Synthesis and characterization of new binuclear complexes mercury(II) of pyridiniumylide obtained from 2-Bromo-4ʹ-fluoroacetophenone

Pyridinium ylides are important reagents in organic chemistry, especially in the synthesis of naturally occurring products with biological and pharmacological activities[1]. These compounds have been used as reducing agents in coordination chemistry. They can behave as ambidentate ligands because the carbanion located at the Cα of the ylide or the enolate oxygen is able to donate electron density to a transition metal [2]. Herein, we report the synthesis and characterization of new binuclear complexes of Hg(II) derived from pyridinium ylide C5H5NCHC(O)C6H4-p-F (Y). Pyridine and 2-Bromo-4-fluoro acetophenone in a 1:1 ratio react in acetone as a solvent to produce the related pyridinium salt. For synthesis ylide, a solution of potassium carbonate in water was added to a solution of pyridinium salt in water. The mixture was stirred for 30 min and then extracted with dichloromethane. The reaction of Y with HgX2(X = Cl, Br and I) in 1:1 ratio leads to binuclear products of the type [HgX2(Y)]2. Characterization of the complexes by IR, 1H and 13C NMR spectroscopy confirmed coordination of the ylide to the metal through the carbon atom.