Molecules of the title compound, C(6)H(7)N(3)O(2 .)2H(2)O are almost planar with the NNO2 nitrimino group twisted 8(1)degrees out of the plane of the pyridine ring. The nitrimino group and C5N ring form a conjugated pi-electron system. These molecules together with water molecules are arranged in planes. They are connected with each other by O-H ... O, O-H ... N and weaker C-H ... O hydrogen bonds. Four water molecules form a planar square (O-H ... O-H)(2) ring with O ... O distances equal to 2.741(2) and 2.778(2)Angstrom. These rings join pairs of molecular planes into double layers, interacting otherwise by van der Waals forces.
1-Methyl-4-nitraminopyridinium nitrate and 4-nitraminopyridinium methanesulfonate
作者:Jacek Zaleski、Zdzisław Daszkiewicz、Janusz B. Kyzioł
DOI:10.1107/s0108270101004784
日期:2001.6.15
In the title compounds, C6H8N3O2+. NO3- and C5H6N3O2+. (-) H3SO3- , respectively, the cations are almost planar; the twist of the nitramino group about the C-N and N-N bonds does not exceed 10 degrees. The deviations from coplanarity are accounted for by intermolecular N-H . . . O interactions. The coplanarity of the NHNO2 group and the phenyl ring leads to the deformation of the nitramino group. The C-N-N angle and one C-C-N angle at the junction of the phenyl ring and the nitramino group are increased from 120 degrees by ca 6 degrees, whereas the other junction C-C-N angle is decreased by ca 5 degrees. Within the nitro group, the O-N-O angle is increased by ca 5 degrees and one O-N-N angle is decreased by ca 5 degrees, whereas the other O-N-N angle remains almost unchanged. The cations are connected to the anions by relatively strong N-H . . . O hydrogen bonds [shortest H . . .O separations 1.77 (2)-1.81 (3) Angstrom] and much weaker C-H . . . O hydrogen bonds [H . . . O separations 2.30 (2)-2.63 (3) Angstrom].