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제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Studies on the Photochemical Properties of the Iridium Compound Is Replaced with Various o-carborane Ligand

2015년 9월 3일 15시 49분 49초
IND.P-94 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 16일 (금요일) 13:00~14:30
저자 및
최태섭, 조양진, 강상욱, 한원식1,*
고려대학교 소재화학과, Korea
1서울여자대학교 화학과, Korea
In the last decade, phosphorescent iridium(III) complexes have been widely used in organic light-emitting diodes (OLED) owing to their stable chemical structure, high luminescent efficiency, and tunable excitation and emission wavelength over the whole visible range. However, few carborane-based phosphorescent iridium(III) complexes have been reported. It is anticipated that introduction of carborane cages into phosphorescent iridium(III) complexes may further improve the photophysical properties of these complexes and allow better understanding the roles of carborane groups. In this communication, we synthesized iridium(III) complexes containing o-carborane in the various cyclometalated C^N ligand . The tuning of phosphorescence color has usually been achieved by the variation of the substituent on the C^N ligand. The variation in the excited state energy has usually been made by changing the electronic structure of the C^N ligand, which affects the energy levels of highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO). In this regard, we have recently reported that the introduction of o-carborane (1,2-closo-C2B10H12) to the 4- or 5- position of the phenyl ring of a ppy ligand in (C^N)2Ir(acac), (C^N)2Ir(pic) and (C^N)3Ir complexes gives rise to red and blue shifts of the phosphorescence band, respectively, when compared to the emission wavelength of (tphpy)2Ir(acac), (tphpy)2Ir(pic) and Ir(tphpy)3.