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