Synthesis and Structure of a Binuclear [Bis(ethane-1,2-diamine)nickel(II)]-μ-(ethane-1,2-dithiolato)-[(ethane-1,2-dithiolato)Nickel(II)] Complex [Ni(en)₂(μ-C₂O₂S₂)Ni(C₂O₂S₂)], and the Related 3,4-Dimercaptocyclobutene-1,2-dionato Complex

Abstract

The reaction of planar bis nickel(II) chelates of the ethanebis ( thioate ) ( dithiooxalate ) dianion (C₂O₂S₂^2-, dto ) or the 3,4-dimercaptocyclobutene-1,2-dionate(2-)( dithiosquarate ) dianion (C₄O₂S₂^2-, dts ) with bis (ethane-1,2-diamine)nickel(II) dinitrate [Ni^II (en)2(NO₃)₂ ]leads to the formation of neutral binuclear complexes of the form [Ni(en)₂Ni(L)₂] (L= dto or dts ), (1) and (2). An X-ray crystal structure of the dithiooxalate complex has been performed which confirms the formulation of a μ- dithiooxalato bridged binuclear complex based on analytical, magnetic and spectroscopic data. The crystals of [Ni(en)₂Ni( dto )₂] are orthorhombic, space group Pcnn a 8.371(8), b 17.65(1), c 23.37(2)Ǻ and Z 8; a total of 853 unique data with I > 2σ(I) were refined to R 0.073. The molecule is found to be binuclear with a dithiooxalate dianion bridging a six-coordinate Ni(en)₂O₂ moiety and a planar four-coordinate Ni( dto )S₂ group.