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.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12606594/index.pdf |
| Date | 01 September 2005 |
| Creators | Edinc, Pelin |
| Contributors | Ozkar, Saim |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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