• Tassel, Cédric

Abstract

<jats:p>The success and continued expansion of research on metal-oxo clusters owe largely to their structural richness and wide range of functions. However, while most of them known to date are negatively charged polyoxometalates, there is only a handful of cationic ones, much less functional ones. Here, we show an all-inorganic hydroxyiodide [H<jats:sub>10.7</jats:sub>Sb<jats:sub>32.1</jats:sub>O<jats:sub>44</jats:sub>][H<jats:sub>2.1</jats:sub>Sb<jats:sub>2.1</jats:sub>I<jats:sub>8</jats:sub>O<jats:sub>6</jats:sub>][Sb<jats:sub>0.76</jats:sub>I<jats:sub>6</jats:sub>]<jats:sub>2</jats:sub>·25H<jats:sub>2</jats:sub>O (<jats:bold>HSbOI</jats:bold>), forming a face-centered cubic structure with cationic Sb<jats:sub>32</jats:sub>O<jats:sub>44</jats:sub>clusters and two types of anionic clusters in its interstitial spaces. Although it is submicrometer in size, electron diffraction tomography of<jats:bold>HSbOI</jats:bold>allowed the construction of the initial structural model, followed by powder Rietveld refinement to reach the final structure. The cationic cluster is characterized by the presence of acidic protons on its surface due to substantial Sb<jats:sup>3+</jats:sup>deficiencies, which enables<jats:bold>HSbOI</jats:bold>to serve as an excellent solid acid catalyst. These results open up a frontier for the exploration and functionalization of cationic metal-oxo clusters containing heavy main group elements.</jats:p>

Topics

• impedance spectroscopy
• surface
• cluster
• electron diffraction
• tomography
• laser emission spectroscopy
• forming
• interstitial
• functionalization
• Antimony