Synthesis and characterization of a new (1D+1D) polyoxometalate-based polypseudo-rotaxane coordination polymer

Highlights: • A novel (1D+1D) polyoxometalate-based polypseudo-rotaxane coordination polymer was synthesized. • The polypseudo-rotaxane framework was constructed by tungstovanadtates ladder motif and zigzag metal-organic chains. • Compound1could act as stationary phase to selectively adsorb cationic dyes with rapid adsorption rate. -- Abstract: A new polyoxometalate-based coordination polymer, Ag₂(L)₂(VW₁₂O₄₀)][Ag₂(L)₂]·4H₂O (1) {L = 3,5-di(1H-1,2,4-triazol-1-yl)benzoic acid}, has been isolated under hydrothermal conditions and characterized by routine methods. Compound 1 exhibits an interesting 1D + 1D polypseudo-rotaxane architecture, as shown by X-ray diffraction analysis. The new compound represents a scarce example of 1D + 1D polypseudo-rotaxane architecture, namely, ladder motifs are threaded by zigzag chains rather than a straight one. The coordination stability around loop and thread motifs was investigated to expatiate on the zigzag chained polypseudo-rotaxane. In addition, crystal 1 can be used as a packing material to selectively adsorb cationic dyes such as crystal violet (CV) and methylene blue (MB) concomitant with methyl orange anionic dyes with high uptakes and rapid adsorption rate.