Fitzgerald, Sophie
2023.
Tuning the photophysics of Ir(III) and Pt(II) complexes by synthetic modification of quinoxaline ligands.
PhD Thesis,
Cardiff University.
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Abstract
The work presented in this thesis focuses on the development and analysis of organic ligands primarily derived from 2-phenylquinoxaline, and their resultant Ir(III) and Pt(II) phosphorescent complexes. Through efficacious ligand design, their desirable photophysical properties offer potential applications in a multitude of areas including OLED development and biological imaging. Chapter 2 explores the impact of altering the nature and position of electron�donating and electron-withdrawing substituents at the cyclometallating ligand to form a series of Ir(III) complexes. Fine tunability of the emission wavelength within the yellow to deep-red regions of the visible range was achieved. Chapter 3 investigates long-range electron-withdrawing substituents at varying positions on the phenyl ring of the cyclometallated ligand system, and their resultant impact on the electronic and structural properties of a series of neutral square planar Pt(II) complexes. Comparisons were made with Ir(III) analogues and the complexes were also investigated as photosensitisers for TTA-UC. Chapter 4 describes the development of deep-red emitting Ir(III) complexes with 2-thienyl quinoxaline type ligands. Absorption and emission properties were monitored, where both subtle and prominent tunability was observed. Chapter 5 focused on the utilisation of pendant naphthalimide units at the extremities of Ir(III) complexes to initiate triplet-triplet energy transfer mechanisms for the development of long-lived phosphorescent species. Chapter 6 explored the synthesis of a novel pyrene-based quinoxaline ligand system and its resultant Ir(III) complex – monitoring the impact on spectroscopic properties upon direct cyclometallation to a pyrene unit.
Item Type: | Thesis (PhD) |
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Date Type: | Completion |
Status: | Unpublished |
Schools: | Chemistry |
Date of First Compliant Deposit: | 17 October 2023 |
Last Modified: | 17 Oct 2023 10:26 |
URI: | https://orca.cardiff.ac.uk/id/eprint/163226 |
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