The 1:1 co-crystal of triphenyl(2,3,5,6- tetrafluorobenzyl)phosphonium bromide and 1,1,2,2-tetrafluoro-1,2-diiodoethane

0.030; wR factor = 0.077; data-to-parameter ratio = 25.7. The title compound, C25H18F4P +BrC2F4I2, is a 1:1 co-crystal of triphenyl(2,3,5,6-tetrafluorobenzyl)phosphonium (TTPB) bromide and 1,1,2,2-tetrafluoro-1,2-diiodoethane (TFDIE). The crystal structure consists of a framework of TTPB cations held together by C—H Br interactions. In this framework, infinite channels along [100] are filled by TFDIE molecules held together in infinite ribbons by short F F [2.863 (2)– 2.901 (2)Å] interactions. The structure contains halogen bonds (XB) and hydrogen bonds (HB) in the bromide coordination sphere. TFDIE functions as a monodentate XB donor as only one I atom is linked to the Br anion and forms a short and directional interaction [I Br 3.1798 (7) A ̊ and C—I Br 177.76 (5)]. The coordination sphere of the bromide anion i