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The Lu 3 Co 2 In 4 -type stannides  RE   3 Ir 2 Sn 4  ( RE  = Y, Sm, Gd–Tm, Lu) were synthesized from the elements by arc-melting and subsequent annealing sequences in sealed silica ampoules. For a more comprehensive phase analytical study, the isotypic stannide Sm 3 Rh 2 Sn 4  and the ZrNiAl-type stannides DyIrSn and LT-YIrSn were also obtained. The polycrystalline samples were characterized through their X-ray powder patterns. The structures of DyIrSn and Gd 3 Ir 2.63(2) Sn 3.37(2)  (ZrNiAl type, space group  P 6‾2 m ), Sm 3 Ir 2.52(2) Sn 3.48(1) , Gd 3 Ir 2.49(1) Sn 3.51(1)  and Tm 3 Ir 2.20(3) Sn 3.80(3)  (Lu 3 Co 2 In 4  type, space group  P 6‾) were refined from single-crystal X-ray diffractometer data, revealing residual Ir/Sn disorder in the low-symmetry variants. The  RE   3 Ir 2 Sn 4  stannides are derived from the equiatomic stannides  RE IrSn (≍ RE   3 Rh 3 Sn 3 ) by partial Ir/Sn substitution. The symmetry reduction from space group  P 6‾2 m  to  P 6‾ is forced by the Ir/Sn ordering within the  RE   6  trigonal prisms. The new Sn2 position shows the rare motif of a trigonal planar tin coordination with 289 pm Sn2–Sn1 distances (data for Gd 3 Ir 2.49(1) Sn 3.51(1) ).  119 Sn Mössbauer spectra confirm the two crystallographically independent tin sites in Tm 3 Ir 2 Sn 4  and the structural disorder in Gd 3 Ir 2 Sn 4 .

DyIrSn and the Lu 3 Co 2 In 4 -type stannides Sm 3 Rh 2 Sn 4 and RE 3 Ir 2 Sn 4 ( RE = Y, Sm, Gd–Tm, Lu)