Journal of Molecular Structure p. 53 - 63 (1997)
Update date:2022-08-03
Topics:
Oszust
Talik
Pietraszko
Marchewka
Baran
The X-ray structure of 2-amino-4-nitropyridine was determined at room temperature. The crystal belongs to the P2(I)/c space group of the monoclinic system (Z = 4, a = 6.7290(10), b = 10.946(2), c = 9.060(2) A, β = 100.03(3) deg) and is built of layers parallel to the (102) crystallographic plane. The molecules in the layer are joined into centrosymmetric dimers by two N-H···N hydrogen bonds (N···N distance = 3.011(3) A), which form rings of C(i) symmetry. The other N-H bonds of the amino groups are involved in N-H···O hydrogen bonds with the oxygen atoms of the nitro groups (N···O distance = 3.054(3) A). These hydrogen bonds join the dimers into an infinite plane. The powder IR and Raman spectra (4000-80 cm-1) were measured for normal and deuterated crystals and are discussed with respect to the crystal structure. The N-H stretching vibrations behave as the stretching vibrations of two almost independent hydrogen bonds. Strong A(g)-A(u)-type splitting is observed for the stretching vibrations of the N-H···N type hydrogen bonds.
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