title: Crystal structure of bis-{(S)-1-[2-(di-phenyl-phosphan-yl)ferrocen-yl]-(R)-eth-yl}ammonium bromide di-chloro-methane monosolvate.
abstract: During the synthesis of an FeBr2complex with the PNP ligand (R,R,SFc,SFc)-[Fe2(C5H5)2(C38H35NP2)] (1), single crystals of the di-chloro-methane monosolvate of the Br-salt of the protonated ligand1H+were obtained serendipitously,i.e.[Fe2(C5H5)2(C38H36NP2)]Br·CH2Cl2. The crystal structure of1H·Br·CH2Cl2was 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 CH2Cl2mol-ecules are located in channels extending along <100>. 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.
authors.affiliation: Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163, A-1060 Vienna, Austria.
authors.forename: Afrooz
authors.initials: A
authors.lastname: Zirakzadeh
authors.affiliation: X-Ray Centre, TU Wien, Getreidemarkt 9, A-1060 Vienna, Austria.
authors.forename: Berthold
authors.initials: B
authors.lastname: Stöger
authors.affiliation: Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163, A-1060 Vienna, Austria.
authors.forename: Karl
authors.initials: K
authors.lastname: Kirchner
keywords: PNP ligand; crystal structure; ferrocene; hydrogen bonding