Redetermination of AgNb2PS10 revealing a silver deficiency

• Published in: Acta crystallographica. Section E, Structure reports online Structure reports online, 2009-08, Vol.65 (Pt 8), p.i56-i57
• Main Authors: Do, Junghwan, Yun, Hoseop
• Format: Article
• Language: English
• Subjects: Inorganic Papers
• ISSN: 1600-5368; 1600-5368
• DOI: 10.1107/S1600536809025100

In comparison with a previous crystallographic study [Goh et al. (2002 ▶ ). J. Solid State Chem. 168 , 119–125] of the title compound, silver diniobium tris­(disulfide) tetra­thio­phosphate(V), that reports a full occupation of the silver position and isotropic displacement parameters for the atoms, the current redetermination reveals a silver deficiency with a site-occupation factor of 0.88 (1) and reports all atoms with anisotropic displacement parameters. The structure of Ag 0.88 Nb 2 PS 10 is composed of ∞ 1 [Nb 2 PS 10 ] chains, which are built up from pairs of distorted bicapped trigonal-prismatic [NbS 8 ] polyhedra forming [Nb 2 S 12 ] dimers and of tetra­hedral [PS 4 ] groups. These chains are connected via the statistically disordered Ag + ions, forming double layers. Adjacent layers are stacked solely through van der Waals forces into a three-dimensional structure. Short and long Nb—Nb distances [2.880 (1) and 3.770 (2) Å, respectively] alternate along the chain and S 2 2− and S 2− anionic species are observed.