Synthesis and structure of(1,3-dimethyluracil-5-yl)mercury(II) complexes with aromatic nitrogen donor ligands

Reactions of(1,3-dimethyluracil-5-yl) mercury(II) acetate with the heterocycles 1,8-naphthyridine (napy) and 2,2'-bipyridyl (bpy) yield compounds of general composition [Hg(1,3-DimeU-CS) (heterocycle)] (+). Two examples, [Hg(1,3-DimeU-CS) (napy)] (NO3). H2O (1) and [Hg(1,3-DimeU-CS) (bpy)](ClO4) (4) were crystallized and studied by X-ray crystallography and NMR spectroscopy. H-1 and Hg-199 NMR data on the one hand and X-ray data on the other reveal differences in the mode of coordination for napy mercury complexes in water and in the solid state. While both napy and bpy act as chelating Ligands in solution, napy behaves as a monodentate Ligand in the solid state. (C) 1998 Elsevier Science S.A. All rights reserved.