Due to their tunable photoreactivity, light absorbing properties, and light emitting properties, organometallic iridium(III) complexes have found application in a wide variety of fields such as phosphorescent dopants in organic light emitting diodes (OLEDs), chemical sensing, light harvesting for solar cells, photocatalysis, and photodynamic therapy. Our team is particularly interested in their non-linear optical (NLO) properties such as reverse saturable absorption (RSA) and two-photon absorption (2PA). A series of iridium(III) complexes of the structure [IrIII(C^N)2(acac)]0 (where acac = acetylacetonate and C^N = 2,4-diphenylquinoline and its derivatives) were synthesized to investigate electronic effects on the photophysical properties of these complexes where different electron donating and electron withdrawing groups are positioned para- or meta- to the cyclometalating carbon. The photophysical properties were investigated via UV-vis absorption spectroscopy, emission spectroscopy, emission lifetime spectrometry, and transient absorption spectroscopy. The syntheses, chemical characterization, and photophysical properties of these iridium(III) complexes will be discussed in detail herein.

Tuning the photophysical behavior of Iridium(III) bis-2,4-diphenylquinoline acetylacetonate complexes through cyclometallating ligand substitution

ACS Fall 2021

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