Tuning Fluorescence Properties of 2,2’-Bipyridine Using Metal Cations
| dc.contributor.advisor | Redi, Mesfin (PhD) | |
| dc.contributor.author | Guale, Aklilu | |
| dc.date.accessioned | 2018-06-19T14:31:32Z | |
| dc.date.accessioned | 2023-11-09T16:17:35Z | |
| dc.date.available | 2018-06-19T14:31:32Z | |
| dc.date.available | 2023-11-09T16:17:35Z | |
| dc.date.issued | 2010-07 | |
| dc.description.abstract | The steady state absorption, fluorescence excitation and emission spectra of 2,2’-bipyridine have been studied in polar solvents. Absorption spectra are almost independent of solvent polarity. The dependence of fluorescence emission on excitation wavelength was observed in acetonitrile and p-dioxane but independent of excitation energy in tetrahydrofuran. Addition of metal ion and varying pH of the solution shifted the absorption band to the red-edge and intensity change was observed in fluorescence excitation spectra. Corresponding excitation bands of the metal free conformers were compared to the stable conformers of metal-chelated and protonated 2,2’-bipyridine. Study of the rotational profile of 2,2’-bipyridine at DFT/B3LYP/STO-3G level shows two energy minima corresponding to two conformations of different energy, cis/trans structures, with barrier to rotation greater than the room temperature thermal energy. It is shown that distributions of energetically different conformers of the molecule (cis/trans) in the ground state are responsible for the dual fluorescence behavior of the systems. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/1847 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa Universty | en_US |
| dc.subject | 2,2’-Bipyridine | en_US |
| dc.title | Tuning Fluorescence Properties of 2,2’-Bipyridine Using Metal Cations | en_US |
| dc.type | Thesis | en_US |