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Isomers of Pyrene–Imidazole Compounds: Synthesis and Configuration Effect on Optical Properties

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posted on 18.12.2015 by Yulong Liu, Tong Shan, Liang Yao, Qing Bai, Yachen Guo, Jinyu Li, Xiao Han, Weijun Li, Zhiming Wang, Bing Yang, Ping Lu, Yuguang Ma
Two pyrene-imidazole-based structural isomers, axisymmetric syn-PyDTI and centrosymmetric anti-PyDTI, have been easily produced and successfully separated in a one-pot reaction. Crystalline syn-PyDTI exhibited a 2-fold higher quantum efficiency than anti-PyDTI and displayed a much better performance in OLEDs with a ηc.max of 11.4 cd A–1 (8.8 cd A–1 for anti-PyDTI), although they possess the same apparent electronic structure. Observations revealed that the molecular excited-state properties are derived from distinct structural symmetries.