Two rare {M2(MoO4)2}n chain-containing molybdate-based metal–organic complexes with a bis-pyrazole-bis-amide ligand: fluorescent sensing and photocatalysis performance |
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| Authors: | Xiuli Wang Xiang Pan Xiang Wang Yan Li Guocheng Liu |
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| Institution: | College of Chemistry and Chemical Engineering, Professional Technology Innovation Center of Liaoning Province for Conversion Materials of Solar Cell, Bohai University, Jinzhou 121013 P. R. China, Fax: +86 416 3400158, +86 416 3400158 |
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| Abstract: | By introducing a bis-pyrazole-bis-amide ligand, N,N′-bis(1H-pyrazole-4-carboxamide)-1,4-benzene (L), two molybdate-based metal–organic complexes containing {M2(MoO4)2}n (M = Co, Zn), Co2L2(MoO4)2]·H2O (1), Zn2L2(MoO4)2]·H2O (2), have been prepared under hydrothermal/solvothermal conditions. X-ray diffraction analyses reveal that both 1 and 2 are isostructural. An interesting structural feature is that a kind of {M2(MoO4)2}n chain could be found in 1 and 2, although different raw materials Mo7O24]6− and PMo12O40]3− anions were utilized. Then these chains are further linked by L ligands into a two dimensional (2D) structure. The title complexes represent the first examples containing {MoO4} units and pyrazole-/or amide-derivative ligands. Complexes 1 and 2 exhibit distinct performances due to different metal centers, with 2 acting as a fluorescent sensor for Fe3+, MnO4−, CrO42− and Cr2O72−, but 1 being a better photocatalyst towards degradation of cationic dyes methylene blue (MB) and neutral red (NR).Two molybdate-based complexes containing {M2(MoO4)2}n (M = Co or Zn) chains were obtained, which demonstrated different properties: excellent photocatalytic degradation performance of cationic dyes for 1 and fluorescence sensing behavior for 2. |
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