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

Abstract

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) Å, V = 1418.07(6) Å 3 and Z = 24, and the space group is R3 ¯m. 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: [Au 8 [2] Ag 2 [2] S 6(2) S 2]. The formula of AgAuS can be represented as Ag 24[4][Au 8 [2] Ag 2 [2] S 8 ] 4 . The features of the AgAuS structure suggest the possibility of wide variation in the Au : Ag ratio.

Isomorphism and solid solutions among Ag- and Au-selenides

“…Cubic fischesserite structure Ag 3 AuSe 2 [2], space group I4 1 32, contains triatomic linear Se-Au-Se groups and Ag atoms surrounded by four Se atoms. The coordination formula (in the formal ionic representation) is Ag 3 [4] Au [2] S 2 (7) where the coordination number of the cations is enclosed in brackets and that of the anions in parentheses. Fig.…”

Modulated Triple‐Material Nano‐Heterostructures: Where Gold Influenced the Chemical Activity of Silver in Nanocrystals

“…Elemental analysis (Figure S3, Supporting Information) also supports their alloyed‐type composition of these nanostructures. Partial sulfurization of Ag(0) particles turning to Ag‐Ag 2 S alloyed material heterostructures is widely known . Figure c,d shows the TEM and HRTEM images of these Au‐treated bimetallic and binary alloyed semiconductor heterostructures.…”

The crystal structure of uytenbogaardtite, Ag3AuS2, and its relationships with gold and silver sulfides-selenides

“…This disagreement is explained by the presence of AgAuS ( petrovskaite) inclusions in the synthetic sample. A minor portion of this compound could affect the crystal data due to topotactic intergrowth of the two structures with similar anion sublattices (Seryotkin et al, 2014).…”

“…Three fourths of Ag + cations form a tetrahedral framework in rhombohedral petrovskaite, AgAuS. The linear groups S-(Au,Ag)-S form four interpenetrating three-dimensional networks (Seryotkin et al, 2014). The number of Au cations alone is not enough to form the networks, so a fourth part of Ag + has linear coordination.…”