Double-linked chain in POM-based hybrids. Synthesis, crystal structure and properties of an inorganic–organic compound

• Compound 1 is the first example with double-linked POM anionic chain.
• Compound 1 contains a 1D railway-like chain formed by double-linked POM chains and bipy molecules.
• Luminescence and electrochemistry property of the title compound were investigated.

An inorganic–organic compound, (H2bipy)3[(H2O)2Cu2(bpy)3(PMo11CuO39)2]·8H2O(1) (bpy = 4,4-bipyridine), has been prepared under mild hydrothermal conditions and has been structurally characterized by single-crystal X-ray diffraction. In compound 1 the polyoxoanion PMo11CuO395 − has a pseudo-Keggin structure since the Cu(II) atom replaces one Mo(VI) atom of Keggin anion. The polyoxoanions share their terminal oxygen atoms creating an anionic chain. Two adjacent anions in the chain coordinate to same one Cu ion forming a double-linked anionic chain, and then a railway-like chain is constructed by linkage of the bipy molecules to Cu atoms in which the double-linked anionic chains act as two rails of the railway and bipy molecules act as “crosstie”. The 3D supramolecular structure is formed from the railway-like chains through hydrogen bonds and strong π…π stacking interactions. The fluorescent emission of compound 1 from 4,4′-bipyridine ligand was detected and the photocatalysis property for degradation of methylene blue (MB) of compound 1 upon a UV irradiation was examined.

A 1-D railway-like framework build by mono-copperII substituted molybdophosphate units and [Cu2(bipy)3] complex has been synthesized and characterized structurally. The electrochemical properties of the title compounds are also investigated.Figure optionsDownload as PowerPoint slide