Abstract
The stannides Li8Rh7Sn8 and Li1.23Rh1.77Sn were synthesized from the elements in sealed niobium ampoules. The structures were refined on the basis of single crystal X-ray diffractometer data: MnCu2Al type (Heusler phase), Fm-3m, a = 615.5(4) pm, wR2 = 0.0319, 106F2 values, 6 variables for Li1.23Rh1.77Sn and P-3m1, a = 894.4(4) pm, c = 1107.3(4) pm, wR2 = 0.0600, 1287F2 values, 48 variables for Li8Rh7Sn8 which crystallizes with a new structure type. The rhodium site in Li1.23Rh1.77Sn shows Rh/Li mixing. The structure of Li8Rh7Sn8 contains two pronounced structural motifs. Layers of edge-sharing RhSn6 octahedra alternate with layers of six-membered rings of corner-sharing SnRh4 tetrahedra in UDUDUD orientation. The [Rh7Sn8]δ– polyanionic network is characterized by covalent rhodium-tin bonding.
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