Synthesis and characterization of tetracarbonyl(6-ferrocenyl-2.2'-bibyridine)tungsten(0) complex

Edinç, Pelin
In this study, a bidentate ligand, 6-ferrocenyl-2,2'-bipyridine, was prepared by the reaction of lithiated ferrocene with bipyridine. The ligand was identified by 1H, 13C- NMR and HMQC and UV-Vis spectroscopies. Then, bidentate molecule was reacted with pentacarbonylbis-(trimethylsilylethyne)tungsten(0). The ligand substitution reaction in CH2Cl2 yielded the new complex, tetracarbonyl(6-ferrocenyl-2,2'bipyridine)tungsten(0). The isolated and purified complex was fully characterized by elemental analysis, IR, UV-Vis, MS, 1H and 13C- NMR spectroscopies. Tetracarbonyl(6-ferrocenyl-2,2'bipyridine)chromium(0) was also formed by ligand substitution reaction of 6-ferrocenyl-2,2'-bipyridine with pentacarbonyl(THF)chromium(0) which was prepared by photolytic substitution of CO from hexacarbonyl chromium(0) in THF. However, tetracarbonyl(6-ferrocenyl-2,2'bipyridine)chromium(0) could not be isolated by column chromatography. Electrochemistry of 6-ferrocenyl-2,2'-bipyridine and tetracarbonyl(6-ferrocenyl-2,2'bipyridine)tungsten(0) was studied by cyclic voltammetry and controlled potential electrolysis combined with UV-Vis. The ligand exhibits a reversible reduction and a reversible oxidation belonging to bipyridine and ferrocene moieties, respectively. One reversible reduction, two irreversible oxidation and a reversible oxidation were observed for tetracarbonyl(6-ferrocenyl-2,2'bipyridine)tungsten(0). The reversible reduction was attributed to bipyridine whereas two irreversible oxidations were assigned to tungsten centers and reversible oxidation to iron center.
Citation Formats
P. Edinç, “Synthesis and characterization of tetracarbonyl(6-ferrocenyl-2.2′-bibyridine)tungsten(0) complex,” M.S. - Master of Science, Middle East Technical University, 2005.