1-(2-Methylphenyl)-4,4′-bipyridin-1-ium tetrafluoridoborate

Abstract

Crystals of the title compound, C17H15N2 +·BF4 −, were unexpectedly grown from crystallization attempts of [Pt(4,4′-bpy)4](BF4)2 [Smith et al. (2019). Comments Inorg. Chem. 39, 188–215] using toluene and acetonitrile. The tetrafluoroborate anion and the central pyridinium ring of the cation are disordered, with atomic site occupancies close to ½. The tolyl group of the cation has a 75.31 (11)° twist relative to the unsubstituted pyridyl group. This rotation allows for a centrosymmetric dimer of cations with weak hydrogen bonding between the pyridyl nitrogen atom and a methyl H atom on the neighbouring cation.