Chemical Journal of Chinese Universities ›› 2020, Vol. 41 ›› Issue (2): 253-261.doi: 10.7503/cjcu20190493

• Articles:Inorganic Chemistry • Previous Articles     Next Articles

Transition Metal Coordination Polymers Constructed by 4-(4-Carboxyphenoxy)isophthalic Acid: Synthesis, Crystal Structure, Fluorescence Sensing and Photocatalysis

LIU Dongmei,SU Yajing,LI Shanshan,XU Qiwei,LI Xia()   

  1. Department of Chemistry, Capital Normal University, Beijing 100048, China
  • Received:2019-09-16 Online:2020-02-10 Published:2019-10-29
  • Contact: Xia LI E-mail:xiali@cnu.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21471104);the Laboratory Opening Fund of Capital Normal University, China(LIP18009S047)

Abstract:

Four new transition metal coordination polymers, [Zn(Hcpoia)(2,2'-bpy)·H2O]n(1) and [M(Hcpoia)(phen)]n·nH2O[M=Zn(2), Mn(3), Co(4); H3cpoia=4-(4-carboxyphenoxy)isophthalic acid; 2,2'-bpy=2,2'-bipyridine; phen=1,10-phenanthroline], were synthesized by hydrothermal method and characterized by X-ray single crystal diffraction(XRD). Complex 1 features a one-dimensional chain structure, and Zn 2+ ions adopt a [ZnO4N2] distorted octahedral configuration. Zn 2+ ions are linked by Hcpoia 2- ligands through μ1η 1η 0 and μ1η 1η 1 coordination modes. The structures of complexes 2 and 4 are similar to that of complex 1 with one-dimensional chain structure, which is formed by Hcpoia 2- ligands connecting [MO4N2] structural units through μ1η 1η 0/μ1η 1η 1 coordination modes. The one-dimensional chains of complexes 1, 2 and 4 are developed into two-dimensional structures by intermolecular hydrogen bonds. Complex 3 has a two-dimensional network structure, in which Mn 2+ ions take a [MnO4N2] distorted octahedral configuration. Hcpoia 2- ligands link adjacent Mn 2+ ions through μ1η 1η 0 and μ1η 1η 1 coordination modes to form [Mn2COO2] binuclear units. The binuclear units are connected by Hcpoia 2- ligands to form a two-dimensional structure. In complexes 1—4, both 2,2'-bpy and phen ligands as terminal groups chelate to metal ions. The effects of antibiotics and Fe 3+ ions in aqueous solution on the fluorescence intensity of complex 1 were studied. The results show that metronidazole and Fe 3+ ions exert quenching effects on fluorescence of complex 1. The effects of various concentrations of metronidazole and Fe 3+ ions on the fluorescence intensity of complex 1 were further studied. Based on the fluorescence quenching mechanism, complex 1 can be used as a fluorescence sensor for detection of metronidazole and Fe 3+ ions in aqueous solution. The catalytic performance of complex 4 on RhB was studied. The experimental results show that complex 4 has good photocatalytic degradation of RhB in the presence of hydrogen peroxide and xenon lamp irradiation.

Key words: Transition metal coordination polymer, Crystal Structure, Fluorescence, Photocatalysis

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