Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (1): 20210617.doi: 10.7503/cjcu20210617

• Article • Previous Articles     Next Articles

A Microporous Cationic Ga(III)-MOF with Fluorescence Properties for Selective sensing Fe3+ Ion and Nitroaromatic Compounds

WU Ji1, ZHANG Hao1, LUO Yuhui1(), GENG Wuyue1, LAN Yaqian2()   

  1. 1.School of Environmental and Chemical Engineering,Jiangsu Ocean University,Lianyungang 222000,China
    2.School of Chemistry,South China Normal University,Guangzhou 510631,China
  • Received:2021-08-25 Online:2022-01-10 Published:2021-10-11
  • Contact: LUO Yuhui,LAN Yaqian E-mail:luoyh@jou.edu.cn;yqlan@m.scnu.edu.cn
  • Supported by:
    the Six Talents Peak Project of Jiangsu Province, China(XCL-009);the Open Project of the Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, China(AM201902)

Abstract:

A new cationic gallium-organic framework, namely [Ga3O(H2O)3(TCA)2]·NO3·6DMF·2H2O(JOU-27, H3TCA=4,4′,4″-tricarboxyltriphenylamine), has been synthesized by solvothermal method and characterized. Structural analyses show that JOU-27 is a three-dimensional microporous framework based on oxygen-core trinuclear gallium clusters. Due to the introduction of fluorescent ligand, JOU-27 shows strong fluorescence emission and was developed as a fluorescent sensor to detect Fe3+ ion and nitroaromatic compounds. The detection limit of Fe3+ is as low as 2.22×10-6 mol/L(KSV=52823 L/mol, KSV is the Stern-Volmer constant). When the nitrobenzene(NB) concentration is only 3.27×10-3 mol/L, the quenching efficiency can reach 91%. In addition, further studies show that the quenching performance of JOU-27 may be due to the fluorescence resonance energy transfer(FRET) effect, the competition of excitation light absorption, and the electron transfer between the excited state of the framework and nitroaromatics.

Key words: Cationic metal-organic framework, Gallium, Fluorescence sensing, Iron(Ⅲ) ion, Nitroaromatic compound

CLC Number: 

TrendMD: