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JOURNAL OF SYNTHETIC CRYSTALS ›› 2024, Vol. 53 ›› Issue (2): 307-314.

• Research Articles • Previous Articles     Next Articles

Synthesis, Structure and Fluorescence Sensing Property of Manganese Metal-Organic Framework Based on 5-Aminonicotinic Acid

JIANG Tao1, LIANG Xiaotong1, LIAO Siyan2, LIU Xiaohui1, YU Jiajun1, ZOU Lin1, QIU Yanxuan1   

  1. 1. School of Chemistry and Materials Science, Guangdong University of Education, Guangzhou 510303, China;
    2. School of Pharmaceutical Sciences, Guangzhou Medical University, Guangzhou 511436, China
  • Received:2023-09-04 Online:2024-02-15 Published:2024-02-04

Abstract: A new three-dimension manganese(II) metal-organic framework [Mn2(5-ana)4(H2O)]n (namely Mn-MOF) has been successfully constructed by the reaction of 5-aminonicotinic acid (5-Hana) and MnCl2 using solution method at room temperature. The structure and properties of Mn-MOF were characterized by X-ray single-crystal diffraction, X-ray powder diffraction, elemental analysis, infrared spectroscopy, thermogravimetric analysis, ultraviolet-visible spectra and luminescent spectra. Structural analysis reveal that the as-synthesized complex crystallized in the monoclinic system and feature a binodal (2,8)-connected coordination network. The [Mn2(CO2)2(H2O)] dimeric unit acts as 8-connected node and 5-ana- ligand acts as 2-connected node. Electrostatic potential (ESP) on molecular van der Waals surface analysis of 5-ana- ligand shows that the first reactive site exists in the surface close to the oxygen atoms of carboxyl group with the ESP global minimum of -143.37 kcal·mol-1. The second and third reactive sites exist in the nitrogen atoms of pyridine ring and amino, respectively. Mn-MOF displays good thermal stability at room temperature. Fluorescence spectroscopy measurement reveals that the complex shows emission maximum at 402 nm upon 256 nm light excitation. More importantly, Mn-MOF exhibits sensing selectivity for Fe3+ by fluorescence quenching with the quenching efficiency up to 98.71%, which makes it as a potential luminescent sensor for analyzing Fe3+ in aqueous solution.

Key words: 5-aminonicotinic acid, Mn(II), crystal structure, metal-organic framework, fluorescent sensor, iron ion

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