Cationic Iridium Complexes with Intramolecular 蟺鈥撓€ Interaction and Enhanced Steric Hindrance for Solid-State Light-Emitting Electrochemical Cells

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• 作者：Hsiao-Fan Chen ; Wen-Yi Hung ; Shou-Wei Chen ; Ting-Chih Wang ; Shih-Wei Lin ; Shu-Hua Chou ; Chih-Teng Liao ; Hai-Ching Su ; Hsiao-An Pan ; Pi-Tai Chou ; Yi-Hung Liu ; Ken-Tsung Wong
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：November 19, 2012
• 年：2012
• 卷：51
• 期：22
• 页码：12114-12121
• 全文大小：457K
• 年卷期：v.51,no.22(November 19, 2012)
• ISSN：1520-510X

文摘

Cationic iridium complexes incorporated 4,5-diaza-9,9鈥?spirobifluorene as NN ancillary ligands, in which one (2) or two (3) phenyl groups were introduced onto 4,5-diazafluorene to afford intraligand 蟺鈥撓€ interactions. The X-ray crystal structures of complexes 2 and 3 show that the pendant phenyl ring forms strong intramolecular face-to-face 蟺-stacking with the difluorophenyl ring of the cyclometalated ligand with distances of 3.38 脜 for complex 2 and 3.40 and 3.46 脜 for complex 3. This 蟺鈥撓€ stacking interaction minimizes the expansion of the metal鈥搇igand bonds in the excited state, resulting in a longer device lifetime in the light-emitting electrochemical cell (LEC) devices.