Yamauchi Mitsuaki, Yamamoto Seiya, Masuo Sadahiro
Department of Applied Chemistry for Environment, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan.
Angew Chem Int Ed Engl. 2021 Mar 15;60(12):6473-6479. doi: 10.1002/anie.202015535. Epub 2021 Feb 10.
Multicomponent supramolecular assembly systems enable the generation of materials with outstanding properties, not obtained from single-component systems, via a synergetic effect. Herein, we demonstrate a novel supramolecular coassembly system rendering highly ordered quantum dot (QD) arrangement structures formed via the self-assembly of azobenzene derivatives, where the photocontrollable photoluminescence (PL) properties of the QDs are realized based on photoisomerization. Upon mixing the assembled azobenzene derivatives and QDs in apolar media, a time-evolution coaggregation into hierarchical nanosheets with a highly ordered QD arrangement structure occurs. Upon photoirradiation, the nanosheets transform into ill-defined aggregates without arranged QDs together with enhancing the PL intensity. In days, the photoirradiated coaggregates undergo recovery of the PL properties corresponding to the arranged QDs through thermal isomerization.
多组分超分子组装体系能够通过协同效应生成具有优异性能的材料，而这些性能是单组分体系所无法获得的。在此，我们展示了一种新型的超分子共组装体系，该体系通过偶氮苯衍生物的自组装形成了高度有序的量子点（QD）排列结构，其中量子点的光控光致发光（PL）特性是基于光异构化实现的。在非极性介质中将组装好的偶氮苯衍生物和量子点混合后，会发生随时间演化的共聚集，形成具有高度有序量子点排列结构的分级纳米片。光照后，纳米片转变为没有排列好量子点的不明确聚集体，同时PL强度增强。数天内，经光照的共聚集体通过热异构化恢复与排列好的量子点相对应的PL特性。
