Imaging an unsupported metal-metal bond in dirhenium molecules at the atomic scale.

Autor: Cao K; Central Facility for Materials Science Electron Microscopy, Ulm University, Albert-Einstein-Allee 11, Ulm 89081, Germany., Skowron ST; School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK., Biskupek J; Central Facility for Materials Science Electron Microscopy, Ulm University, Albert-Einstein-Allee 11, Ulm 89081, Germany., Stoppiello CT; School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK., Leist C; Central Facility for Materials Science Electron Microscopy, Ulm University, Albert-Einstein-Allee 11, Ulm 89081, Germany., Besley E; School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK., Khlobystov AN; School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK., Kaiser U; Central Facility for Materials Science Electron Microscopy, Ulm University, Albert-Einstein-Allee 11, Ulm 89081, Germany.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2020 Jan 17; Vol. 6 (3), pp. eaay5849. Date of Electronic Publication: 2020 Jan 17 (Print Publication: 2020).
DOI: 10.1126/sciadv.aay5849
Abstrakt: Metallic bonds remain one of the most important and least understood of the chemical bonds. In this study, we generated Re 2 molecules in which the Re-Re core is unsupported by ligands. Real-time imaging of the atomic-scale dynamics of Re 2 adsorbed on a graphitic lattice allows direct measurement of Re-Re bond lengths for individual molecules that changes in discrete steps correlating with bond order from one to four. Direct imaging of the Re-Re bond breaking process reveals a new bonding state with the bond order less than one and a high-amplitude vibrational stretch, preceding the bond dissociation. The methodology, based on aberration-corrected transmission electron microscopy imaging, is shown to be a powerful analytical tool for the investigation of dynamics of metallic bonding at the atomic level.
(Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).)
Databáze: MEDLINE
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