Synthesis, crystal structure, and properties of three supramolecular compounds based on Keggin-type phosphomolybdate and different flexible ligands

Three supramolecular compounds based on Keggin phosphomolybdate and different flexible ligands, Cu-3(bei)(6)(PMo12O40)(2)6H(2)O (1), (H(2)bbi)(Hbbi)(PMo12O40)2H(2)O (2), and (H(2)bpp)(3)(PMo12O40)(2)6H(2)O (3) (bei = 1,1'-(1,2-ethanediyl)bis(imidazole), bbi = 1,1'-(1,4-butanediyl)bis(imidazole), bpp = 1,3-bi(4-pyridyl)propane)), have been hydrothermally prepared and characterized by elemental analysis, IR, TG, XRD, and single-crystal X-ray diffraction. Crystal data analysis reveals that 1-3 are composed of discrete [Cu(bei)(2)](2+) complex cations, protonated bbi and bpp cations, respectively, with [PMo12O40](3-). All three compounds exhibit interesting supramolecular frameworks via electrostatic interactions and hydrogen bonds. Their electrochemistry, electrocatalytic behavior, and solid state fluorescence at room temperature have been investigated.