Crystal structures of potassium tri­fluorido­(4-meth­oxy­phen­yl)borate and potassium tri­fluorido(4-fluoro­phen­yl)borate

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The title compounds, K(+)·C7H7BF3O(-), (I), and K(+)·C6H4BF4 (-), (II), are mol-ecular salts containing para-substituted phenyl-tri-fluorido-borate anions. In each compound, the B atom adopts a distorted tetra-hedral BCF3 geometry. Despite their different compositions and space groups, the irregular KF8 coordination polyhedra of the potassium cations in the structures are almost identical. These polyhedra share faces and edges, generating infinite (010) layers in (I) and infinite (001) layers in (II). In (I), adjacent layers are stacked in an AAA… fashion, whereas in (II), they are stacked in an ABAB… sequence.

Original languageEnglish
Pages (from-to)68-71
Number of pages4
JournalActa Crystallographica Section E: Structure Reports Online
Issue number8
Early online date19 Jul 2014
Publication statusPublished - 1 Aug 2014

Bibliographical note

We thank the National Crystallography Service (University of Southampton) for the data collections.


  • Crystal structure
  • Boron
  • Lewis acid
  • Layered structure


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