Synthesis and Luminescence Studies of Hydrocarbon-Branched Tris-Cyclometallated Iridium (III) Complexes
- Authors
- Lee, Hyun-Shin; Ha, Yunkyoung
- Issue Date
- 2010
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- Hydrocarbon-branched; iridium complex; OLED; phosphorescence
- Citation
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.520, pp.336 - 343
- Journal Title
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS
- Volume
- 520
- Start Page
- 336
- End Page
- 343
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/21695
- DOI
- 10.1080/15421401003609228
- ISSN
- 1542-1406
- Abstract
- We synthesized the tris-cyclometallated iridium complexes containing the substituted styryl groups and their saturated analogs. As the styryl iridium complexes, Ir(F-ppy-4-CH=CHC6H4R)(3) (where R = Me, NMe2, OMe) were prepared via direct functionalization of the methyl groups in the ppy (2-phenylpyridine) ligand at the iridium complexes. The corresponding saturated analogs, Ir(F-ppy-4-CH2CH2C6H4R)(3) (where R = Me, NMe2), were synthesized during the two step reactions of the IrCl3 center dot xH(2)O with F-ppy-4-CH=CHC6H4R via in situ hydrogenation. Their photophysical properties were investigated both in solution and in film. The longer pi-conjugation in the cyclometallating ligands leads to the bathochromic shift in photoluminescence of their iridium complexes. Among R groups, the NMe2 end group had the strongest push-pull effect with the F group at the other end, and led to the effective control of the ILCT transition.
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