Structure of Ni[Ag(SCN)2]2•2diox and its derivatives

Abstract

Ni[Ag(SCN)2]2•2diox and its derivatives have been synthesized. Their structures have been given on the basis of infrared spectral, electronic spectral, magnetic moment, and molar conductance studies. These results demonstrate that Ni[Ag(SCN)2]2 forms two types of complexes: (i) cationic–anionic type of general formula [NiLx]2+[Ag(SCN)2]22− (x = 3, 4, 6) and (ii) polymeric bridged type having a chain structure consisting of zig-zag thiocyanate bridges between nickel and silver. The cationic–anionic type of complexes are formed by pyridine, nicotinamide, 4-aminopyridine, aniline, p-toluidine, thiourea, ethylene thiourea, bipyridine, phenanthroline, pyrazine-2,3-dicarboxamide, and triphenylphosphine, and the polymeric bridged type by dioxane, acetone, and dimethylformamide. All the ligands have been found to prefer to coordinate to nickel instead of silver.