Series of New Cationic Iridium(III) Complexes with Tunable Emission Wavelength and Excited State Properties: Structures, Theoretical Calculations, and Photophysical and Electrochemical Properties

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• 作者：Qiang Zhao ; Shujuan Liu ; Mei Shi ; Chuanming Wang ; Mengxiao Yu ; Lei Li ; Fuyou Li ; Tao Yi ; Chunhui Huang
• 刊名：Inorganic Chemistry
• 出版年：2006
• 出版时间：August 7, 2006
• 年：2006
• 卷：45
• 期：16
• 页码：6152 - 6160
• 全文大小：794K
• 年卷期：v.45,no.16(August 7, 2006)
• ISSN：1520-510X

文摘

A series of new cationic iridium(III) complexes [Ir(piq)₂(NN)]⁺PF₆^- (1-6) (piq =1-phenyl-isoquinoline) containingNN ligands with different conjugated lengths were synthesized, where the six NN ligands were bipyridine,phenanthroline, 2-pyridyl-quinoline, 2,2'-biquinoline, 1,1'-biisoquinoline, and 2-(2-quniolinyl)quinoxaline. Single-crystalX-ray diffraction spectra of three complexes were studied, and the iridium(III) centers were found to adopt a distortedoctahedral coordination geometry with cis metalated carbons and trans nitrogen atoms. UV-vis, photoluminescence,cyclic voltammetry, and theoretical calculations were employed for studying the photophysical and electrochemicalproperties. And the excited-state properties were investigated in detail. The excited state of complexes is complicatedand contains triplet metal-to-ligand charge transfer (³MLCT), triplet ligand-to-ligand charge transfer (³LLCT), andligand-centered (cyclometalated) (³LC) transitions simultaneously. Importantly, the emission wavelength can betuned significantly from 586 to 732 nm by changing the conjugated length of NN ligands.