Efficient triplet pair separation from intramolecular singlet fission in dibenzopentalene derivatives

查看全文 作　　者：Yanping [1,2]Liu;Yishi [1]Wu;Long [1,2]Wang;Lanfen [1]Wang;Jiannian [1,3]Yao;Hongbing [1,3,4]Fu 机构地区：[1]Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;[2]Department of Chemistry,University of Chinese Academy of Sciences,Beijing 100049,China;[3]Department of Chemistry,Capital Normal University,Beijing 100048,China;[4]Department of Chemistry,Tianjin University,Tianjin 300072,China 出　　处：《Science China Chemistry》索引2019年第62卷第8期,共7页 基　　金：supported by the National Natural Science Foundation of China (21573251, 21833005);the National Basic Research Program of China (2017YFA0204503);the Beijing Natural Science Foundation of China (2162011);Project of State Key Laboratory on Integrated Optoelectronics of Jilin University (IOSKL2014KF16) 摘　　要：In intramolecular SF(iSF), the strong coupling nature and confinement of diffusional separation of ^1(TT) limits the extraction and harnessing of triplet energy. In order to investigate the possible ^1(TT) separation and the role of molecular parameters on it, a series of iSF-capable dibenzopentalene derivatives(DBPs) have been synthesized and their photoinduced dynamics are monitored. iSF takes place in DBPs, accompanied by consecutive ^1(TT) separation in polycrystalline film with almost ^100% yield. It is suggested the strong intermolecular coupling provided by the closely packing configuration in the film facilitates the disentanglement of correlated ^1(TT). Highly efficient triplet pair separation to yield free triplets makes one step forward for utilizing triplet energy from iSF materials for further optoelectronic applications. 关 键 词：INTRAMOLECULAR SINGLET FISSION TRIPLET PAIR separation INTERMOLECULAR coupling transient absorption spectroscopy