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2-Amino-pyridin-1-ium triiodide.

ABSTRACT: The asymmetric unit of the title compound, C5H7N2 (+.)I3 (-), consists of one 2-amino-pyridin-1-ium cation (apyH(+)) and one triiodide anion, both located in general postions. The apyH(+) cation is planar within the experimental uncertainties. The short N-C distance [1.328?(5)?Å] of the exocyclic NH2 group is typical for the imino-form of protonated 2-amino-pyridines. Consequently, the bond lengths within the six-membered ring vary significantly. The geometric parameters of the triiodide anion are in the typical range, with bond lengths of 2.8966?(3) and 2.9389?(3)?Å and a bond angle of 176.02?(1)°. In the crystal, N-H ? I hydrogen bonds connect adjacent ions into screwed chains along the b-axis direction. These chains are twisted pairwise into rectangular rods. The pyridinium moieties of neighbouring rods are arranged parallel to each other with a plane-to-plane distance of 3.423?(5)?Å.

SUBMITTER: Reiss GJ 

PROVIDER: S-EPMC3772490 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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2-Amino-pyridin-1-ium triiodide.

Reiss Guido J GJ   Leske Peer B PB  

Acta crystallographica. Section E, Structure reports online 20130608 Pt 7

The asymmetric unit of the title compound, C5H7N2 (+.)I3 (-), consists of one 2-amino-pyridin-1-ium cation (apyH(+)) and one triiodide anion, both located in general postions. The apyH(+) cation is planar within the experimental uncertainties. The short N-C distance [1.328 (5) Å] of the exocyclic NH2 group is typical for the imino-form of protonated 2-amino-pyridines. Consequently, the bond lengths within the six-membered ring vary significantly. The geometric parameters of the triiodide anion a  ...[more]

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