title: Coordination of KrF2to a Naked Metal Cation, Mg2.
abstract: Examples of coordination compounds in which KrF2functions as a ligand are very rare. In contrast, XeF2provides a rich coordination chemistry with a variety of main-group and transition metal cations. The reactions of Mg(AsF6)2and KrF2in HF or BrF5solvent have afforded [Mg(KrF2)4(AsF6)2] and [Mg(KrF2)4(AsF6)2]⋅2 BrF5, respectively, the first examples of a metal cation ligated by KrF2. Their X-ray crystal structures and Raman spectra show that the KrF2ligands and [AsF6]-anions are F-coordinated to a naked Mg2+cation. Quantum-chemical calculations are consistent with essentially non-covalent ligand-metal bonding. These compounds significantly extend the XeF2-KrF2analogy and the limited chemistry of krypton by introducing a new class of coordination compound in which KrF2functions as a ligand towards a naked metal cation.
authors.affiliation: Department of Chemistry, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.|Department of Inorganic Chemistry and Technology, "Jožef Stefan" Institute, Jamova 39, 1000, Ljubljana, Slovenia.
authors.forename: Matic
authors.identifier: 0000-0002-1864-4248
authors.initials: M
authors.lastname: Lozinšek
authors.affiliation: Department of Chemistry, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.
authors.forename: Hélène P A
authors.identifier: 0000-0002-8716-2330
authors.initials: HPA
authors.lastname: Mercier
authors.affiliation: Department of Chemistry, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.
authors.forename: David S
authors.identifier: 0000-0003-3101-0706
authors.initials: DS
authors.lastname: Brock
authors.affiliation: Department of Inorganic Chemistry and Technology, "Jožef Stefan" Institute, Jamova 39, 1000, Ljubljana, Slovenia.
authors.forename: Boris
authors.identifier: 0000-0003-3402-162X
authors.initials: B
authors.lastname: Žemva
authors.affiliation: Department of Chemistry, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.
authors.forename: Gary J
authors.identifier: 0000-0001-5109-6979
authors.initials: GJ
authors.lastname: Schrobilgen
keywords: Raman spectroscopy; X-ray crystallography; coordination compounds; hypervalent compounds; krypton difluoride