Construction of one- to two-dimensional POM-based compounds through adjusting the metal cations and polyanions

Three compounds, [Na(bie)]2H[PW12O40] (1), [Cu(bie)]4[SiW12O40] (2) and [Cu(bie)]3H2[H3W12O40] (3) (bie = 2,2′-bis(1H-imidazolyl)ether) have been hydrothermally synthesized by introducing different metal cations and polyanions, and characterized by routine physical methods. Their crystal structures have been established by single crystal X-ray diffraction. Compound 1 shows a 1D infinite chain which is composed of Na-bie coordination polymers and PW12 polyanions. By using the CuI cation, compounds 2 and 3 which show the 2D layer architectures were obtained. Due to the different polyanions of compounds 2 and 3, the topologies of the 2D layers are distinct. Further, the electrochemical properties of compounds 1-3 were studied.