A previously unknown modification of dicopper(I) triselenostannate(IV), Cu(2)Se(3)Sn, has been obtained from the Cu(2)Se-SnSe(2) quasi-binary system and investigated using X-ray single-crystal diffraction. The Se atoms are stacked in a closest-packed arrangement with the layers in the sequence ABC. The Cu atoms occupy one-third of the tetrahedral interstices, whereas the Sn atoms are located in one-sixth of the tetrahedral interstices. All the atoms occupy general positions. The structure possesses pseudo-inversion symmetry. The Cu(2)Se(3)Sn structure investigated in this paper (96 atoms per unit cell, ordered distribution of Cu and Sn over 12 cation positions) is a superstructure of the reported cubic (eight atoms per unit cell, random distribution of Cu and Sn over one cation position) and monoclinic (24 atoms per unit cell, ordered distribution of Cu and Sn over three cation positions) modifications.
Monoclinic Cu 2 Se 3 Sn. -Single crystals of a new monoclinic modification of Cu2Se3Sn are obtained from the elements at 1380 K (evacuated silica tube, 2 h). The structure of the present polymorph (space group Cc, Z = 16) is a superstructure of the cubic and monoclinic modifications reported earlier. The eight independent Cu atoms and four independent Sn atoms occupy one-third and one-sixth of the tetrahedral holes, resp., in a pseudo-close-packed Se lattice. The cation positions are fully ordered. -(GULAY, L. D.; DASZKIEWICZ*, M.; OSTAPYUK, T. A.; KLYMOVYCH, O. S.; ZMIY, O. F.; Acta Crystallogr., Sect. C: Cryst. Struct. Commun. 66 (2010) 5, i58-i60, DOI:10.1107/S0108270110014034; Trzebiatowski Inst. Low Temp. Struct. Res., Pol. Acad. Sci., PL-50-950 Wroclaw, Pol.; Eng.) -Schramke 32-007
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