Zhuoran Kuang, Xian Wang, Zhen Wang, Guiying He, Qianjin Guo, Lei He, Andong Xia. Phosphorescent Cationic Iridium (III) Complexes with 1,3,4-Oxadiazole Cyclometalating Ligands:Solvent-Dependent Excited-State Dynamics[J]. Chinese Journal of Chemical Physics , 2017, 30(3): 259-267. doi: 10.1063/1674-0068/30/cjcp1703058
Citation: Zhuoran Kuang, Xian Wang, Zhen Wang, Guiying He, Qianjin Guo, Lei He, Andong Xia. Phosphorescent Cationic Iridium (III) Complexes with 1,3,4-Oxadiazole Cyclometalating Ligands:Solvent-Dependent Excited-State Dynamics[J]. Chinese Journal of Chemical Physics , 2017, 30(3): 259-267. doi: 10.1063/1674-0068/30/cjcp1703058

Phosphorescent Cationic Iridium (III) Complexes with 1,3,4-Oxadiazole Cyclometalating Ligands:Solvent-Dependent Excited-State Dynamics

doi: 10.1063/1674-0068/30/cjcp1703058
  • Received Date: 2017-03-29
  • Rev Recd Date: 2017-05-16
  • To elucidate the nature of low-lying triplet states and the effect of ligand modifications on the excited-state properties of functional cationic iridium complexes,the solventdependent excited-state dynamics of two phosphorescent cationic iridium (III) complexes,namely[Ir (dph-oxd)2(bpy)]PF6( 1 ) and[Ir (dph-oxd)2(pzpy)]PF6( 2 ),were investigated by femtosecond and nanosecond transient absorption spectroscopy.Upon photoexcitation to the metal-to-ligand charge-transfer (MLCT) states,the excited-state dynamics shows a rapid process (τ=0.7-3 ps) for the formation of solvent stabilized 3MLCT states,which significantly depends on the solvent polarity for both 1 and 2 .Sequentially,a relatively slow process assigned to the vibrational cooling/geometrical relaxation and a long-lived phosphorescent emissive state is identified.Due to the different excited-state electronic structures regulated by ancillary ligands,the solvation-induced stabilization of the 3MLCT state in 1 is faster than that in 2 .The present results provide a better sight of excited-state relaxation dynamics of ligand-related iridium (III) complexes and solvation effects on triplet manifolds.

     

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