Synthesis, characterization and theoretical studies of three binuclear Hg(П) complexes of a new pyridiniumylide

Phosphonium and sulphoniumylidesstabilization is achieved by the overlap of the formal carbanionic electron pair with the vacant d-orbitals of the adjacent heteroatom. However, in analogous nitrogen compounds such stabilization cannot occur, and consequently most N-ylids are capable of only fleeting existence[1].Following our interest in Hg(II) complexes of various types of ylides [2,3], herein we report the synthesis and characterization of three binuclear Hg(II) complexes. At the first stage, anewpyridinium saltwas synthesized by addition of 4-benzoylpyridine to benzylbromoacetate. Further treatment with NH3 gave the new pyridiniumylide,PhC(O)PyCHC(O)OCH2Ph, which is stabilized with a conjugated carbonyl group. The reaction of this ylide with HgX2 (X=Cl, Br and I) in equimolar ratio using dry methanol as solvent led to the formation of dimeric complexes of the type [(ylide)HgX2]2 (X= Cl, Br, I).Characterization of the obtained compounds was performed by elemental analysis and IR, 1H, and 13C NMR spectroscopic methods.