Photocontrolled Reversibly Chiral-Ordered Assembly Based on Cucurbituril
Guoxing Liu, Changming Tian, Xinhui Fan, Xiaoping Xue, Feng Li, Conghui Wang, Yu Liu
Abstract
High Resolution Image Download MS PowerPoint Slide Chirality transfer and regulation, accompanied by morphology transformation, arouse widespread interest for application in materials and biological science. Here, a photocontrolled supramolecular chiral switch is fabricated from chiral diphenylalanine ( l -Phe- l -Phe, FF) modified with naphthalene ( 2 ), achiral dithienylethene (DTE) photoswitch ( 1 ), and cucurbit[8]uril (CB[8]). Chirality transfer from the chiral FF moiety of 2 to a charge-transfer (CT) heterodimer consisting of achiral guest 1 and achiral naphthalene (NP) in 2 has been unprecedented achieved via the encapsulation of CB[8]. On the contrary, chirality transfer from chiral FF to NP cannot be conducted in only guest 2 . Crucially, induced circular dichroism of the heterodimer can be further modulated by distinct light, attributing to reversible photoisomerization of the DTE. Meanwhile, topological nanostructures are changed from one-dimensional (1D) nanofibers to two-dimensional (2D) nanosheets in the orderly assembling process of the heterodimer, which further achieved reversible interconversion between 2D nanosheets and 1D nanorods with tunable-induced chirality stimulated by diverse light.