Citation: WU Chen, XUE Li-Sha, Li Tian-Yi, ZHANG Song, ZHENG You-Xuan. Color Tuning of Iridium Complexes by Using Conjugative Effect of Pyridine-derived Cyclometalated Ligands[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(5): 969-976. doi: 10.11862/CJIC.2014.146 shu

Color Tuning of Iridium Complexes by Using Conjugative Effect of Pyridine-derived Cyclometalated Ligands

1.
State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China

Received Date: 12 December 2013
Available Online: 6 January 2014
Fund Project: 南京大学创新训练(No.G1210284036) (No.G1210284036)国家自然科学基金(No.20971067)资助项目。 (No.20971067)

Using pyridine-derived cyclometalated ligands and tetraphenylimidodiphosphinate (Htpip) ancillary ligand, three iridium complexes of Ir(ppy)₂tpip (Hppy=2-phenylpyridine), Ir(npy)₂tpip (Hnpy=2-(naphthalene-1-yl)pyridine) and Ir(pnpy)₂tpip (Hpnpy=2-(phenathren-9-yl)pyridine) were synthesized. Their structures were deter-mined by ¹H NMR, MS(MALDI-TOF), and the complex Ir(ppy)₂tpip was also characterized by crystal structure analysis. Extended π conjugation in cyclometalated ligands leads to narrower bandgap resulting in the red shift emission from 516 nm to 600, 633 nm (from green to red). Consequently, when the cyclometalated ligands change from ppy to npy and pnpy, the quantum efficiencies of the complexes are also improved to 0.36, 0.51 and 0.53, respectively. The conjugative effect of the aromatic rings affects the electron density of heterocycle pyridine and thus increases the energy of LUM Oas evidenced by the spectroscopic data and the computational calculation results. The regular patterns between the ligand structure and the emission can be applied for designing novel iridium complexes with various colors.
- coordination chemistry;iridium complex;cyclometalated ligand;conjugative effect;phosphorescence;bathochromic-shift
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沈阳化工大学材料科学与工程学院沈阳 110142