Bi-substituted Effect on Phenylisoquinoline Iridium(III) Complexes

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• 作者：Yu-Ting Huang ; Ta-Hsien Chuang ; Yu-Lin Shu ; Yi-Chun Kuo ; Pei-Lin Wu ; Cheng-Hsien Yang ; and I-Wen Sun
• 刊名：Organometallics
• 出版年：2005
• 出版时间：December 5, 2005
• 年：2005
• 卷：24
• 期：25
• 页码：6230 - 6238
• 全文大小：184K
• 年卷期：v.24,no.25(December 5, 2005)
• ISSN：1520-6041

文摘

This paper studies the synthesis and photophysical properties of a series of bi-substitutedphenylisoquinoline iridium(III) complexes. Interestingly, the bis[3-methyl-1-p-tolylisoquinolinato-N,C²'] iridium(III) (acetylacetonate) (6a1) could be prepared even though the single-crystal X-ray crystallography data showed that there was steric hindrance due to the methylgroup on the C-3 position to isoquinoline. Noticeably, the cyclic voltammetric (CV)measurements indicated that although these iridium(III) complexes have similar energygaps, their E_1/2(ox) are different from the mono-substituted (in phenyl ring) phenylisoquinolineiridium(III) complexes. This illustrates that the major influence of oxidation potential foriridium(III) complexes is the substituted isoquinoline ring. While all these complexes emittedin the red region, the bis[5-methyl-1-p-tolylisoquinolinato-N,C²'] iridium(III) (acetylacetonate)(6c1) showed a higher brightness of 9299.36 cd/m² at a higher current density of J = 63.69mA/cm² and a better luminance efficiency of 21.96 cd/A at a current density of J = 0.28mA/cm². The corresponding CIE (Commission International de L'Eclairage) coordinates arex = 0.67, y = 0.33.