Structural studies on di-µ-thiocyanato(N,S)-bis(ligand)diisothiocyanato metal(II)bis(triphenylphosphine)mercury(II) and selenocyanate analogs

Abstract

P. P. SIYGH and S. P. YADAV. Can. J . Chem. 57.394(1979) (PPh,) Introduction Pyridine or its derivatives reacts with MHg(XCN), (M = Co(II), Ni(II), Cu(II), Zn(I1); X = S, Se), to yield polymeric bridged complexes (1-4) of the type ) ( X C N ) , (~~) , M ( N C X ) , H <~~ which the ligand is coordinated to M. On account of this, the maximum coordination of M is achieved, but the coordination number of Hg(I1) remains four against the maximum of six. This paves the way to further coordination at this site. It is at this site the triphenylphosphine has been introduced and an entirely new series of mixed-ligand complexes synthesized and studied. Binuclear mixed-metal mixed-ligand monomeric bridged con~plexes o f the type (XCN),-(L),M(I\JCX),Hg Second Method (L),M(NCX), was first prepared by stirring the solution o f M(NCX), in methanol with the excess o f the solution o f the ligand (py or nia) in the same solvent for 6 h . T o the suspension o f Hg(XCN), in methanol, a solution o f PPh, in the same solvent was added in 1 : 2 molar ratio and stirred for 10 h to get (Ph,P)2Hg(XCN),. In each reaction a solid mass was separated which was filtered, washed with the solvent, and dried in cacuo. (L),M(NCX), waa dissolved in a mixture o f methanol and pyridine or nicotinamide. This solution was added to the suspension o f (Ph3P)2Hg(XCN)2 in methanol in Results and DiscussionOn account of the insolubility of these complexes crystals. The structure of the complexes, therefore, have been proposed on the basis of analytical data, of >(XCN),(L),M(NCX)~H~<.