Evidence for Strong Mixing Between the LC and MLCT Excited States in Some Heteroleptic Iridium (III) Complexes |
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Authors: | Jayaraman Jayabharathi Venugopal Thanikachalam Natesan Srinivasan Marimuthu Venkatesh Perumal |
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Affiliation: | (1) Department of Chemistry, Annamalai University, Annamalainagar, 608002, Tamilnadu, India |
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Abstract: | The synthesis, structure and photophysical properties of series of new luminescent cyclometalated Iridium (III) complexes are reported. The cyclometalated ligand used here is 2-aryl imidazole and the auxiliary ligand is acetyl acetone (acac). The crystal structure of the complex (dmdpi)2Ir(acac) (5) show that the Iridium(III) ion resides in a distorted octahedral environment. All complexes exhibit bright photoluminescence (PL) at room temperature and (fpdmdmpi)2Ir(acac) 4 has a high solution PL quantum efficiency of 0.56. The role played by electron releasing and electron withdrawing substituents of the 2-arylimidazole ligands towards the stability of HOMO and how the substituent influences the luminescent behaviour are discussed. Furthermore those substituents have effect on the contribution to mixing between 3(π-π*) and 3(MLCT) for the lowest excited states. |
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