The 1:1 co-crystal of triphen­yl(2356-tetra­fluoro­benz­yl)phospho­nium bromide and 1122-tetra­fluoro-12-di­iodo­ethane

摘要

The title compound, C25H18F4P⁺·Br⁻·C2F4I2, 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) Å and C—I⋯Br⁻ 177.76 (5)°]. The coordination sphere of the bromide anion is completed by two short HBs of about 2.8 Å (for H⋯Br) with the acidic methyl­ene H atoms and two longer HBs of about 3.0 Å with H atoms of the phenyl rings. Surprisingly neither the second iodine atom of TFDIE nor the H atom on the tetra­fluoro­phenyl group make any short contacts.