This talk describes complementary synthetic strategies to enhance the photoluminescence and photoredox properties of organometallic complexes. We have addressed the long-standing challenge of designing efficient and stable blue-phosphorescent molecules, currently the most significant technological hurdle in OLED technology. Our efforts have resulted in new designs for blue-emitting iridium complexes, using strongly σ-donating acyclic diaminocarbene supporting ligands installed by unconventional routes relying on the electrophilic reactivity of coordinated isocyanides. Using a different design, we have employed nitrogen-containing, π-donating ancillary ligands in the development of new bis-cyclometalated iridium complexes which are efficient red and near-infrared phosphors or potent photoreductants for applications in photoredox catalysis. And finally, a more recent effort in our group has produced a modular synthetic strategy to prepare multi-chromophore arrays featuring cyclometalated iridium, providing easy access to new classes of luminescent supramolecular constructs. In addition to providing rich platforms for studying fundamental aspects of excited-state dynamics, some of these compounds function as ratiometric oxygen sensors in hypoxic environments.
Speaker: Thomas Teets, Univ. of Houston
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