organic compounds
Open access
The title compound, C5H8Cl2O2, represents a meso isomer crystallizing in a chiral space group with two molecules per asymmetric unit. The molecules form helical associates with a pitch of 6.31 Å along the a axis via O—HO hydrogen bonds. The overall three-dimesional supramolecular architecture is stabilized by C—ClO halogen bonding, with a ClO separation of 3.139 (3) Å and a C—ClO angle of 162.5 (2)°.
organic compounds
Open access
The title compound, C12H10N2O2, has a twisted conformation, with a dihedral angle between the planes of the pyridine and benzene rings of 78.4 (2)°. The nitro group is coplanar with the attached benzene ring within experimental error. The molecules form centrosymmetric dimers via Car—HO interactions (HO = 2.49 Å) and the dimers are π-stacked along the b axis [the separation between ring centroids is 3.788 (2) Å].