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4-Cyano-1-methyl-pyridinium iodide.

ABSTRACT: In the crystal structure of the title compound, C(7)H(7)N(2) (+)·I(-), the cations form inversion-related dimers via weak pairwise C-H⋯N hydrogen bonds. In the dimers, the pyridinium rings are parallel to one another with their mean planes separated by a normal distance of ca 0.28 Å. Weak C-H⋯N inter-actions between adjacent dimers generate a layer lying parallel to (10-1). The remaining H atoms form C-H⋯I inter-actions, which link the layers into a three-dimensional structure.

SUBMITTER: Kammer MN

PROVIDER: S-EPMC3414965 | biostudies-literature |

REPOSITORIES: biostudies-literature

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2-Cyano-1-methyl-pyridinium iodide.

Project description:The cation in the title compound, C7H7N2 (+)·I(-), is planar (r.m.s. deviation for the nine fitted non-H atoms = 0.040 Å). The crystal packing is best described as undulating layers of cations and anions associated via C-H⋯I inter-actions.

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2-Cyano-1-methyl-pyridinium nitrate.

Project description:In the title compound, C(7)H(7)N(2) (+)·NO(3) (-), all atoms except the methyl H atoms lie on a crystallographic mirror plane. The inter-layer distance, including that between aligned N atoms from alternating cations and anions in adjacent layers, is exceptionally short at 3.055?(1)?Å. Two-dimensional C-H?O hydrogen-bonded networks link cations to anions, while C-H?N inter-actions link cations within each layer. Anion-? inter-actions with the cations assist in binding the layers together.

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4-Cyano-1-methyl-pyridinium nitrate.

Project description:The title mol-ecular salt, C7H7N2 (+)·NO3 (-), displays an inter-penetrating sheet structure parallel to a with each sheet containing nearly coplanar cations and anions, each ion being bis-ected by a crystallographic mirror plane. C-H⋯O hydrogen bonds involving both ring and methyl H atoms in addition to cation-cation C-H⋯N hydrogen bonds (ring H to cyano N) serve to link the sheets together. In each set of parallel layers, the cations and anions stack with short distances of 3.094 (2) (between aligned nitrate N and pyridine N atoms) and 3.057 (2) Å (between a nitrate O atom and the ring centroid). This motif is strikingly similar to the one that features in the isomeric salt 2-cyano-1-methyl-pyridinium nitrate.

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4-Cyano-1-methyl-pyridinium perchlor-ate.

Project description:The title salt, C7H7N2 (+)·ClO4 (-), crystallizes with alternating cations and anions in wavy sheets, which are formed by a number of C-H?O and C-H?N hydrogen bonds, lying approximately parallel to (001).

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1-(4-Methyl-benzyl-ideneamino)pyridinium iodide.

Project description:The title compound, C(13)H(13)N(2) (+)·I(-), is a derivative of 1-amino-pyridinium iodide. The pyridine and benzene rings are oriented at a dihedral angle of 45.78 (3)°. In the crystal structure, weak inter-molecular C-H⋯I hydrogen bonds link the mol-ecules.

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Project description:The cation of the title compound, C(14)H(14)N(3) (+)·I(-), is non-planar, the dihedral angle between the benzimidazole and the 1-methyl-pyridinium planes being 37.4?(2)°. The crystal structure is stabilized by weak ?-? stacking inter-actions, the centroid-centroid distances between 1-methyl-imidazole and benzimidazole planes being 3.678?(4)?Å.

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Project description:In the crystal of the title mol-ecular salt, C(7)H(7)N(2) (+)·Br(-), the cations form inversion dimers via weak pairwise C-H?N hydrogen bonds; their mean planes are separated by 0.292?(6)?Å. Weak C-H?Br inter-actions involving all of the remaining H atoms tie the cations and anions together into sets of inter-penetrating sheets. The title compound is isostructural with its iodide analogue.

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1-(4-Cyano-benz-yl)-4-methyl-pyridinium bromide.

Project description:In the title compound, C(14)H(13)N(2) (+)·Br(-), the 1-(4-cyano-benz-yl)-4-methyl-pyridinium cation has a ?-shaped conformation, and the dihedral angle between the benzene and pyridinium rings is 75.8?(2)°. In the crystal, two cations form a dimer through ?-? inter-actions between pyridine rings [the centroid-centroid distance is 3.685?(1)?Å].

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Crystal structure of 2-cyano-1-methyl-pyridinium perchlorate.

Project description:The asymmetric unit of the title salt, C7H7N2 (+)·ClO4 (-), comprises two independent formula units. The solid-state structure comprises corrugated layers of cations and of anions, approximately parallel to (010). The supra-molecular layers are stabilized and connected by C-H?O hydrogen bonding to consolidate a three-dimensional architecture. A close pyridin-ium-perchlorate N?O contact [2.867?(5)?Å] is noted. The crystal was refined as an inversion twin.

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Crystal structure of 2-cyano-1-methyl-pyridinium bromide.

Project description:In the title mol-ecular salt, C7H7N2 (+)·Br(-), all the non-H atoms lie on crystallographic mirror planes. The packing consists of (010) cation-anion layers, with the cations forming dimeric units via very weak pairwise C-H?N inter-actions. Weak C-H?Br inter-actions link the cations to the anions.

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