3D framework constructed from Keggin polymolybdate anion covalently linked by meso-helical mixed-valence copper(I/II) complex

A new inorganic–organic hybrid image (1), (pda = 1,2-propanediamine, bpy = 4,4′-bipyridine), was synthesized by hydrothermal method and its structure was determined by X-ray crystallography. The copper(I/II) complex located in 1 shows an unusual meso-helical chain structure. Different intertwined chains further connected with Keggin-type polyoxoanions by covalent Cu–Ot (terminal oxygen atom from polyanion) bonds to form 3D framework. The electrochemical and luminescence properties of 1 were investigated.