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

초록

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.

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