ABSTRACT: A small quantity of the title compound, C(8)H(20)N(2) (2+)·2Br(-), was formed as a by-product in a reaction between a diamine and an alkyl bromide. The asymmetric unit contains half of a centrosymmetric dication and a bromide anion. In the crystal, weak inter-molecular C-H?Br hydrogen bonds consolidate the crystal packing.
Project description:In the crystal structure of the title compound, C(20)H(38)N(2) (2+)·2Br(-), the centroid of the aromatic ring is located on an inversion center, so that the asymmetric unit consists of one-half mol-ecule of the dication and one bromide anion. C-H?Br inter-actions connect the two components into a three-dimensional network. An intra-molecular C-H?? inter-action is also observed.
Project description:In the title compound, C(20)H(18)N(2) (2+)·2Br(-)·2H(2)O, the complete dication is generated by a crystallographic centre of symmetry. In the crystal, O-H?Br, C-H?Br and C-H?O hydrogen bonds and ?-? stacking [shortest centroid-centroid separation = 3.657?(2)?Å] help to establish the packing.
Project description:In the title compound, C(22)H(24)N(4) (2+)·2Br(-), the imidazolium dication is located on a crystallographic inversion center. The imidazole and benzene rings make a dihedral angle of 73.1?(9)°. In the crystal, non-classical inter-molecular C-H?Br hydrogen bonds link the ion pairs into a two-dimensional network.
Project description:In the title hydrated mol-ecular salt, C(6)H(16)N(2) (2+)·2Br(-)·2H(2)O, the complete 1,4-dimethyl-piperazine-1,4-diium dication is generated by crystallographic inversion symmetry and both exocyclic C-N bonds are in equatorial orientations. In the crystal, the components are linked by N-H?O and O-H?Br hydrogen bonds, generating chains propagating in .
Project description:The title compound, C16H20N2 2+·2Br-·H2O (1) is a member of the class of compounds called viologens. Viologens are quaternary salts of di-pyridyls and are especially useful as redox indicators as a result of their large negative one-electron reduction potentials. Compound 1 consists of a dication composed of a pair of 4-methyl-pyridine rings mutually joined at the 2-position, with a dihedral angle between the pyridine rings of 62.35?(4)°. In addition, the rings are tethered via the pyridine nitro-gen atoms by a tetra-methyl-ene bridge. Charge balance is provided by a pair of bromide anions, which are hydrogen bonded to a single water mol-ecule [D O?Br = 3.3670?(15) and 3.3856?(15)?Å]. The crystal structure of 1, details of an improved synthesis, and a full analysis of its NMR spectra are presented.
Project description:In the crystal structure of the title compound, C(9)H(14)N(4) (2+)·2Br(-), the cation and anions have crystallographic mirror symmetry, with the mirror plane running through the central CH(2) group for the cation. The latter are stacked along the a axis, forming channels hosting the bromide anions. The crystal packing is stabilized by C-H?Br hydrogen-bonding inter-actions, generating a two-dimensional network.
Project description:The title compound, C(15)H(30)N(2) (2+)·2Br(-)·H(2)O, was synthesized by reaction of 4-piperidino-piperidine with dibromo-pentane. The dication is built up from three linked piperidine rings, two of which have one quaternary N atom in common (azoniaspiro), whereas the third is N-C bonded to the azoniaspiro system and protonated on the N atom (piperidinium). All three piperidine rings adopt chair conformations. The crystal structure features O-H?Br and N-H?Br hydrogen bonds.
Project description:In the title hydrated mol-ecular salt, C(38)H(52)N(4) (2+)·2Br(-)·H(2)O, the central benzene ring of the dication makes dihedral angles of 89.47?(13) and 72.69?(12)° with the pendant benzimidazol-3-ium rings. The conformations of the octyl side chains are completely different. In the crystal, the components are linked by O-H?Br, C-H?Br and C-H?O hydrogen bonds into a two-dimensional network lying parallel to the ac plane. Aromatic ?-? stacking inter-actions are also observed [shortest centroid-to-centroid separation = 3.5047?(16)?Å].
Project description:The alkyl-ammonium chain of the dication in the title mitochondrially targeted (5-ammonio-pent-yl)triphenyl--phos-pho-nium dibromide ethanol solvate, C(23)H(28)NP(2+)·2Br(-)·C(2)H(6)O, is almost planar (r.m.s deviation = 0.0716?Å for all non-H atoms) and in the extended form, maximizing the P?N distance [7.716?(2)?Å]. The ions and solvent are linked within the crystal by N-H?Br, N-H?O and O-H?Br hydrogen-bonding inter-actions, forming C(3) (2)(6) chains along the b axis, with secondary C-H?Br and C-H?O inter-actions cross-linking the chains.
Project description:In the title compound, C(14)H(30)N(2) (2+)·2Br(-)·2CH(3)OH, two terminal C atoms of the butane chain are connected to two N atoms of the 1-methyl-pyrollidines, forming a linear diquaternary ammonium cation. The cation lies across a centre of inversion located between the two central C atoms of the butane chain. The asymmetric unit therefore comprises one half-cation, a bromide anion and a methanol solvent mol-ecule. In the crystal structure, the bromide anions are linked to the methanol solvent mol-ecules by O-H?Br hydrogen bonds.