title: Double metal ions competitively control the guest-sensing process: a facile approach to stimuli-responsive supramolecular gels.
abstract: A facile approach to the design of stimuli-responsive supramolecular gels (SRSGs) termed double-metal-ion competitive coordination control is reported. By this means, the fluorescence signals and guest-selective responsiveness of the SRSGs are controlled by the competitive coordination of two different metal ions with the gelators and the target guest. To demonstrate this approach, a gelator G2 based on multiple self-assembly driving forces was synthesized. G2 could form Ca(2+) -coordinated metallogel CaG with strong aggregation-induced emission (AIE). Doping of CaG with Cu(2+) results in AIE quenching of CaG and formation of Ca(2+) - and Cu(2+) -based metallogel CaCuG. CaCuG could fluorescently detect CN(-) with specific selectivity through the competitive coordination of CN(-) with the Cu(2+) and the coordination of Ca(2+) with G2 again. This approach may open up routes to novel stimuli-responsive supramolecular materials.
authors: Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, 730070 (P. R. China). linqi2004@126.com.
authors: Qi
authors: Q
authors: Lin
authors: Bin
authors: B
authors: Sun
authors: Qing-Ping
authors: QP
authors: Yang
authors: Yong-Peng
authors: YP
authors: Fu
authors: Xin
authors: X
authors: Zhu
authors: Tai-Bao
authors: TB
authors: Wei
authors: You-Ming
authors: YM
authors: Zhang
mesh_terms: D002118:Calcium / Q000737:chemistry*; D002413:Cations, Divalent / Q000737:chemistry; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D005453:Fluorescence; D005782:Gels / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D002413:Cations, Divalent; D056831:Coordination Complexes; D005782:Gels; D003300:Copper; D002118:Calcium
keywords: aggregation; fluorescence; gels; self-assembly; smart materials