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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 1
BKCSDE 33(1)
January 20, 2012 

Synthesis and Crystal Structure of Blue Phosphorescent mer-Tris(2',6'-difluoro-2,3'-bipyridinato-N,C4') Iridium(III)
Narae Jung, Eunji Lee, Jinho Kim, Hyoungkeun Park, Ki-Min Park,*, Youngjin Kang*
Blue phosphorescence, Facial/meridional isomer, Thermal property, Crystal structure, Photophysical property
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 oC and 384 oC 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.
183 - 188
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