通过分子间相互作用和机械响应调节苯并噻二唑基分子的发光行为

Adjusting Emission Behaviors of Molecules Based Benzothiadiazole by Intermolecular Interaction and Mechano-responsive

通过分子构型和分子间相互作用是调节材料的发光颜色和光物理性能的重要途径之一。本文以苯并噻二唑为受体(A)、三苯胺(TPA)和二甲基吖啶(DMAC)为给体(D),设计并合成了两种D‐A‐D和D‐A‐D′型的发光分子,分别为TBT和DBT。两种分子均表现出同质多晶现象(TBT‐O:λ_(PL)=593 nm和TBT‐R:λ_(PL)=616 nm;DBT‐Y:λ_(PL)=570 nm,DBT‐O:λ_(PL)=605 nm和DBT‐R:λ_(PL)=642 nm)。在外界刺激下,对称结构的TBT为四色的可逆光色转换,非对称的DBT分子则表现为不可逆光色转换。本研究为基于苯并噻二唑类刺激响应发光材料提供了重要的分子设计思路。

It is a feasible way to adjust emission behaviors by molecular conformation and intermolecular interactions.Herein,two multifunctional materials,4,4′-(benzo[c][1,2,5]thiadiazole-4,7-diyl)bis(N,N-diphenylaniline)and 4-(7-(9,9-dimethylacridin-10(9H)-yl)benzo[c][1,2,5]thiadiazol-4-yl)-N,N-diphenylaniline,namely TBT and DBT,with donor-acceptor-donor(D-A-D)and D-A-D′structures composed of 2,1,3-benzothiadiazole(BT)acceptor and the different donors of triphenylamine(TPA)and 9,9-dimethyl-9,10-dihydroacridine(DMAC)were synthesized.These materials exhibit not only polymorphism-dependent emission but also multicolor luminescence switch in response to the external stimulus.The high-contrast crystal-dependent emission behaviors of TBT(TBT‐O:λ_(PL)=593 nm and TBT‐R:λ_(PL)=616 nm)and DBT(DBT‐Y:λ_(PL)=570 nm,DBT‐O:λ_(PL)=605 nm and DBTR:λ_(PL)=642 nm)were observed.TBT with double TPA groups exhibits four reversible color switches,while DBT with TPA and DMAC groups shows irreversible bicolor change.