Nickel(II) and Copper(II) Dicyanoargentate Complexes with Ethylenediamine and 4,4'-Bipyridyl Ligands

The reactions of an aqueous solution of potassium dicyanoargentate with a mixture of nickel(II) or copper(II) chloride and ethylenediamine or 4,4'-bipyridyl in ethanol afford coordination polymers [Ni(Еn) 2 (Ag(CN) 2 )][Ag(CN) 2 ] ( I ), [Cu(Еn) 2 (Ag(CN) 2 )][Ag(CN) 2 ] ( II ), and [Cu(4,4'-Вipy) 2 (Ag(CN) 2 ) 2 ] ( III ) characterized by XRD (CIF files CCDC nos. 2225984 ( I ), 2214320 ( II ), and 2229270 ( III )) and IR spectroscopy. According to the XRD data, the crystals of complexes I and II are formed by 1D chains {··NC–Ag–CN–M(Еn) 2 ··} n (M = Ni ( I ), Cu ( II )) linked with each other by the dicyanoargentate anions via argentophilic contacts (Ag···Ag 3.288(8) Å ( I ), 3.1616(14) Å ( II )). The crystal of compound III consists of independent interpenetrating 3D networks built of polymer layers {Cu[Ag(CN) 2 ] 2 } n bound to each other by the 4,4'-bipyridyl molecules. The bipyridyl linkers connect the Cu centers with the Ag centers of the [Ag(CN) 2 ] – anions thus providing the tridentate coordination of the silver atoms. No Ag···Ag interactions are observed in the crystal of complex III .