A supramolecular metal-organic framework derived from bismuth iodide and 4,4′-bipyridinium derivative: Synthesis, structure and efficient adsorption of dyes

• An interesting BiI3 oligomeric structure was prepared through solvothermal route.
• Compound 1 is a 2D supramolecular network with channels.
• It can readily and quickly adsorb rhodamine B (RhB) and methylene blue.

The solvothermal reaction of a mixture of bismuth iodide, flexible cationic compound 1,1″-(1,4-butanediyl)bis[4,4′-bipyridinium] bis[tetrafluoroborate] (bbpyf) and HI at the temperature of 110 °C resulted in a novel compound, namely [bbpy][Bi4I16] (1). The structure of compound 1 was explored with IR spectroscopy, thermal gravimetric analysis (TGA), PXRD, UV–vis diffuse reflectance spectra and single-crystal X-ray diffraction in the solid state. Compound 1 was a 2D supramolecular structure consisted of one linear cationic compound bbpy2+ and inorganic anion cluster [Bi4I16]2− and contained a channel of 11.214 × 9.727 Å via noncovalent interactions. In addition, the adsorption behavior of 1 was also investigated. And it could adsorb methylene blue (MB) and Rhodamine B (RhB) from waste water fast and effectively, highlighting its potential application for environmental issues.

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