Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Novel Cationic 2-Phenylpyridine-based Iridium(III) Complexes Bearing an Ancillary Phosphine Ligand: Synthesis, Photophysics and Crystal Structure

  • Ma, Ai-Feng (Department of Chemistry, Pusan National University) ;
  • Seo, Hoe-Joo (Department of Chemistry, Pusan National University) ;
  • Jin, Sung-Ho (Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University) ;
  • Yoon, Ung-Chan (Department of Chemistry, Pusan National University) ;
  • Hyun, Myeong-Ho (Department of Chemistry, Pusan National University) ;
  • Kang, Sung-Kwon (Department of Chemistry, Chungnam National University) ;
  • Kim, Young-Inn (Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University)
  • Published : 2009.11.20
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Abstract

Three novel phosphorescent 2-phenylpyridine-based iridium(III) complexes, $[(ppy)_2Ir(P\^{}N)]PF6\;(1),\;[(dfppy)_2Ir(P\^{}N)]PF_6$ (2), and $[(dfmppy)_2 Ir(P\^{}N)]PF6$ (3), where $P\^{}N$ = 2-[(diphenylphosphino)methyl]pyridine (dppmp), were synthesized and characterized. The absorption, photoluminescence, cyclic voltammetry and thermal stability of the complexes were investigated. The complexes showed bright blue luminescences at wavelengths of 448 $\sim$ 500 nm at room temperature in $CHCl_3$ and revealed that the $\pi$-acceptor ability of the phosphorous atom in the ancillary dppmp ligand plays an important role in tuning emission color resulting in a blue-shift emission. The single crystal structure of $[(dfmppy))_2Ir(P\^N)]PF_6$ was determined using X-ray crystallography. The iridium metal center adopts a distorted octahedral structure coordinated to two dfmppy and one dppmp ligand, showing cis C-C and trans N-N chelate dispositions. There is a $\pi-\pi$ overlap between π electrons delocalized in the difluorophenyl rings.

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References

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