Synthesis and Structure of Tetra( para -tolyl)antimony Dicyanodiiodoaurate [ p -Tol 4 Sb][Au(CN) 2 I 2 ] and Alkyltriphenylphosphonium Dicyanodiiodoaurates [Ph 3 PAlk][Au(CN) 2 I 2 ], Alk = Me, CH 2 CN

Red-colored crystalline gold complexes [p-Tol4Sb][Au(CN)2I2] (I), [Ph3PMe][Au(CN)2I2] (II), and [Ph3PCH2CN][Au(CN)2I2] (III) were synthesized by the reaction of potassium dicyanodiiodoaurate with tetra(para-tolyl)antimony and alkyltriphenylphosphonium halides in water. The structure of the complexes was established by IR and NMR spectroscopy and X-ray diffraction. The tetra(para-tolyl)antimony and alkyltriphenylphosphonium cations have a distorted tetrahedral coordination. The dicyanodiiodoaurate anions have a planar structure with a square coordination of the gold atom. The formation of the 3D crystal network is due to weak CN⋅⋅⋅H−C hydrogen bonds between cations and anions (2.39, 2.59 A (I), 2.70, 2.48, 2.52, 2.68 A (II), 2.73, 2.50, 2.67, 2.44 A (III)). In complex III, anions of one of the two types interact with one another via I⋅⋅⋅I contacts to give 1D ladder-like chains along the crystallographic a axis.