Synthesis, structure, spectroscopic, magnetic and electrochemical studies of NiII phen-dione complex

The first crystal structure of NiII phen-dione complex is reported. This compound is [Ni(bpy)2(phen-dione)](PF6)2 (bpy = 2,2′-bipyridine and phen-dione = 1,10-phenanthroline-5,6-dione). The complex has been characterized by elemental analysis, IR and electronic absorption spectroscopy and cyclic voltammetry. The electrochemical behavior and electronic spectrum of [Ni(bpy)2(phen-dione)](OAc)2 has also been studied in buffered solutions at pH between 1 and 8. ORTEP drawing of [Ni(bpy)2(phen-dione)](PF6)2 · 2CH3CN shows that the coordination geometry around the NiII is a distorted octahedron, with bite angles of 78.1–78.8° for all three bidentate ligands and the two pyridyl rings of the bpy ligands are nearly co-planar, as are the two pyridyl rings of phen-dione.