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Electrochemical and Phosphorescent Properties of New Ir(III) Complexes Coordinated by Various Bipyridine Derivatives

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Abstract

Four useful polypyridine iridium(III) complexes in the form of [IrCl2L2]+ were prepared and their spectroscopic and electrochemical properties as well as X-ray crystallography were investigated. The ligands used were L = 2,2’-bipyridine, 4,4’-dimethyl-2,2’-bipyridine, 4,4’-diphenyl-2,2’-bipyridine, 1,10-phenanthroline, 4,7-diphenyl-1,10-phenanthroline, and 2,2’-biquinoline. Synthetic methods were developed by a sequential ligand-replacement, which occurred in the reaction vessel using a microwave oven. All complexes showed that LUMOs are based on the π-system contribution of the polypyridine ligand for [IrCl2(bpy)2]+, [IrCl2(dmbpy)2]+, [IrCl2(dpbpy)2]+, [IrCl2(phen)2]+, [IrCl2(dpphen)2]+ and [IrCl2(bqn)2]+. The HOMOs are also localized on the polypyridine ligand in the iridium complexes. It was found that [IrCl2L2]+ emits intense phosphorescence at room temperature. In particular, the use of dpbpy as ancillary ligands extends the lifetime (660 ns) of the 3(π-π*) excited states of Ir(III) polypyridine complexes. The complex [IrCl2(bqn)2]+ with electron acceptor substituents shows a large red-shift to 622 nm. It is noticed that iridium polypyridine complexes show intense emissions at various colors, such as yellow for [IrCl2(dmbpy)2]+ and red for [IrCl2(bqn)2]+, which can be applied to photosensitizers. The spectroscopic and electrochemical details are also reported herein.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Nara Women’s University, Nara, 630-8506, Japan

    Naokazu Yoshikawa, Hiroshi Takashima & Keiichi Tsukahara

  2. Department of Chemistry, Nara University of Education, Takabatake-cho, Nara, 630-8528, Japan

    Jun Sakamoto & Takeko Matsumura-Inoue

  3. Department of Applied Chemistry, Graduate School of Engineering Osaka University, Yamada-Oka 2-1, Suita, Osaka, 565-0871, Japan

    Nobuko Kanehisa & Yasushi Kai

Authors
  1. Naokazu Yoshikawa
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  2. Jun Sakamoto
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  3. Takeko Matsumura-Inoue
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  4. Hiroshi Takashima
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  5. Keiichi Tsukahara
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  6. Nobuko Kanehisa
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  7. Yasushi Kai
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Correspondence to Naokazu Yoshikawa.

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Yoshikawa, N., Sakamoto, J., Matsumura-Inoue, T. et al. Electrochemical and Phosphorescent Properties of New Ir(III) Complexes Coordinated by Various Bipyridine Derivatives. ANAL. SCI. 20, 711–716 (2004). https://doi.org/10.2116/analsci.20.711

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  • DOI: https://doi.org/10.2116/analsci.20.711

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