10.6084/m9.figshare.997705.v3 Yue Zhao Yue Zhao Kai-Cheng Xu Kai-Cheng Xu Ying Song Ying Song The syntheses, crystal structures, and characterizations of two Mn<sup>II/III</sup>-sandwiching polyoxometalate complexes based on [<i>α</i>-SeW<sub>9</sub>O<sub>33</sub>]<sup>8−</sup> units Taylor & Francis Group 2014 characterizations polyoxometalate complexes units 2014-05-21 16:37:32 Journal contribution https://tandf.figshare.com/articles/journal_contribution/The_syntheses_crystal_structures_and_characterizations_of_two_Mn_sup_II_III_sup_sandwiching_polyoxometalate_complexes_based_on_i_945_i_SeW_sub_9_sub_O_sub_33_sub_sup_8_8722_sup_units/997705 <div><p>Two sandwich-type polyoxometalates (POM) based on [<i>α</i>-SeW<sub>9</sub>O<sub>33</sub>]<sup>8−</sup> building blocks, K<sub>8</sub>[{Mn<sup>II</sup>(H<sub>2</sub>O)}<sub>2</sub>(WO)(SeW<sub>9</sub>O<sub>33</sub>)<sub>2</sub>]·12H<sub>2</sub>O (<b>1</b>) and K<sub>6</sub>[{Mn<sup>III</sup>(H<sub>2</sub>O)}<sub>2</sub>(WO)(SeW<sub>9</sub>O<sub>33</sub>)<sub>2</sub>]·18H<sub>2</sub>O (<b>2</b>), have been synthesized and characterized by elemental analyses, IR, diffuse reflectance UV–vis-NIR spectra, TG, X-ray photoelectron spectroscopy, and single-crystal X-ray diffraction. Electrochemical properties and photocatalytic activities have also been investigated. Single-crystal X-ray diffraction analysis shows that the polyoxoanions of <b>1</b> and <b>2</b> have similar sandwich structures composed of [<i>α</i>-SeW<sub>9</sub>O<sub>33</sub>]<sup>8−</sup> units except for different oxidation states of Mn centers (II for <b>1</b>, III for <b>2</b>). Compound <b>2</b> is the first high-valent trinuclear-manganese (III)-substituted [<i>α</i>-SeW<sub>9</sub>O<sub>33</sub>]<sup>8−</sup>-based POM. Cyclic voltammograms of <b>1</b> and <b>2</b> show irreversible redox processes for Mn<sup>2+</sup> and Mn<sup>3+</sup>, respectively. Compound <b>2</b> has better photocatalytic properties with photocatalytic degradation of Rhodamine-B (RhB) compared to <b>1</b>.</p></div>