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http://dx.doi.org/10.5012/bkcs.2012.33.1.183

Synthesis and Crystal Structure of Blue Phosphorescent mer-Tris(2',6'-difluoro-2,3'-bipyridinato-N,C4') Iridium(III)  

Jung, Na-Rae (Division of Science Education & Department of Chemistry, Kangwon National University)
Lee, Eun-Ji (Division of Science Education & Department of Chemistry, Kangwon National University)
Kim, Jin-Ho (Division of Science Education & Department of Chemistry, Kangwon National University)
Park, Hyoung-Keun (Division of Science Education & Department of Chemistry, Kangwon National University)
Park, Ki-Min (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University)
Kang, Young-Jin (Division of Science Education & Department of Chemistry, Kangwon National University)
Publication Information
Bulletin of the Korean Chemical Society / v.33, no.1, 2012 , pp. 183-188 More about this Journal
Abstract
A blue phosphorescent $Ir(dfpypy)_3$ (dfpypy:fluorinated pyridine-pyridine ligand) complex with meridional configuration has been synthesized by newly developed effective method and its solid state structure and photoluminescence are characterized. For this complex, mer-$Ir(dfpypy)_3$, the glass-transition and decomposition temperatures appear at $160^{\circ}C$ and $384^{\circ}C$ respectively in TGA and DSC experiments, which indicates that this complex has high thermal stability. In a crystalline structure, an average Ir-C bond length of mer-$Ir(dfpypy)_3$ is slightly longer than that of fac-$Ir(dfpypy)_3$, which assumed to be due to the weak trans-influence. The absorption and emission spectra are observed more red-shifted in mer-$Ir(dfpypy)_3$ than fac-$Ir(dfpypy)_3$. In addition, the former is readily oxidized than the latter in electrochemical behavior.
Keywords
Blue phosphorescence; Facial/meridional isomer; Thermal property; Crystal structure; Photophysical property;
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