文献类型：期刊文献

英文题名：Escalating Control over Excited-State Structural Evolution of N,N ′-Diphenyl-dihydrodibenzo[a,c]phenazine through the "Rigid-Flexible Coupled" Macrocyclization

作者：Wu, Yifan[1,2];Li, Lu[1,2];Cong, Muyu[1,2];Wang, Qiaochun[1,2];Su, Jianhua[1,2];Guo, Lifang[1,2];Zhang, Zhiyun[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Materiobiol & Dynam Chem, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Feringa Nobel Prize Scientist Joint Res Ctr, Joint Int Res Lab Precis Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：36

期号：10

起止页码：5092

外文期刊名：CHEMISTRY OF MATERIALS

收录：;EI(收录号：20242116112875);WOS:【SCI-EXPANDED(收录号:WOS:001225126800001)】；

基金：We are thankful for financial support from the NSFC/China (22335004, 22175063, 22004036).

语种：英文

外文关键词：Musculoskeletal system

摘要：Herein, we demonstrate the progressive excited-state structural evolution of a flexible polycyclic pi-skeleton by introducing a "rigid-flexible coupling" macrocyclization strategy to impose an ever-escalating constraint. Here, a series of compounds DPAC-RFn (n = 3, 5, 8, 9, 10, 11, 12, 15, 17) were prepared by cyclizing the molecule N,N '-diphenyl-dihydrodibenzo[a,c]-phenazine (DPAC) with a "rigid-flexible coupled" chain composed of a rigid phenyl ring and flexible alkyl chains of varying lengths. Although the absorption remains unchanged (around 350 nm), their emissions exhibit significant chain-length dependence. Nanosecond time-resolved measurements and theoretical calculation confirm the excited-state structural evolution of DPAC-RFn from bend-planar-twist conformers, correlating with successive emission distributions in the blue-green region (n = 3, 5, 8, 9, 470-500 nm), yellow-green region (n = 10, 11, 520-530 nm), and orange-red region (n = 12, 15, 17, 590-620 nm). This study explicitly reveals the excited-state structural diversity of flexible polycyclic pi-skeleton derivatives and achieves a large-scale coverage in the emission colors, thereby implying the potential prospects for fundamental studies and practical applications.