Preparation and Structure of Tetraphenylarsonium Tris(1,2-dicyanoethenedithiolato)technetate(IV)

Abstract

The reaction of sodium 1,2-dicyanoethenedithiolate [( mnt )Na₂] with (NH₄)₂ [TcBr₆] in ethanol yields crystals of (AsPh₄)₂ [ Tc ( mnt )₃] (1) after precipitation with AsPh₄Cl. The crystal structure of (1) has been determined by X-ray diffraction. Crystals are orthorhombic, space group Pbcn , a 20.256(1), b 15.513(1), c 18.274(1)Ǻ, Z 4. Refinement on 2910 diffractometer data measured with Cu Kα radiation converged at R 0.056. The structure consists of [ Tc ( mnt )₃]^2- anions and (AsPh₄)⁺ cations . The technetium(IV) atom is coordinated to six sulfur atoms to give a distorted octahedron.