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4-Amino-3-ammonio-pyridinium dichloride.

ABSTRACT: The anions and cations of the title compound, C(5)H(9)N(3) (2+)·2Cl(-), are connected by two chloride-bridged three-centered N-H?Cl hydrogen bonds into a three-dimensional network. The aromatic rings are not involved in stacking inter-actions.

SUBMITTER: Qin JH

PROVIDER: S-EPMC2968050 | biostudies-literature | 2008 Dec

REPOSITORIES: biostudies-literature

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4-Amino-3-ammonio-pyridinium dichloride.

Qin Jian-Hua JH Wang Jian-Ge JG

Acta crystallographica. Section E, Structure reports online 20081217 Pt 1

The anions and cations of the title compound, C(5)H(9)N(3) (2+)·2Cl(-), are connected by two chloride-bridged three-centered N-H⋯Cl hydrogen bonds into a three-dimensional network. The aromatic rings are not involved in stacking inter-actions. ...[more]

PMID: 21581592

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2-Amino-3-ammonio-pyridinium dichloride.

Project description:The asymmetric unit of the title compound, C(5)H(9)N(3) (2+)·2Cl(-), contains two diprotonated 2,3-diamino-pyridine cations and four chloride anions. In the crystal structure, the anions and cations are connected by inter-molecular N-H?Cl and C-H?Cl hydrogen bonds, forming a three-dimensional network. The crystal structure is further stabilized by ?-? inter-actions between pyridinium rings [centroid-centroid distance = 3.695?(1)?Å].

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Project description:The title compound, C(6)H(10)N(2) (2+)·2Cl(-), contains a network of 4-(ammonio-meth-yl)pyridinium cations and chloride anions which are inter-connected by N-H?Cl hydrogen bonds. The crystal packing is also influenced by inter-molecular ?-? stacking inter-actions between identical anti-parallel organic cations with a face-to-face distance of ca 3.52?Å.

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Project description:The crystal structure of the title compound, C(6)H(10)N(2) (2+)·2Cl(-), has been reported previously in the non-standard setting P2(1)/a [Genet (1965 ?). Bull. Soc. Fr. Miner. Crist.88, 463-470], with an R value of 0.16. The current redetermination improves significantly the precision of the geometric parameters. In the crystal packing, cations and anions are linked by inter-molecular N-H?Cl and C-H?Cl hydrogen bonds into a three-dimensional network.

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Project description:In the crystal structure of the title compound, C(5)H(9)N(3) (2+)·2NO(3) (-), the cations and anions are connected by inter-molecular N-H?O and C-H?O hydrogen bonds, forming a three-dimensional network. The crystal structure is further stabilized by ??? inter-actions between pyridinium rings [centroid-centroid distance = 3.775?(4)?Å].

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Project description:The crystal structure of the title compound, C(7)H(11)N(3) (2+)·2Cl(-), has been determined as part of a project focusing on the ability of the benzamidine system to form strong hydrogen bonds in aqueous media. It is commonly used as a ligand in affinity chromatography for purification and immobilization of enzymes. A twofold rotation axis runs along the axis of the cation. The orientation of the amidinium group with respect to the benzene ring is indicated by the N-C-C-C torsion angle of 40.2?(1)°. In the crystal structure, cations and anions are linked via hydrogen bonds. The chloride anion is surrounded by four ammonium cations in a tetra-hedral environment. The aromatic rings of the amidinium cations are ?-stacked, with a centroid-centroid distance of 4.178?(1)?Å.

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3-(Ammonio-methyl)-pyridinium bis-(perchlorate).

Project description:In the title molecular salt, C6H10N2 (2+)·2ClO4 (-), the Cl-O bond lengths [anion 1: 1.369 (3)-1.415 (3); anion 2: 1.420 (2)-1.441 (2) Å] and the O-Cl-O angles [anion 1: 105.4 (2)-111.8 (4); anion 2: 107.8 (1)-110.3 (1)°] indicate a slight distortion of the perchlorate anions from regular tetra-hedral symmetry. In the crystal, the components are linked into columns along the a-axis direction via N-H⋯O and C-H⋯O hydrogen bonds, with stacks of the organic mol-ecules being surrounded by stacks of perchlorate anions.

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2-(Ammonio-meth-yl)pyridinium sulfate monohydrate.

Project description:In the crystal of the title hydrated molecular salt, C(6)H(10)N(2) (2+)·SO(4) (2-)·H(2)O, N-H⋯O and O-H⋯O hydrogen bonds link the mol-ecules into layers parallel to the ab plane. C-H⋯O hydrogen bonds are observed both within these layers and between mol-ecules and ions in adjacent layers.

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