writer：Guangqiang Yin, J. Huang, D. Liu, R. Li, S. Wei, M. Si, F. Ni,Y. Zheng?, Q.Yang, R. Zhou?, Tao Chen*
keywords：Fluorescence Supramolecular hydrogel Ultrasound-responsive Mechanochemical transformation Terpyridine-europium coordination Dynamic interaction
source：期刊
specific source：Chinese Chemical Letters, 2022, https://doi.org/10.1016/j.cclet.2022.03.013
Issue time：2023年

As a burgeoning research field, ultrasound-responsive materials have attracted intense interest in healthcare research. However, the basic mechanism of sonochemical effect in the quasi-solid state is far from being well understood than those in the solution. Herein, we showcase mechanochemical transformations of europium(III) complexes in a supramolecular hydrogel matrix. With the combination of labile terpyridine-europium complexes (TPY-Eu3+) as mechanochromic moieties and an ultrasound-responsive fluorogen (URF) as a molecular tweezer, the hydrogel produces a notable fluorescence change in response to ultrasound. The mechanochemical transformation was elucidated by molecular dynamics (MD) simulations, and fully probed and evidenced by electrochemical experiments, X-ray photoelectron spectroscopy (XPS), and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy.