Synthesis and crystal structure of silver–gold sulfide AgAuS. Four-fold interpenetrated three-dimensional [(Au,Ag)10S8]-networks

Crystals of the silver(I) thioaurate(I), AgAuS, were obtained by fusing the elements in stoichiometric amounts. The X-ray diffraction analysis showed that the synthesized phase AgAuS represents a new structural type. The unit cell parameters are a = 13.4235(3), c = 9.0873(4) A, V = 1418.07(6) A3 and Z = 24, and the space group is Rm. The sublattice of sulfur atoms has a strongly distorted body-centered cubic packing. All Au atoms are in a typical linear coordination with sulfur ones. Three-quarters of the silver atoms are surrounded by distorted tetrahedra of sulfur atoms, while the rest of the silver atoms are involved in a linear motif typical of Au atoms as well. The resulting motif is composed of four-fold interpenetrating networks of linearly coordinated metals with 2- and 4-connected sulfur atoms: [Au8[2]Ag2[2]S6(2)S2(4)]. The formula of AgAuS can be represented as Ag24[4][Au8[2]Ag2[2]S8]4. The features of the AgAuS structure suggest the possibility of wide variation in the Au : Ag ratio.

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