Potassium thiocyanate argentates: K3[Ag(SCN)4], K4[Ag2(SCN)6] and K[Ag(SCN)2]

The anions of the title compounds contain Ag(SCN)₄] units, with the S atoms coordinating to Ag⁺ in a tetrahedral arrangement. Whereas in the isolated anions of tripotassium tetra­thio­cyanatoargentate(I), K₃Ag(SCN)₄], (I), all SCN^? groups are bonded as terminal ligands, in tetrapotassium di‐μ‐thio­cyanato‐S:S‐bis­dithio­cyanato­argentate(I)], K₄Ag₂(SCN)₆], (II), two AgS₄ tetrahedra share one common edge. In polypotassium argentate(I)‐di‐μ‐thio­cyanato‐S:S]], KAg(SCN)₂], (III), edge‐ and vertex‐sharing of AgS₄ tetrahedra results in infinite Ag(SCN)₂]^? layers.