Synthesis, Structure, and Properties of Ag₅Se(PO₄) and Ag₅Te(PO₄) with Two‐Dimensional Framework Trapping PO₄^3– anions

Abstract

New compounds Ag 5 Se(PO 4 ) and Ag 5 Te(PO 4 ) have been synthesized as black air-stable polycrystalline powders, and their structures determined from X-ray powder diffraction data. The two new compounds are isostructural and crystallize in the space group P4/nmm (No. 129) with the unit cell parameters a ϭ 6.8886(5), c ϭ 7.2724(7) Å , Z ϭ 2 and a ϭ 7.0098(5), c ϭ 7.3423(7) Å , Z ϭ 2, respectively. Their crystal structures comprise a positively charged silverϪchalcogen framework and separate tetrahedral PO 4 3Ϫ ions.

Synthesis and Structure of Ag4Te(SO4) – a New Compound Featuring a Silver‐Telluride Framework

“…However, the accuracy is quite sufficient to notice that the arrangement of the framework is virtually the same in both compounds. Also for comparison, it is worth noting the crystal structure of Ag 5 Te(PO 4 ) (having a selenium analogue) 16, which features the 2D silver‐telluride framework that captures guest PO 4 3– anions. In this compound, tellurium atoms are surrounded by eight silver atoms ( d = 2.69–2.99 Å) forming an irregular coordination polyhedron; the manifold Ag–Ag contacts (2.89–3.23 Å) complete the framework structure.…”