Efficient triplet pair separation from intramolecular singlet fission in dibenzopentalene derivatives  

作　　者：Yanping Liu Yishi Wu Long Wang Lanfen Wang Jiannian Yao Hongbing 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》2019年第8期1037-1043,共7页中国科学（化学英文版）

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.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 

分 类 号：O6[理学—化学]