Ag5PS4Cl2 and Ag15(PS4)4Cl3 – Crystal structures and their relation to Ag3PS4

Ag5PS4Cl2 and Ag15(PS4)4Cl3 are two new light green solids, which are characterized by single-crystal X-ray crystallography. Ag5PS4Cl2 crystallizes in the orthorhombic system (Amm2; Z = 2; a = 7.409(1) Å, b = 11.143(2) Å, c = 6.258(1) Å). The crystal structure consists of chains of corner-sharing tetrahedra running along [100] and built up by S2− and Cl− ions. The tetrahedra are centered alternately by phosphorus (four S neighbors) and Ag1 atoms (two S and two Cl). The contact with the chains is achieved via Ag2 ions, which are located a little bit outside of a triangular plane formed by S2− and Cl− ions. Ag15(PS4)4Cl3 crystallizes in the space group I4¯3d (a = 14.838(4) Å; Z = 4). The main features of the crystal structure are the almost ideal PS4 and Ag(1)S4 tetrahedra, whereas the tetrahedral coordination of the Ag2 atoms built up by one Cl− and three S2− ions is markedly distorted. Concerning the arrangements of the tetrahedra both crystal structures show relationships to Ag3PS4 (enargite type), whose crystallographic data are given too in this paper.

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