Chapter One: Gives a general introduction the history of, and types of, luminescence and the non-radiative processes that result from the absorption of light. It gives an introduction about the generation of Ir(III), Re(I) and Os(II) emission according to the electronic transitions. This chapter also includes the principles of energy transfer between two metal centres that are linked together through bridging ligands and the effect of such ligands on the energy transfer. Finally, it gives the importance of using these metal complexes as probes in cell imaging as some of the prepared complexes in this thesis have been used in cell imaging. Chapter Two: Deals in detail with the luminescent cyclometalated mononuclear Ir(III) complexes starting from their syntheses and the general formula to their emission tuning by changing the coordinating ligands. By this modification, different mononuclear Ir(III) complexes with colours covering the visible region could be obtained. This chapter also shows the generation and the importance of blue emission cyclometalated mononuclear Ir(III) complexes in energy transfer to other metal centres, in the fabrication of OLEDS and in cell imaging. It also shows the syntheses of the bridging ligands based on 3-(2-pyridyl)pyrazole and their complexes with cyclometalated Ir(III) complexes and how these different ligands affect the complexes photophysical properties. These Ir3+ complexes were used as starting materials to synthesize the dinuclear Ir/Re and Ir/Os complexes in chapter 3 and 4 respectively. Chapter Three: Gives a general introduction about the optical properties of mononuclear [Re(CO)3(diimine)L] complexes, where L is a halogen, and the effect of swapping this ligand with neutral monodentate ligands such as pyridine on the photophysical properties such as the emission and the quantum yields. This chapter also shows the energy transfer in other complexes containing Ir and Re such as Ir/Ru and Ru/Re dyads and comparing them with the energy transfer in the Ir/Re system. Furthermore, this chapter deals with the syntheses of the dinuclear Ir/Re complexes from the prepared mononuclear Ir3+ complexes in chapter 2. The synthesis was followed by obtaining the crystal structure of some of these dyads. Moreover, their photophysical properties were studied, including the absorption, emission, excitation, (aerated and degassed) lifetime, quantum yields and extinction coefficients. The energy transfer between Ir? Re was studied with the effect of the bridging ligands and the solvents. Chapter Four: Includes an introduction to the optical properties of mononuclear 2,2- bipyridine Os(II) complexes with different diimine ligands. Also it shows the energy transfer in Ir/Ru systems and comparing it with the energy transfer in Ir/Os systems. This chapter also shows the syntheses of mononuclear [Os(2,2-bipyidine)2Cl2] complexes with 3-(2-pyridyl)pyrazole containing ligands and their Ir/Os dyads. This chapter involves the photophysical studies of the mononuclear osmium complexes and the dyads. The energy transfer from Ir?Os was studied also and was compared with that shown in Ir/Re dyads. Chapter Five: Explains the procedures that were used to synthesize the new ligands, all mononuclear complexes and all the dyads. It also shows the instruments that have been used to characterize and purify all the prepared compounds. This chapter also contains table for the crystal structure data of some complexes.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:722801 |
| Date | January 2017 |
| Creators | Saad, Suad |
| Contributors | Ward, Michael |
| Publisher | University of Sheffield |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://etheses.whiterose.ac.uk/18223/ |
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