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Ammonium 2-amino-pyrazine-3-carboxyl-ate.

ABSTRACT: The title compound NH(4) (+)·C(5)H(4)N(3)O(2) (-) crystallizes with two formula units in the asymmetric unit. In each anion, the carboxyl-ate is deprotonated and the planar amino group [angle sums of 359 (3) and 355 (3)° at N] remains protonated. In the crystal, the cations and anions are bridged by N-H⋯O and N-H⋯N hydrogen bonds, forming a three-dimensional network.

SUBMITTER: Lutz M

PROVIDER: S-EPMC3099982 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Methyl pyrazine-2-carboxyl-ate.

Project description:The title compound, C(6)H(6)N(2)O(2), is approximately planar [r.m.s. deviation = 0.0488?(3)?Å]. In the crystal, weak inter-molecular C-H?O and C-H?N inter-actions join the mol-ecules into an infinite three-dimensional network.

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Project description:The title ion pair, C(13)H(10)N(+)·C(6)H(3)N(2)O(4) (-), contains a protonated acridine cation and a 3-carb-oxy-pyrazine-2-carboxyl-ate monoanion, which are linked together through O-H⋯O, N-H⋯O and weak C-H⋯O hydrogen bonds. These hydrogen bonds generate a C(10) chain graph-set motif. The crystal structure is further stabilized by extensive π-π stacking inter-actions between nearly parallel [dihedral angle = 1.21(2)°] acridine systems. The shortest distance between the centroids of the six-membered rings within the cations is 3.6315 (8) Å. In addition, C-H⋯π edge-to-face inter-actions are present.

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