3D-architecture via self-assembly of Krebs-type polyoxometalate {Na-10(H2O)(26)][Sb2W20Zn2O70(H2O)(6)]}

摘要

A novel Krebs-type polyoxometalate [Na-10(H2O)(26)][Sb2W20Zn2O70(H2O)(6)] (Zn2W2) (1) was fabricated from one-pot transformations of the trilacunary Keggin-type [B-alpha-SbW9O33](9-) precursor, followed by Zn2+/Na+-assisted self-assembly of the Krebs-type polyanion. The {Zn2W2} polyanion was further self-assembled into 3D architecture with new topology by adjusting Na+ cations. The compound {Zn2W2} (1) was fully characterized with a wide range of analytical methods, including single crystal/powder X-ray diffraction, thermogravimetric analysis (TGA) and various spectroscopic techniques (FT-IR, Raman, UV-vis). Electrochemical performance of {Zn2W2} polyanion was also investigated by cyclic voltammetry (CV) in sodium acetate buffer solution. Moreover, compound {Zn2W2} (1) is an effective catalyst for the oxidation of cyclohexanol with hydrogen peroxide. (C) 2018 Elsevier Ltd. All rights reserved.