The crystal structure of the title salt, C44H38P2
2+2BF4
−, consists of discrete dications interlaced with the BF4
− counter-ions. In each cation, both phosphonium groups lie on the same side of the plane of the central benzene ring. The tetrafluoroborate anions are involved in intensive thermal motion, thus some B—F bond lengths [range 1.329 (6) to 1.391 (6) Å] deviate significantly from their standard values.