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Tuning the photophysics of Ir(III) and Pt(II) complexes by synthetic modification of quinoxaline ligands

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)
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Status: Unpublished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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