Transition metal complexes have seen increased application in the fields of photoredox catalysis, photodynamic therapy, biological sensing, and as phosphors for organic light-emitting diodes. Additionally, non-linear optical applications of these materials have increased due to recent reports of two photon absorption and reverse saturable absorption (RSA) characteristics. Recent studies have demonstrated iridium is of particular interest as the transition metal center for organometallic chromophores because of its strong spin-orbit coupling, which allows for multiple excited states, thereby increasing the compound’s ability to absorb light over a broad spectrum. Our work focused on the synthesis of a series of functionalized phenylbenzothiazole (pbt) ligands to explore the effects on the photophysical properties of the synthesized Ir(III) cyclometalated chromophores and evaluate their potential application as RSA materials. The Ir(III) cyclometalated complexes were prepared from the bromo substituted pbt. The intermediate was then subjected to microwave assisted Suzuki reaction conditions to form the derivatized pbt cyclometalated complex.
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