Abstract
Abstract The title compounds were reinvestigated by single crystal X-ray diffraction. They crystallize with the ordered NdPtSb type structure (space group P63 mc) rather than with the disordered CaIn2 type structure (space group P63/mmc) as reported previously. Cell parameters for NdCuSn: a = 4.5705(10) Å, c = 7.662(4) Å, c/a = 1.68; SmCuSn: a = 4.5515(9) Å, c = 7.461 (4) Å, c/a = 1.64; and GdCuSn: a = 4.5341(11) Å, c = 7.363(3) Å, c/a = 1.62. The Cu–Sn distances between the [CuSn] polyanions (3.42 Å (Nd), 3.19 Å (Sm), 3.11 Å (Gd)), scale with the size of Ln atoms, while those within the anions remain nearly unchanged (2.67 Å (Nd), 2.68 Å (Sm), 2.68 Å (Gd)).
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