A series of novel polyoxometalate-based Ag-I-complexes constructed from asymmetric pyridyl-monoamide ligand: Synthesis, structures and selective separation of cationic dyes

作者：Wang, Xiu-Li^*; Rong, Xing; Lin, Hong-Yan; Liu, Dan-Na; Wang, Xiang; Liu, Guo-Cheng; Song, Ge

来源：Inorganica Chimica Acta, 2017, 461: 279-289.

DOI：10.1016/j.ica.2017.02.033

• Polyoxometalate
• Asymmetric pyridyl-monoamide ligand
• Electrochemical property
• Adsorption behaviour
• Selective adsorption

To explore the new functional polyoxometalates (POMs)-based metal-organic complexes (MOCs), the asymmetric pyridyl-monoamide ligand N-(pyridin-3-yl)isonicotinamide (PIA) was chosen to assemble with POMs and AgI ions under the hydrothermal condition. Four novel POMs-based Ag(I)-MOCs [Ag-3(PIA)(3)][Ag(SiW12O40)] (1), [Ag-3(PIA)(3)][Ag((VW11WO40)-W-VI-O-V)] (2), H[Ag3Na2(H2O)(2)(PIA)(6)(VW12O40)(2)]center dot 8H(2)O (3), Ag-2(PIA)(2)(HPMo12O40)center dot H2O (4) were obtained. Characterized by single-crystal X-ray diffraction analyses, 1 and 2 are isostructural 3D frameworks constructed from 1D [Ag3(PIA)3] chains and 1D [Ag(POM)] chains; 3 exhibits a 1D chain, which was extended into a 3D supramolecular framework through the non-covalent interactions; while 4 shows a 3D structure based on 1D [Ag-2(PIA)(2)] chains and PMo12O403 anions. The adsorption behaviors for organic dyes of the title complexes were systematically investigated. All the title complexes show efficient adsorption capacity for cationic dyes (MB/RhB), and selective separation ability for the cationic dye MB from the mixture of MB and anionic dye MO. At the same time, complex 2 also can selectively adsorb MB molecules from binary cationic dyes mixtures of MB and RhB. In addition, the electrochemical properties of the title complexes also have been investigated in detail.

• 出版日期2017-5-1
• 单位渤海大学