文献类型：期刊文献

英文题名：Exactly Opposite Luminescence Behaviors of Aggregated Diketopyrrolopyrrole Derivatives Depending on Different Molecular Conformations

作者：Sun, Xinyu[1,2];Yang, Qingying[1,2];Zhou, Wenqi[1,2];Du, Lei[1,2];Yin, Xinpeng[1,2];Zhao, Min[1,2];Wang, Limin[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Inst Fine Chem, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：126

期号：19

起止页码：8499

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;EI(收录号：20222212171929);WOS:【SCI-EXPANDED(收录号:WOS:000804933700030)】；

基金：This research was financially supported by the National Natural Science Foundation of China (21772039 and 21272069), and we gratefully acknowledge financial support from the Central Universities and Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences. Support from the Chinese Scholarship Council is also acknowledged.

语种：英文

外文关键词：Chain length - Conformations - Molecules - Quantum theory

摘要：A new diketopyrrolopyrrole (DPP) derivative,DPPA-4-Caz, with a distorted molecular conformation has beensynthesized, exhibiting aggregation-induced emission (AIE) andmechanofluorochromic (MFC) properties, with a solid-statefluorescence quantum yield of 0.286 and a 37 nm redshift inemission upon grinding. This compound can exhibit either AIE oraggregation-caused quenching effect, and these totally contra-dictory phenomena are attributed to its two polymorphic formscorrespondingly. When the molecule bending is S-type, a looseintermolecular packing pattern is formed in the aggregation state,where the aromatic rings'rotation is constrained, leading toluminescence. When bending is Z-type, the molecules are parallel-stacked and quench upon aggregation. Five other compounds withsimilar structures were also synthesized in order to investigate the effects of substituents and alkyl chain length on the properties ofAIE and MFC. The results show that the electronic effect of the substituent plays a major role in the production of AIE, while thealkyl chain length has a greater effect on MFC properties.