[Br₄F₂₁]⁻ – a unique molecular tetrahedral interhalogen ion containing a μ₄-bridging fluorine atom surrounded by BrF₅ molecules

Abstract

The reaction of [NMe4][BrF6] with an excess of BrF5 leads to the compound [NMe4][Br4F21]·BrF5. It features molecular [(µ4-F)(BrF5)4]– anions of tetrahedron-like shape containing central µ4-bridging F atoms coordinated by four...