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The antimonides Ce 2 Ir 3 Sb 4 , La 2 Ir 3 Sb 4 , and Ce 2 Rh 3 Sb 4  were synthesized by solid state reaction from the elements. The crystal structures of these compounds were determined from single crystal X-ray diffraction data. Ce 2 Ir 3 Sb 4  crystallises in a new structure type in the space group  Pnma  (no. 62) with  a  = 16.1510(8) Å,  b  = 4.5600(3) Å,  c  = 10.9463(5) Å. La 2 Ir 3 Sb 4  and Ce 2 Rh 3 Sb 4  crystallise in the Ce 2 Ir 3 Sb 4  structure type as well with  a  = 16.2659(10) Å,  b  = 4.5896(3) Å,  c  = 10.9996(7) Å) and  a  = 16.2293(8) Å,  b  = 4.5604(2) Å,  c  = 10.9804(5) Å, respectively. The four- and five-bonded transition metal atoms and three- and four-bounded Sb atoms form a 3D-network with the rare-earth metal embedded in its cavities, resembling the topology of Ca in the CaBe 2 Ge 2  or Th in ThCr 2 Si 2  type. Magnetic susceptibility and X-ray absorption near edge spectroscopy data indicate a stable trivalent state for Ce in the Ce 2 Ir 3 Sb 4  compound.

Crystal structure, chemical bonding and magnetic properties of the new antimonides Ce 2 Ir 3 Sb 4 , La 2 Ir 3 Sb 4 , and Ce 2 Rh 3 Sb 4