Synthesis and Characterization of bis-(diimine)-Carbonyl- Osmium(II) Chloride and Triphenylphosphine Complexes
Elise G. Megehee, Department of Chemistry, St. John’s College of Liberal Arts and Sciences
As a part of an ongoing project on the synthesis and spectroscopic studies of osmium compounds with interesting electrochemical and luminescence properties, my students and I have synthesized numerous complexes with a variety of ligands to explore the generality of the osmium triflate intermediate and to study how ligand variations affect the electronic properties of the systems. All of these complexes contain the bis-(diimine)-carbonyl osmium(II) moiety and use a triflate intermediate as the starting point for this chemistry. We have synthesized a series of chloride and triphenylphosphine osmium complexes of nine substituted diimines. We will discuss the synthesis and characterization of these compounds by cyclic voltammetry, 1H, 13C, 31P NMR, infrared, UV-visible absorbance and emission spectroscopies. We will discuss our conclusions about the effect of this ligand variation on the electronic properties of these compounds.