Ag3AsSe3 crystallizes in the trigonal R3c space group. The structure is three-dimensional. Ag1+ is bonded in a 3-coordinate geometry to three equivalent Se2- atoms. There are a spread of Ag–Se bond distances ranging from 2.58–2.85 Å. As3+ is bonded in a distorted trigonal non-coplanar geometry to three equivalent Se2- atoms. All As–Se bond lengths are 2.46 Å. Se2- is bonded in a 4-coordinate geometry to three equivalent Ag1+ and one As3+ atom.
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