4 years ago

Mo2B4O9—Connecting Borate and Metal-Cluster Chemistry

Mo2B4O9—Connecting Borate and Metal-Cluster Chemistry
Hellmut Eckert, Martin K. Schmitt, Amadeus-Samuel Tragl, Dirk Johrendt, Oliver Janka, Christopher Benndorf, Richard Weihrich, Hubert Huppertz, Marcos de Oliveira, Florian Pielnhofer, Bastian Joachim, Rainer Pöttgen
We report on the first thoroughly characterized molybdenum borate, which was synthesized in a high-pressure/high-temperature experiment at 12.3 GPa/1300 °C using a Walker-type multianvil apparatus. Mo2B4O9 incorporates tetrahedral molybdenum clusters into an anionic borate crystal structure—a structural motif that has never been observed before in the wide field of borate crystal chemistry. The six bonding molecular orbitals of the [Mo4] tetrahedron are completely filled with 12 electrons, which are fully delocalized over the four molybdenum atoms. This finding is in agreement with the results of the magnetic measurements, which confirmed the diamagnetic character of Mo2B4O9. The two four-coordinated boron sites can be differentiated in the 11B MAS-NMR spectrum because of the strongly different degrees of local distortions. Experimentally obtained IR and Raman bands were assigned to vibrational modes based on DFT calculations. Come together: In the field of borate crystal chemistry, Mo2B4O9 is the first compound incorporating transition-metal clusters into its crystal structure. The tetrahedral molybdenum clusters and the face-capping oxygen atoms form heterocubane-like [Mo4O4] units. The reduction of a reagent in a high-pressure experiment enabled the combination of two hitherto separated fields of research and revealed an approach to this novel substance class.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201701891

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.