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[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 BrF5 molecules. It is the most BrF5-rich fluoridobromate anion by mass. Quantum-chemical calculations showed that the μ4-F-Br bonds within the anion are essentially ionic in nature. The compound is the first example where F atoms bridge μ4-like neither to metal nor to hydrogen atoms. It was characterized by Raman spectroscopy and by single-crystal X-ray diffraction. The latter showed surprisingly that its crystal structure is related to the intermetallic half-Heusler compound and structure type MgAgAs.

SUBMITTER: Mobs M 

PROVIDER: S-EPMC10901516 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature

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[Br<sub>4</sub>F<sub>21</sub>]<sup>-</sup> - a unique molecular tetrahedral interhalogen ion containing a μ<sub>4</sub>-bridging fluorine atom surrounded by BrF<sub>5</sub> molecules.

Möbs Martin M   Graubner Tim T   Karttunen Antti J AJ   Kraus Florian F  

Chemical science 20240120 9


The reaction of [NMe<sub>4</sub>][BrF<sub>6</sub>] with an excess of BrF<sub>5</sub> leads to the compound [NMe<sub>4</sub>][Br<sub>4</sub>F<sub>21</sub>]·BrF<sub>5</sub>. It features molecular [(μ<sub>4</sub>-F)(BrF<sub>5</sub>)<sub>4</sub>]<sup>-</sup> anions of tetrahedron-like shape containing central μ<sub>4</sub>-bridging F atoms coordinated by four BrF<sub>5</sub> molecules. It is the most BrF<sub>5</sub>-rich fluoridobromate anion by mass. Quantum-chemical calculations showed that the μ<  ...[more]

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