Abstract
The compound Na 3AuS 2 was prepared by the reaction of a stoichiometric mixture of Na 2S, gold and sulphur at 600 °C. Transparent, colourless crystals were obtained by slowly cooling the melt. Na 3AuS 2 crystallizes in the space group R 3 ̄ c with a = 7.623(2) A ̊ , c = 16.672(5) A ̊ , Z = 6. The crystal structure was determined from four-circle diffractometer data and refined to a conventional R value of 0.047 for 211 observed reflections. Na 3AuS 2 crystallizes in a new structure type, which is characterized by discrete linear [S-Au-S] 3−]-anions, oriented along [001]. The sodium cations are surrounded by four sulphur atoms in a distorted tetrahedral coordination. The structure of Na 3AuS 2 can be derived from a b.c.c. packing of sulphur atoms, which is described as a space-filling arrangement of distorted sulphur tetrahedra. The sodium ions occupy one quarter of the tetrahedral sites, while the gold atoms are situated on edges. The structure is compared with that of the corresponding silver compound Na 3AgS 2.
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