Mixed Noble‐Gas Compounds of Krypton(II) and Xenon(VI); [F5Xe(FKrF)AsF6] and [F5Xe(FKrF)2AsF6]

다국어 초록 (Multilingual Abstract)

The coordination chemistry of KrF2 has been limited in contrast with that of XeF2, which exhibits a far richer coordination chemistry with main‐group and transition‐metal cations. In the present work, reactions of [XeF5][AsF6] with KrF2 in anhydrous HF solvent afforded [F5Xe(FKrF)AsF6] and [F5Xe(FKrF)2AsF6], the first mixed krypton/xenon compounds. X‐ray crystal structures and Raman spectra show the KrF2 ligands and [AsF6]− anions are F‐coordinated to the xenon atoms of the [XeF5]+ cations. Quantum‐chemical calculations are consistent with essentially noncovalent ligand−xenon bonds that may be described in terms of σ‐hole bonding. These complexes significantly extend the XeF2–KrF2 analogy and the limited chemistry of krypton by introducing a new class of coordination compound in which KrF2 functions as a ligand that coordinates to xenon(VI). The HF solvates, [F5Xe(FH)AsF6] and [F5Xe(FH)SbF6], are also characterized in this study and they provide rare examples of HF coordinated to xenon(VI).
KrF2 and [XeF5][AsF6] react in anhydrous HF to form [F5Xe(FKrF)AsF6] and [F5Xe(FKrF)2AsF6]. The complexes were structurally characterized by low‐temperature single‐crystal X‐ray diffraction and Raman spectroscopy. The KrF2 ligands interact with xenon(VI) through Xe‐ ‐ ‐FKrF secondary bonds that are shown by computational studies to be noncovalent, electrostatic, σ‐hole interactions. The complexes provide unique examples of mixed noble‐gas compounds.