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The asymmetric unit of the title compound, C13H10F2N2O, contains one and a half N,N′-bis­(4-fluoro­phen­yl)urea mol­ecules. One of the mol­ecules has crystallographic twofold rotation symmetry. The benzene rings are twisted from each other by dihedral angles of 29.69 (6)° for the mol­ecule in a general position and 89.83 (6)° for the symmetry-generated mol­ecule. In the crystal structure, a pair of inter­molecular N—H...O hydrogen bonds link symmetry-related mol­ecules into chains along the b axis, forming R21(6) ring motifs.

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In the title compound, C6H10N2O, the 2,3-dihydro-1H-pyrazole ring is approximately planar, with a maximum deviation of 0.013 (1) Å. Pairs of inter­molecular N—H...O hydrogen bonds link neighboring mol­ecules into dimers, generating R22(8) ring motifs. These dimers are further linked into two-dimensional arrays parallel to the bc plane by inter­molecular N—H...O hydrogen bonds. The crystal structure is further stabilized by C—H...π inter­actions.

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In the title compound, C14H18N2O3S, the 1H-pyrazole ring is approximately planar, with a maximum deviation of 0.005 (1) Å. The dihedral angle formed between the 1H-pyrazole and phenyl rings is 79.09 (5)°. Pairs of inter­molecular N—H...O and O...H...N hydrogen bonds form dimers between neighboring mol­ecules, generating R22(10) ring motifs. These dimers are further linked by intermolecular N—H...O and O—H...N hydrogen bonds into two-dimensional arrays parallel to the ac plane. The crystal structure is also stabilized by C—H...π inter­actions.
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