Project description:In the crystal structure of the title compound, C(4)H(13)N(5) (2+)·2NO(3) (-), the main inter-molecular inter-actions are the N-H?O hydrogen bonds between the cationic amino groups and the O atoms of the nitrate ions. All amino H atoms and nitrate O atoms are involved in the three-dimensional hydrogen-bond network. There are two graph-set motifs R(2) (2)(8), which include the amino groups connected to the N atoms in the biguanide 3-, 4- and 5-positions, and the O atoms of a nitrate ion. They are extended along the a axis. An O atom of the second nitrate ion is involved in a graph-set motif C(4) that is a part of a helix-like N-H?O?H-N-H?O? chain oriented along the b axis. There are also two weak C-H?O inter-actions in the crystal structure.
Project description:In the title compound, C(12)H(14)N(2) (2+)·2I(3) (-), the 1,1'-dimethyl-4,4'-bipyridinium (DMBP) dication is charge balanced by two triiodide ions. The DMBP dication is planar within 0.010 (5) Å. The asymmetric unit contains only half of the dication, the other half being generated by an inversion center. Weak C-H⋯I inter-actions link the ions into sheets parallel to (121).
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.
Project description:The title compound, C(10)H(16)Br(2)N(4), was synthesized by the reaction of 1-methyl-imidazole and 1,2-dibromo-ethane in toluene. The complete dication is generated by a crystallographic inversion centre situated at the mid-point of the ethane C-C bond. In the crystal structure, weak inter-molecular C-H?Br inter-actions link the mol-ecules into chains along the b axis and an intramolecular C-H?Br close contact is also present.
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 two naphthyl fused-ring systems in the title compound, C(22)H(26)O(6), are aligned at 86.7 (1)°. Weak inter-molecular C-H⋯O hydrogen bonding is present in the crystal structure.
Project description:The title compound, C(11)H(15)N(5)O, crystallizes with two independent mol-ecules in the asymmetric unit, both of which contain essentially planar imidazole and pyrimidine rings [maximum deviations = 0.002 (2) and 0.026 (2) Å, respectively, for the first mol-ecule, and 0.001 (2) and 0.025 (2) Å for the second]; the dihedral angles between the rings are 2.1 (2) and 1.7 (2)° in the two mol-ecules. The crystal structure is stabilized by inter-molecular N-H⋯N hydrogen bonds, defining chains along a, which are further linked by weak inter-molecular π-π contacts [centroid centroid distance = 3.7989 (16) Å] into planes parallel to (01).
Project description:The asymmetric unit of the title compound, [Fe(C11H19Si)2], consists of one half of a ferrocene derivative. The Fe(II) atom lies on a twofold rotation axis, giving an eclipsed conformation for the cyclo-penta-dienyl ligands. No significant inter-molecular inter-actions are observed in the crystal structure.
Project description:In the title salt, C(23)H(26)N(4) (2+)·2C(6)H(2)N(3)O(7) (-), the dihedral angle between the imidazolium rings in the dication is 69.9 (1)°. The aromatic ring of the benzyl group is almost perpendicular to the N-heterocyclic ring that is directly connected to it [dihedral angles = 83.2 (2) and 77.3 (3)°].
Project description:In the title compound, C(12)H(14)N(2) (2+)·2BF(4) (-), the cation has a centre of symmetry at the mid-point of the central C-C bond. π-π inter-actions, with a shortest atom-to-atom distance of 3.757 (4) Å, extend the crystal structure into a one-dimensional supra-molecular chain.