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Ni(SCN) 2 (NH 3 ) 2  and Ni(SCN) 2  are stable intermediates in the course of the thermal decomposition reaction Ni(SCN) 2 (NH 3 ) 4  → NiS 2 . Ni(SCN) 2 (NH 3 ) 2  crystallizes in the monoclinic space group  C 2/ m  with  a  = 8.698(5),  b  = 7.991(4),  c  = 5.619(3) Å,  β  = 105.91(9)°,  Z  = 2,  D x   = 1.85g cm −3 . The crystal data for Ni(SCN) 2  are: space group  C 2/ m ,  a  = 10.476(7),  b  = 3.628(2),  c  = 6.165(5) Å,  β  = 106.89(9)°,  Z  = 2,  D X   = 2.59g cm −3 . The structures were determined from X-ray intensities measured on a four-circle diffractometer and were refined to  R w   = 0.016 for 524 independent observed reflections [Ni(SCN) 2 (NH 3 ) 2 ] and to  R w   = 0.037 for 611 independent observed reflections [Ni(SCN) 2 ]. Ni(SCN) 2 (NH 3 ) 2  exhibits a structure with infinite [unk] chains along [001]. The resulting approximate square planar coordination of nickel by two S and two N atoms is completed to a distorted octahedron by two NH 3  ligands. The infinite chains [unk] are preserved in Ni(SCN) 2  in the course of the thermal decomposition of Ni(SCN) 2 (NH 3 ) 2 . By additional linking of neighbouring chains through [unk] bridges a layer structure (001) results for Ni(SCN) 2 .

Intermediates in thermal decomposition of nickel(II) complexes: The crystal structures of Ni(SCN) 2 (NH 3 ) 2 and Ni(SCN) 2