Date of Award

2014

Document Type

Thesis

First Advisor

Assefa, Zerihun

Abstract

In this study, several new compounds containing N-based donor ligands and group 11 transitions metal complexes were prepared and studied through luminescence, infrared, Raman, and other spectroscopic techniques. The coordinating N containing ligands used in this study were terpyridine (terpy) and phenanthroline (phen) derivatives, and TPAO (triazaphosphaadamantane oxide). TPAO was used to substitute some of the H2O quencher and to probe whether it could also act as an effective sensitizer. The photoluminescence studies show characteristic f-f emissions of the Tb3+ and Eu3+ ions. For the Tb3+ complexes the strongest band (hypersensitive band) was observed ~ 540nm corresponding to the5D4ï‚®7F5 transition, while for Eu3+ complexes the band at 615nm corresponding to the 5D0 → 7F2 transition dominates. The excitation spectra in both systems provides a strong band at 358 nm corresponding to ï°ï€­ï€ ï°* transition the terpy ligand and 380nm for Au(CN)2-. Terpy with phenanthroline derivatives were also explored which yielded four new compounds – [Tb(H2O)4(Au(CN)2)(C22H17N3)(TPAO)]Cl3 (1) ,[Eu(H2O)4(Au(CN)2)(C22H17N3)]Cl3 (2), [Tb(H2O)4(Au(CN)2)(C22H17N3)]Cl3 (3) and [Eu(H2O)4Au(CN)2(Phen)]Cl3 (4). New understanding regarding the mode of interaction is reported as well as spectroscopic data of these complexes.

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