2-Hy-droxy-benzenaminium acetate.

In the title molecular salt, C6H8NO+·C2H3O2 -, the cations and anions are linked by O-H⋯O and N-H⋯O hydrogen bonds, generating a three-dimensional network.

Crystal structure and Hirshfeld surface analysis of 2-(2-hy-droxy-phen-yl)quinoline-6-sulfonamide.

In the title compound, C15H12N2O3S, there are two mol-ecules (A and B) in the asymmetric unit. The attached phenol and quinoline moieties of each mol-ecule are almost coplanar with a dihedral angle of 6.05 (15)° for mol-ecule A and 1.89 (13)° for mol-ecule B. The crystal structure features N-H⋯O and C-H⋯O hydrogen bonds, C-H⋯π inter-actions and π-π stacking inter-actions. Hirshfeld surface analysis indicates that the most significant contacts in the crystal packing are C⋯H/H⋯C (29.2%), O⋯H/H⋯O (28.6%) and H⋯H (28.5%).

A new crystal form and anti-microbial activity of (E)-1-[3-(2-hy-droxy-benzyl-idene-amino)-phen-yl]ethanone.

The title Schiff base compound, C15H13NO2, crystallizes in a new crystal form in the space group P212121, which is different from the monoclinic P21/n space group reported previously [De et al. (2009 ▸). Indian J. Chem. Sect. B, 48, 595-598]. An intra-molecular O-H⋯N hydrogen bond occurs between the hy-droxy and azomethine moieties. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds into supra-molecular chains propagating along the b-axis direction with a C(8) graph-set motif. The contribution of these two contacts in Hirshfeld surface area are around 19 and 21%, respectively. The title compound was screened for its anti-bacterial activity against two gram-negative (Escherichia coli and Salmonella typhimurium) and one gram-positive (Staphyloccus aureus) bacteria. The results of this study reveal that this Schiff base shows good activity against only one bacterium, i.e. Salmonella typhimurium.

dl-Asparaginium nitrate.

In the title compound, C(4)H(9)N(2)O(3) (+)·NO(3) (-), alternatively called (1RS)-2-carbamoyl-1-carboxy-ethanaminium nitrate, the asymmetric unit comprises one asparaginium cation and one nitrate anion. The strongest cation-cation O-H⋯O hydrogen bond in the structure, together with other strong cation-cation N-H⋯O hydrogen bonds, generates a succession of infinite chains of R(2) (2)(8) rings along the b axis. Additional cation-cation C-H⋯O hydrogen bonds link these chains into two-dimensional layers formed by alternating R(4) (4)(24) and R(4) (2)(12) rings. Connections between these layers are provided by the strong cation-anion N-H⋯O hydrogen bonds, as well as by one weak C-H⋯O inter-action, thus forming a three-dimensional network. Some of the cation-anion N-H⋯O hydrogen bonds are bifurcated of the type D-H⋯(A(1),A(2)).