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Unconventional Metal-Framework Interaction in MgSi 5 .
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2019 Sep 09; Vol. 58 (37), pp. 12914-12918. Date of Electronic Publication: 2019 Aug 19. - Publication Year :
- 2019
-
Abstract
- The silicon-rich cage compound MgSi <subscript>5</subscript> was obtained by high-pressure high-temperature synthesis. Initial crystal structure determination by electron diffraction tomography provided the basis for phase analyses in the process of synthesis optimization, finally facilitating the growth of single crystals suitable for X-ray diffraction experiments. The crystal structure of MgSi <subscript>5</subscript> (space group Cmme, Pearson notation oS24, a=4.4868(2) Å, b=10.1066(5) Å, and c=9.0753(4) Å) constitutes a new type of framework of four-bonded silicon atoms forming Si <subscript>15</subscript> cages enclosing the Mg atoms. Two types of smaller Si <subscript>8</subscript> cages remain empty. The atomic interactions are characterized by two-center two-electron bonds within the silicon framework. In addition, there is evidence for multi-center Mg-Si bonding in the large cavities of the framework and for lone-pair-like interactions in the smaller empty voids.<br /> (© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Volume :
- 58
- Issue :
- 37
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 31339624
- Full Text :
- https://doi.org/10.1002/anie.201907432