In the title compound, C(8)H(6)N(2)O(2), the nitro group is rotated by 23.2 (3)° out of the plane of the benzene ring. The crystal structure is stabilized by van der Waals inter-actions.

In the title mol-ecule, C(7)H(7)NO(3), the nitro group is oriented at 14.4 (3)° with respect to the plane of the benzene ring. The crystal structure is stabilized by O-H⋯O hydrogen bonds and further consolidated by C-H⋯O inter-actions.

In the crystal of the title compound, C(9)H(10)N(2)O(2), the mol-ecules are linked by N-H⋯O hydrogen bonds, generating S(4) chains propagating in [010].

The asymmetric unit of the title compound, C(8)H(6)N(2)O(2), contains two independent mol-ecules, the aromatic rings of which are oriented at a dihedral angle of 1.68 (3)°. Intra-molecular C-H⋯O hydrogen bonds result in the formation of two non-planar six-membered rings, which adopt envelope and twisted conformations. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-e...

In the crystal structure of the title compound, C(8)H(7)NO(3), mol-ecules are linked through weak inter-molecular C-H⋯O hydrogen bonding.

The title compound, C8H10N2S, was prepared by reaction of methyl-amine solution, KOH and phenyl-iso-thio-cyanate in ethanol. It adopts a syn-Me and anti-Ph conformation relative to the C=S double bond. The dihedral angle between the N-C(=S)-N thio-urea and phenyl planes is 67.83 (6)°. In the crystal, the mol-ecules centrosymmetrical dimers by pairs of N(Ph)-H⋯S hydrogen bonds. The dimers are li...