Synthesis, crystal structure and characterization of two new Cr(III)-substituted polyoxotungstates: [Cr((OCH2)(3)CCH2OH)(2)W6O18](3-) and [H3Cr2W10O38(H2O)(2)](7-)

摘要

A double-side triol functionalized Cr-centered Anderson type polyoxotungstate, K-3[Cr ((OCH2)(3)CCH2OH)(2)W6O18]center dot 3.5H(2)O (CrW6-(tris-CH2OH)(2)) and the first dichromium(III)-substituted metatungstate, NaK6[H3Cr2W10O38(H2O)(2)]center dot 6H(2)O (Cr2W10), were synthesized under hydrothermal conditions and characterized by single-crystal and powder X-ray diffraction analysis, thermogravimetry, elemental analysis and IR spectroscopy. CrW6-(tris-CH2OH)(2) demonstrates that double-side functionalization is possible even in the case when the parent inorganic anion exhibits only three protons in the solid state. Cr2W10 represents the first example of a di-substituted metatungstate anion [H2W12O40](6-). The evidence for the existence of the intact CrW6-(tris-CH2OH)(2) and Cr2W10 in solution and their exact stoichiometric composition was obtained from electrospray-ionization mass spectrometry. (C) 2019 The Authors. Published by Elsevier Ltd.