Professor Fang Yu's research group of Shaanxi Normal University has made important progress in the field of design and synthesis of fluorescent active metal coordination ring and gas sensing

In recent years, in the face of the great demand of high sensitive detection technology, the creation and research and development of gas phase sensors have attracted the attention of the international community, and the relevant research has made rapid progress After ion mobility spectroscopy, membrane-based fluorescence sensor is a new generation of micro trace gas detection technology, which is expected to replace sniffing dogs, anti drug dogs and disease diagnosis dogs However, the thin film based fluorescent sensor for gas phase detection must be based on high-performance fluorescent sensitive thin film materials In the past 20 years, the research group of Professor Fang Yu of Shaanxi Normal University has been devoted to the creation of fluorescence sensitive thin film materials, the device of sensing thin film and the array research of thin film devices The research group has developed a series of fluorescent sensitive film materials, successfully developed high-performance fluorescent sensors and detection equipment for explosives, drugs and other harmful substances, and independently built a shared platform for material performance evaluation and prototype equipment development Relevant products have played an important role in the 19th National Congress of the CPC, G20 summit, Boao Forum, opening ceremony of Hong Kong Zhuhai Macao Bridge, reception of foreign heads of state and security of major events or places such as the Central Military Commission, Uganda presidential palace, Shenzhen Metro, etc Around this kind of research, Professor Fang Yu has trained a group of excellent talents, including a young thousand talents program winner of the Central Organization Department, a national hundred excellent papers award winner, a national new program winner, and four excellent papers award winners of Shaanxi Province In the past two years, Fang Yu's research group, School of chemistry and chemical engineering, Shaanxi Normal University, creatively introduced nonplanar fluorescent units into the film structure, prepared a series of fluorescent sensing films rich in "molecular channels", and realized the gas-phase detection of a variety of toxic and harmful chemicals In the related work, a strategy for the preparation of high-performance sensitive thin film materials using the "capillary condensation effect" on the film surface and the "excited state microenvironment sensitivity of fluorescence units" was established (chem SCI., 2018, 9, 1892; nature commun., 2018, 9, 1695; ACS appl Mater Interfaces, 2018, 10, 35647; anal Chem., 2018, 90, 14088; chem Commun , 2019 , 55 , 941 ）。 Recently, on the basis of these works, Professor Fang Yu's research group, in cooperation with Professor Peter J stang of the University of Utah in the United States, has prepared a series of metal coordination macrocycles with fluorescence activity by means of its strategy of building supramolecular complexes by directional coordination The formation of the macrocycles endows the fluorescent units with a series of excellent properties: (1) ）Compared with the ligands, the metal coordination significantly impedes the π - π aggregation between ligands with large conjugated structure, and greatly increases the solubility of ligands; (2) the fluorescence behavior of the system can be controlled in a large range through the replacement of connecting arms; (3) compared with the ligands, the fluorescence quantum yield of the metal coordination ring supported on the silica gel plate is significantly improved; (4 ）Based on the fact that the fluorescence properties of the metal coordination macrocyclic films supported on silica gel plates are very sensitive to the presence of aromatic amines, a film based aromatic amines fluorescence gas phase sensor with high sensitivity, fast response speed, short recovery time and long and stable use has been developed This work was recently published in J am Chem SOC (DOI: 10.1021 / JACS 8b12749) The first author of this paper is Chang Xingmao, a doctoral candidate in the Key Laboratory of the Ministry of education of applied surface and colloidal chemistry, Professor Fang Yu and Professor Peter J stang are co correspondents, and Shaanxi Normal University is the first signatory This work has been supported by NSFC (21527802, 21673133218201002005), "111" talent introduction plan (b14041) and "excellent doctoral thesis project of Shaanxi Normal University" (x2014yb04), etc Photos of some authors (from left: Qi Yanyu, Chang Xingmao, Fang Yu, Wang Chaolong, Shang congdi) (source: School of chemistry and chemical engineering, Shaanxi Normal University)