Two salts of the 6,6-di­fluoro-6H-dibenzo[c,e][1,2]oxaborinin-6-ide anion with different cations

The crystal structures are reported of the 6,6-di­fluoro-6H-dibenzo[c,e][1,2]oxaborinin-6-ide (or 9,9-di­fluoro-10-oxa-9-boraphenanthren-9-ide) anion with two different cations, namely, potassium 6,6-di­fluoro-6H-dibenzo[c,e][1,2]oxaborinin-6-ide, K+·C12H8BF2O−, (II), featuring a polymeric structure, and bis­(tetra­phenyl­phospho­nium) bis­(6,6-di­fluoro-6H-dibenzo[c,e][1,2]oxaborinin-6-ide) aceto­nitrile tris­olvate, 2C24H20P+·2C12H8BF2O−·3CH3CN, (III), which is composed of discrete cations, anions and aceto­nitrile solvent mol­ecules linked by C—H⋯O, C—H⋯N and C—H⋯F hydrogen bonds. There are only minor differences in the geometrical parameters of the anions in these structures.