Synthesis and crystal structure of two polyoxometalate complexes NaH3SiW12O40·17H2O and [Mn(H2O)4]2(H2SiW12O40)2·13H2O

Two polyoxometalate-based complexes, NaH3SiW12O40·17H2O (1) and [Mn(H2O)4]2(H2SiW12O40)2·13H2O (2), have been hydrothermally synthesized and characterized by IR spectra, thermal analysis, and X-ray single crystal diffraction. The results reveal that the Na(I) in 1 is in a distorted octahedral geometry with two coordinated waters and four Ot from four α-[H3SiW12O40]− anions, while each α-[H3SiW12O40]− is connected with four Na(I) by four Ot. The Na–O and hydrogen bonds connect 1 into a 3-D framework. Complex 2 consists of two α-[H2SiW12O40]2− anions and two [Mn(H2O)4]2+ cations, each Mn(II) is coordinated by four waters and two Ot from two α-[H2SiW12O40]2− anions; the clusters are assembled into a 3-D supramolecular network by hydrogen bonds.