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Development of Luminescent iridium(III) and Rhenium(I) complexes for optoelectronic applications

Phillips, Kaitlin 2019. Development of Luminescent iridium(III) and Rhenium(I) complexes for optoelectronic applications. PhD Thesis, Cardiff University.
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Abstract

metal complexes. These species are of importance due to the wide range of applications which will be discussed in further detail throughout this work. There is a clear need for the development of new red-emitting species which are of particular interest in the fields of OLEDs and bioimaging. Chapter 2 describes the effect of cyclometallating ligand substitution upon the photophysical properties of cationic iridium(III) complexes with an ancillary 2,2’-bipyridine ligand. A series of cyclometallating ligands based upon quinoxaline were synthesised and functionalised with electron withdrawing and donating groups. It was found that substitution was an effective method for the fine-tuning of emission wavelength and that the methylated species synthesised were excellent triplet-triplet annihilation upconversion donors. Chapter 3 utilises the same cyclometallating ligands from chapter two and describes the effect of ancillary ligand upon the overall photophysical properties. Picolinic acid and pyrazinoic acid were used as ancillary ligands to give a series of eleven novel complexes which all showed red emission and increased the total tuning range of emission wavelength. Chapter 4 describes the effect of conjugation upon the emission of cationic iridium(III) complexes. Four novel bis-cyclometallated iridium(III) complexes were synthesised with a series of benzo[g]quinoxaline ligands. Results showed near-infrared emission comparable to previous reports in literature but also showed visible green emission which previous reports has not observed. Chapter 5 describes the synthesis of four novel organic lumophores based upon a dicyanodibenzodioxin structure. It was shown that emission from these species is dominated by a charge transfer transition arising from the dicyanodibenzodioxin core of the compounds. Coordination of these compounds to rhenium(I) gave four novel neutral complexes that exhibited dual red and green emission. It was also noted that exchange of the axial halide ligand in the neutral species with acetonitrile gave a cationic species that showed green emission only.

Item Type: Thesis (PhD)
Date Type: Completion
Status: Unpublished
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Funders: KESS 2
Date of First Compliant Deposit: 5 December 2019
Last Modified: 17 Oct 2020 01:26
URI: http://orca.cf.ac.uk/id/eprint/127045

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