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2-Amino-3-carb-oxy-pyridinium nitrate.

ABSTRACT: In the crystal structure of the title compound, C(6)H(7)N(2)O(2) (+)·NO(3) (-), the cations are linked via C-H?O hydrogen bonds, forming infinite chains running along the b axis. These chains are further linked through N-H?O, O-H?O and C-H?O hydrogen bonds to the nitrate anions, forming well-separated infinite planar layers parallel to (001).

SUBMITTER: Berrah F

PROVIDER: S-EPMC3213504 | biostudies-literature | 2011 Aug

REPOSITORIES: biostudies-literature

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2-Amino-3-carb-oxy-pyridinium nitrate.

Berrah Fadila F Bouacida Sofiane S Roisnel Thierry T

Acta crystallographica. Section E, Structure reports online 20110716 Pt 8

In the crystal structure of the title compound, C(6)H(7)N(2)O(2) (+)·NO(3) (-), the cations are linked via C-H⋯O hydrogen bonds, forming infinite chains running along the b axis. These chains are further linked through N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds to the nitrate anions, forming well-separated infinite planar layers parallel to (001). ...[more]

PMID: 22091083

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3-Carb-oxy-pyridinium nitrate.

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4-Amino-pyridinium 4-carb-oxy-butano-ate.

Project description:The asymmetric unit of the title salt, C(5)H(7)N(2) (+)·C(5)H(7)O(4) (-), contains two 4-amino-pyridinium cations and two 4-carb-oxy-butano-ate anions. Each 4-amino-pyridinium cation is planar, with a maximum deviation of 0.005?(2)?Å. Both 4-carb-oxy-butano-ate anions adopt an extended conformation. In the crystal structure, the cations and anions are linked via N-H?O, O-H?O and C-H?O hydrogen bonds, forming a two-dimensional network parallel to the bc plane.

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2-Amino-3-carb-oxy-pyridinium chloride hemihydrate.

Project description:The asymmetric unit of the title compound, C(6)H(7)N(2)O(2) (+)·Cl(-)·0.5H(2)O, consists of two protonated 2-amino-3-carb-oxy-pyridine cations, two chloride anions and one mol-ecule of water. The crystal packing can be described as alternating layers of cations and anions parallel to (110), which are linked together by O(w)-H?Cl inter-actions. In the crystal, four types of classical hydrogen bonds are observed, viz. cation-anion (O-H?Cl and N-H?Cl), cation-cation (N-H?O), cation-water (N-H?O(w)) and water-anion (O(w)-H?Cl), resulting in the formation of an infinite three-dimensional network.

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Project description:In the title salt, C(6)H(9)N(2) (+)·C(8)H(5)O(4) (-), the hydrogen phthalate anion is essentially planar, with a maximum deviation of 0.011?(2)?Å. In the crystal structure, the protonated N atom of the pyridine ring and the 2-amino group of the cation are hydrogen bonded to the carboxyl-ate O atoms of the anion via a pair of N-H?O hydrogen bonds, forming an R(2) (2)(8) ring motif. In the hydrogen phthalate anion, there is a very strong, almost symmetric, intra-molecular O-H?O hydrogen bond, generating an S(7) motif [O?O = 2.382?(3)?Å]. Furthermore, these two molecular motif rings are connected by a bifurcated N-H?(O,O) hydrogen-bonded motif R(1) (2)(4), forming a supra-molecular ribbon along the b axis. The crystal structure is further stabilized by ?-? inter-actions between the cations and anions [centroid-centroid distance = 3.6999?(10)?Å].

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2-Amino-5-bromo-pyridinium 2-carb-oxy-benzoate.

Project description:The asymmetric unit of the title compound, C(5)H(6)BrN(2) (+)·C(8)H(5)O(4) (-), consists of two crystallographically independent 2-amino-5-bromo-pyridinium cations (A and B) and two 2-carb-oxy-benzoate anions (A and B). Each 2-amino-5-bromo-pyridinium cation is approximately planar, with a maximum deviation of 0.047?(1)?Å in cation A and 0.027?(1)?Å in cation B. The 2-amino-5-bromo-pyridinium unit in cation A is inclined at dihedral angles of 4.9?(3) and 2.2?(3)° with the phenyl rings of the A and B 2-carb-oxy-benzoate anions, respectively. The corresponding angles for cation B are 3.0?(3) and 5.6?(3)°. The mol-ecular structure is stabilized by an intra-molecular O-H?O hydrogen bond,which generates an S(7) ring motif. The cations and anions are linked via inter-molecular N-H?O and C-H?O hydrogen bonds, generating R(2) (2)(8) ring motifs. In the crystal packing, mol-ecules are linked into wave-like chains along [001] via adjacent ring motifs. Short inter-molecular distances between the phenyl and pyridine rings [3.613?(4) and 3.641?(4)?Å] indicate the existence of ?-? inter-actions. The crystal structure is a non-merohedral twin with a contribution of 0.271?(3) of the minor component.

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2-Amino-4-methyl-pyridinium 2-carb-oxy-benzoate.

Project description:In the title mol-ecular salt, C(6)H(9)N(2) (+)·C(8)H(5)O(4) (-), the anion is stabilized by an intra-molecular O-H?O hydrogen bond, which generates an S(7) ring motif. In the crystal, the cations and anions are linked to form extended chains along [001] by O-H?O and N-H?O hydrogen bonds. Adjacent chains are crosslinked via C-H?O inter-actions into sheets lying parallel to (100).

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2-Amino-5-methyl-pyridinium 2-carb-oxy-acetate.

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2-Amino-5-chloro-pyridinium 2-carb-oxy-acetate.

Project description:The title salt, C(5)H(6)ClN(2) (+)·C(3)H(3)O(4) (-), contains two cations and two anions in the asymmetric unit. Both 2-amino-5-chloro-pyridinium ions are protonated at their pyridine N atoms and both hydrogen malonate ions feature an intra-molecular O-H?O hydrogen bond, which generates an S(6) ring motif and results in a folded conformation. In the crystal structure, the cations and anions are linked via N-H?O, O-H?O and C-H?O hydrogen bonds, forming chains propagating in [010], which are cross-linked by further C-H?O inter-actions.

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