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During the synthesis of an FeBr 2 complex with the PNP ligand ( R , R , S  Fc , S  Fc )-[Fe 2 (C 5 H 5 ) 2 (C 38 H 35 NP 2 )] ( 1 ), single crystals of the di-chloro-methane monosolvate of the Br - salt of the protonated ligand 1 H + were obtained serendipitously, i.e. [Fe 2 (C 5 H 5 ) 2 (C 38 H 36 NP 2 )]Br·CH 2 Cl 2 . The crystal structure of 1 H·Br·CH 2 Cl 2 was determined by single-crystal X-ray diffraction. The mean bond lengths in the ferrocene units are Fe-C = 2.049 (3) Å and C-C = 1.422 (4) Å within the cyclo-penta-dienyl rings. The mean C-N bond length is 1.523 (4) Å. The inter-planar angle between the two connected cyclo-penta-dienyl rings is 49.2 (2)°. One ferrocene moiety adopts a staggered conformation, whereas the other is between staggered and eclipsed. The Br - ions and the CH 2 Cl 2 mol-ecules are located in channels extending along &lt;100&gt;. One ammonium H atom forms a hydrogen bond with the Br - ion [H⋯Br = 2.32 (4) Å and C-H⋯Br = 172 (3)°]. The second ammonium H atom is not involved in hydrogen bonding.

Crystal structure of bis{(S)-1-[2-(diphenylphosphanyl)ferrocenyl]-(R)-ethyl}ammonium bromide dichloromethane monosolvate