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Two rare {M2(MoO4)2} chain-containing molybdate-based metal-organic complexes with a bis-pyrazole-bis-amide ligand:
Xiuli Wang1, Xiang Pan1, Xiang Wang1
1College 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 wangxiuli@bhu.edu.cn wx_2007@163.com +86 416 3400158 +86 416 3400158.
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} (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} 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 -, CrO4 2- and Cr2O7 2-, but 1 being a better photocatalyst towards degradation of cationic dyes methylene blue (MB) and neutral red (NR).
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