Research Article: 4-Amino-2-hy­droxy­benzohydrazide

Date Published: July 01, 2012

Publisher: International Union of Crystallography

Author(s): Hadi Kargar, Reza Kia, Muhammad Nawaz Tahir.


The asymmetric unit of the title compound, C7H9N3O2, comprises two crystallographically independent mol­ecules (A and B). In each mol­ecule there is an intra­molecular O—H⋯O hydrogen bond making an S(6) ring motif. In the crystal, a pair of N—H⋯N hydrogen bonds link the two mol­ecules (A and B) into a dimer with an R22(6) ring motif. The B mol­ecules are linked via pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R22(10) ring motif. The mol­ecules are further linked via other N—H⋯O hydrogen bonds, forming undulating two-dimensional networks lying parallel to the bc plane. These networks are finally linked via N—H⋯O hydrogen bonds, forming a three-dimensional structure.

Partial Text

For background to Schiff bases derived from benzohydrazide, see: Xu (2012 ▶); Bakir & Green (2002 ▶). For hydrogen-bond motifs, see: Bernstein et al. (1995 ▶). For standard bond lengths, see: Allen et al. (1987 ▶).




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