title: A supramolecular cross-linked conjugated polymer network for multiple fluorescent sensing.
abstract: A supramolecular cross-linked network was fabricated and demonstrated to act as a multiple fluorescent sensor. It was constructed from a fluorescent conjugated polymer and a bisammonium salt cross-linker driven by dibenzo[24]crown-8/secondary ammonium salt host-guest interactions. Compared with the conjugated polymer, the network has weak fluorescence due to the aggregation of polymer chains. Thanks to the multiple stimuli-responsiveness of host-guest interactions, the fluorescence intensity of the system can be enhanced by four types of signals, including potassium cation, chloride anion, pH increase, and heating. Hence, the network can serve as a cation sensor, an anion sensor, a pH sensor, and a temperature sensor. It can be used in both solution and thin film. Interestingly, exposure of a film made from this supramolecular cross-linked network to ammonia leads to an increase of fluorescence, making it a good candidate for gas detection.
authors.affiliation: MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310027, PR China.
authors.forename: Xiaofan
authors.initials: X
authors.lastname: Ji
authors.forename: Yong
authors.initials: Y
authors.lastname: Yao
authors.forename: Jinying
authors.initials: J
authors.lastname: Li
authors.forename: Xuzhou
authors.initials: X
authors.lastname: Yan
authors.forename: Feihe
authors.initials: F
authors.lastname: Huang
mesh_terms: D003432:Cross-Linking Reagents / Q000138:chemical synthesis / Q000737:chemistry*; D043844:Crown Ethers / Q000737:chemistry; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D046911:Macromolecular Substances / Q000138:chemical synthesis / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013696:Temperature
chemical_list: D003432:Cross-Linking Reagents; D043844:Crown Ethers; D005456:Fluorescent Dyes; D046911:Macromolecular Substances; D011108:Polymers; D000644:Quaternary Ammonium Compounds; C071087:dibenzo-24-crown-8