Thiocyanates of nickel and caesium: Cs2NiAg2(SCN)6.2H2O and CsNi(SCN)3.

The crystal structures of dicaesium nickel disilver hexathiocyanate dihydrate, Cs2NiAg2(SCN)6.2H2O, (I), and caesium nickel trithiocyanate, CsNi(SCN)3, (II), have been determined by single-crystal X-ray diffraction at 273 K. Compounds (I) and (II) are monoclinic, with P21/c and P21/n symmetry, respectively. In (I), the Ni atom lies on an inversion centre; in (II), there are two independent Ni atoms, each of which lies on an inversion centre. The coordination polyhedra and the bonding schemes in the structures are discussed.