InSb4 tetrahedra distorted in such a way as to produce In−In zigzag chains. Extended Hückel band structure calculations are used to explain the bonding and predict that anisotropic metallic behavior should be observed.
