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4-[2-(Hydrogen phosphonato)-2-hydroxy-2-phosphonoethyl]pyridinium.

ABSTRACT: The title compound, C(7)H(11)NO(7)P(2), exists as a zwitterion in which the positive charge resides on the protonated pyridyl N atom and the negative charge on one of the two phosphate groups. In the crystal, adjacent molcules are linked by O-H⋯O and N-H⋯O hydrogen bonds into a three-dimensional network.

SUBMITTER: Wang FL

PROVIDER: S-EPMC3099945 | biostudies-literature |

REPOSITORIES: biostudies-literature

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4-Hydroxy-pyridinium hydrogen sulfate.

Project description:The crystal structure of the title salt, C(5)H(6)NO(+)·HSO(4) (-), consists of planar(r.m.s. deviation = 0.001 Å) 4-hydroxy-pyridinium cations and hydrogen sulfate anions which are hydrogen bonded into a layer motif. In the anion, the S-O bond [1.551 (2) Å] involving the O atom bearing the acid H atom is longer than the other three S-O bonds, which range from 1.437 (1) to 1.454 (1) Å.

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Tris(4-hydroxy-pyridinium) hydrogen sulfate-sulfate monohydrate.

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Project description:In the title salt hydrate, C(5)H(6)NO(+)·C(6)HCl(2)O(4) (-)·H(2)O, the three components are held together by O-H?O and N-H?O hydrogen bonds, as well as by C-H?O contacts, forming a double-tape structure along the c axis. Within each tape, the pyridinium ring and the chloranilate ring are almost coplanar, forming a dihedral angle of 2.35?(7)°.

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Bis(3-hydroxy-pyridinium) fumarate.

Project description:The crystal structure of the title compound, 2C(5)H(6)NO(2) (+)·C(4)H(2)O(4) (2-), consists of 3-hydroxy-pyridinium cations and fumarate dianions. The dianion is located on an inversion center and the cation is linked to it by O-H?O and N-H?O hydrogen bonds. The cation is twisted with respect to the anion by 24.83?(5)°.

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2-(Hydroxy-meth-yl)pyridinium chloride.

Project description:In the title molecular salt, C(6)H(8)NO(+)·Cl(-), the packing is consolidated by N-H?Cl and O-H?Cl hydrogen bonds, resulting in the formation of [010] chains of alternating cations and anions.

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Project description:In the title compound, C(5)H(7)N(2) (+)·C(7)H(5)O(3) (-), the carboxyl-ate mean plane of the 4-hydroxy-benzoate anion is twisted by 8.78?(5)° from the attached ring. The cations and anions are linked via O-H?O, N-H?O and C-H?O hydrogen bonds, forming a three-dimensional network. In addition, ?-? inter-actions involving the benzene and pyridinium rings, with centroid-centroid distances of 3.5500?(6) and 3.6594?(6)?Å, are observed.

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3,4-Diamino-pyridinium hydrogen succinate.

Project description:In the title compound, C(5)H(8)N(3) (+)·C(4)H(5)O(4) (-), the pyridine N atom of the 3,4-diamino-pyridine mol-ecule is protonated. The protonated N atom participates in an N-H?O hydrogen bond to a succinate O atom of the singly deprotonated succinate anion. Each of the two amino groups are hydrogen-bonded to the O atoms of two different sets of succinate groups.. The crystal structure is further stabilized by O-H?O and C-H?O hydrogen bonds.

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