Synthesis and crystal structure of two polyoxometalate complexes NaH 3 SiW 12 O 40 ·17H 2 O and [Mn(H 2 O) 4 ] 2 (H 2 SiW 12 O 40 ) 2 ·13H 2 O.

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) in1is in a distorted octahedral geometry with two coordinated waters and four Otfrom four α-[H3SiW12O40]−anions, while each α-[H3SiW12O40]−is connected with four Na(I) by four Ot. The Na–O and hydrogen bonds connect1into a 3-D framework. Complex2consists of two α-[H2SiW12O40]2−anions and two [Mn(H2O)4]2+cations, each Mn(II) is coordinated by four waters and two Otfrom two α-[H2SiW12O40]2−anions; the clusters are assembled into a 3-D supramolecular network by hydrogen bonds. [ABSTRACT FROM PUBLISHER]