Strategies to Optimize Photophysical Properties in Cyclometalated Iridium Complexes

In the past 50 years, iridium has become an indispensable material that supports various technologies that power our modern world. Recently, there has been a growing interest in iridium(III) organometallic complexes for their optoelectronic applications. This thesis delves into the synthesis, structural characterization, and photophysical properties of several new iridium-based complexes. The research is divided into six sections, each contributing to our understanding of the versatile applications and unique characteristics of these compounds. Chapter 1 provides an overview of iridium(III) coordination chemistry, including its potential uses and challenges. Chapter 2 focuses on formazans, nitrogen-rich conjugated compounds, and their use as metalloligands in the assembly of polynuclear complexes. Chapter 3 investigates a series of neutral Chugaev-type chelating dicarbene iridium complexes with diverse cyclometalating ligands. In Chapter 4, the reactivity of bis-cyclometalated iridium bis-isocyanide complexes with azides is explored, which results in luminescent structures that depend on the aryl isocyanide substituents. Chapter 5 introduces a series of red and deep-red emitting heteroleptic bis-cyclometalated iridium(III) complexes with salicylaldimine and 2-picolinamide ancillary ligands. These complexes offer control over energy levels and emission color profiles. Lastly, Chapter 6 investigates the influence of coordination modes on emission properties. Overall, this thesis presents valuable insights into the design of iridium complexes, their potential significance in optoelectronic technologies, and their unique photophysical properties. It makes a significant contribution to the field of coordination chemistry and materials science.

Name thesis:degree_name

Doctor of Philosophy

Level thesis:degree_level

Doctoral

Discipline thesis:degree_discipline

Chemistry

Grantor

University of Houston

Year dc:date.issued

2023

Author dc:creator

• Jiang, Chenggang

Advisor dc:contributor.advisor

• Teets, Thomas S.

Committee members dc:contributor.committeemember

• Brgoch, Jakoah
• Zastrow, Melissa L.
• Wu, Judy I-Chia
• Bao, Jiming

• Cyclometalated iridium
• Phosphorescence
• Photoluminescence
• Quantum yield
• Carbene ligands

Statement dc:rights

• The author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/10657/16187

OAI identifier oai:identifier

oai:uh-ir.tdl.org:10657/16187