Citation: Rong Huang, Xiao Qiang Wei, Tai Ping Zhang, Zhi Yun Lu, Ming Gui Xie. Synthesis and phosphorescent properties of two novel iridium (Ⅲ) complexes bearing bulky tert-butyl substituents[J]. Chinese Chemical Letters, ;2007, 18(9): 1119-1123. doi: 10.1016/j.cclet.2007.06.008 shu

Synthesis and phosphorescent properties of two novel iridium (Ⅲ) complexes bearing bulky tert-butyl substituents

a College of Chemistry, Sichuan University, Chengdu 610064, China;
b School of Optic-electronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China

Received Date: 26 February 2007

Fund Project: This work is financially supported by the National Natural Science Foundation of China (No.20672076).

The synthesis and phosphorescence properties of two novel Ir (Ⅲ) complexes bearing tert-butyl substituents, bis (4-tert-butyl-2-phenylbenzothiozolato-N, C^2') iridium (Ⅲ) (acetylacetonate)[(tbt) ₂Ir (acac)] and bis (4-tert-butyl-1-phenyl-1H-benzimidazolatoN, C^2') iridium (Ⅲ) (acetylacetonate)[(tpbi) ₂Ir (acac)], are reported, their molecular structures are confirmed by ¹H NMR, ESI-MS and elementary analysis. Photoluminescence (PL) studies revealed that they can emit strong green and orange phosphorescence in high quantum yields. Compared to their prototypes lacking of tert-butyl substituents, the two novel iridium (Ⅲ) complexes both have shorter lifetimes and improved or nearly similar PL quantum efficiencies, implying that the exciton quenching is inhibited effectively when molecular steric hindrance increases. The two chelates have great potential to be used as electrophosphorescent materials.
- Synthesis,
- tert-Butyl substituent,
- Phosphorescence,
- Electrophosphorescence
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