A novel sandwich-type polyoxometalate compound with visible-light photocatalytic H2evolution activityElectronic supplementary information (ESI) available: UV-Vis spectrum of Na10[α-SiW9O34]·xH2O, Single crystal data, XRD pattern, TGA, FT-IR spectrum of compound 1. CCDC 799005. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c0cc04697c

A tin(ii) tungstosilicate derivative K11H[Sn4(SiW9O34)2]·25H2O with four sandwiched Sn2+cations was prepared by reaction of SnCl2, KCl and Na10[α-SiW9O34]·xH2O. Visible-light photocatalytic H2evolution activity was observed with Pt nanoparticles as co-catalyst and methanol as sacrificial agent. [ABSTRACT FROM AUTHOR]