Hydrothermal synthesis, crystal structure and properties of a 3D-framework polyoxometalate assembly: [Ag(4,4′-bipy)](OH){[Ag(4,4′-bipy)]2[PAgW12O40]}·3.5H2O

A 3D framework assembly based on the Keggin tungstophosphate POM with silver (I) transition metal and N-ligand organic moiety and of formula [Ag(4,4′-bipy)](OH){[Ag(4,4′-bipy)]2[PAgW12O40]}·3.5H2O (1) (bipy=bipyridine) has been synthesized by hydrothermal method and structurally characterized. The crystal of 1 belongs to triclinic, space group P-1, image, image, image, image, image, image, image, image, image, image. The final statistics based on F2 are GOF=1.045, image and image for image. X-ray diffraction analysis revealed that the molecular structure of 1 consists of a neutral fragment {[AgI(4,4′-bipy)]2[PAgIWVI12O40]}, [AgI(4,4′-bipy)]+ cation, hydroxide anion and lattice water molecules. The {[AgI(4,4′-bipy)]2[PAgIWVI12O40]} subunits are interconnected through Ag(I) with bipyridine ligands, both surface bridging and terminal oxygen atoms of polyoxoanions (POMs) to represent a novel three-dimensional (3D) polymer with 1D elliptic channels. Meanwhile, the [AgI(4,4′-bipy)]+ cations are also linked each other to form 1D chains, and embedded in 1D elliptic channels.