A new octa-Mn-substituted poly(polyoxotungstate).

A novel octa-Mn-substituted silicotungstate (ST) [HN(CH)]HNa{[K(HO)WO][SiMnWO]}[SiMnWO]·27HO (1) has been made by the hydrothermal reaction of the trivacant [A-α-SiWO] ({SiW}) building block with Mn and Mn cations in the presence of dimethylamine hydrochloride and systematically characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD) and single crystal X-ray diffraction. 1 is a tetrameric cluster formed by a hexa-Mn substituted cyclic trimeric {[K(HO)WO][SiMnWO]} unit and a {SiMnWO} fragment via two W-O-Mn linkers. Furthermore, its electrochemistry, thermal stability and magnetic properties have been studied.