title: Substitutional disorder in the ionic diorganoanti-mony halide adduct [bromido/chlorido(0.33/0.67)][2-(di-methyl-amino-meth-yl)phen-yl][2-(di-methyl-ammonio-meth-yl)phen-yl]anti-mony(III) 0.75-bromide 0.25-chloride.
abstract: The title complex, [SbBr(0.33)Cl(0.67)(C(9)H(13)N)(C(9)H(12)N)]Br(0.75)Cl(0.25), exhibits substitutional disorder of both halogen atoms in the asymmetric unit, however, with different occupancies. Thus, the halogen atom bonded to Sb has 0.67 (4) occupancy for Cl and 0.33 (4) for Br, while the anionic halogen atom shows 0.75 (4) occupancy for Br and 0.25 (4) for Cl. An N-H⋯Cl/Br hydrogen bond is established between the cation and the halide anion. The coordination geometry of the Sb center in the cation is distorted pseudo-trigonal-bipyramidal as a result of the strong intra-molecular N→Sb coordination trans to the Sb-Cl/Br bond. The pendant arm on the second ligand is twisted away from the metal center. The compound crystallizes as a racemate, i.e. a mixture of (R(N2),C(Sb1)) and (S(N2),A(Sb1)) isomers with respect to planar chirality induced by the coordinating N atom and chelate-induced Sb chirality. These isomers are associated through C(phen-yl)-H⋯Cl/Br hydrogen bonds, forming a three-dimensional architecture.
authors.affiliation: Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, Arany Janos Street, No. 11, RO-400028, Cluj Napoca, Romania.
authors.forename: Albert P
authors.initials: AP
authors.lastname: Soran
authors.forename: Vilma R
authors.initials: VR
authors.lastname: Bojan