Photoisomerization,assembling and fluorescence photoswitching behaviors of a water-soluble stiff-stilbene with cucurbit[7]uril  

作　　者：Liangru Yang Yixin Li Haifan Zhang Changming Tian Qiaohong Cao Yongmei Xiao Libo Yuan Guoxing Liu 

机构地区：[1]College of Chemistry and Chemical Engineering,Henan University of Technology,Zhengzhou 450001,China [2]College of Science,Henan Agricultural University,Zhengzhou 450002,China

出　　处：《Chinese Chemical Letters》2023年第8期184-188,共5页中国化学快报（英文版）

基　　金：We thank Top-Notch Talents Program of Henan Agricultural University(No.30501049);Project supported by the Science and Technology Department of Henan Province(No.212102310332);the Merit Funding for the Oversea Staff of Henan Province for financial support.

摘　　要：Photoresponsive supramolecular systems have merited extensive attention for their applications in materials science and life science.Here,we synthesized a water-soluble stiff-stilbene molecular photoswitch,exhibiting outstanding photoisomerization reaction between its(E)-and(Z)-configurations upon irradiation at distinct light.The photoswitch can assemble with cucurbit[7]uril(CB[7])to form a superior fluorescent supramolecular complex(compared to the only guest)with excellent water solubility,which manifested dramatic photoluminescence enhancement caused by restriction of intramolecular rotation and remained good photochromic characteristics.Furthermore,introduction of CB[7]influence photoreaction quantum yield(Φ)of the stiff-stilbene,leading to reduction ofΦ_(E→Z) and increase ofΦ_(Z→E) of the stiff-stilbene.Importantly,the photoadjustable supramolecular assembly can act as a fluorescence switch,and the phototunable guest further selectively modulate G-quadruplex structure of Tel22 upon light irradiation or with addition of CB[7].The study provides a new simple way for accurately regulating photochromic properties of molecular switches and developing smart materials with potential applications in controlled modulation of G-quadruplex,targeted biological imaging and so on.

关 键 词：Supramolecular assemble Photoreponse Stiff-stilbene uril Fluorescence photoswitch Host-guest complexation 

分 类 号：O644.1[理学—物理化学]