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In the title compound, C8H7F3N2O, the OH and NH2 substituents adopt a Z configuration with respect to the C=N bond. The hydroxyimidamide unit is almost planar (r.m.s. deviation = 0.007 Å) and subtends an angle of 26.25 (13)° with the benzene ring. The F atoms of the trifluoromethyl substituent are disordered over two sets of sites with an occupancy ratio of 0.783 (15):0.217 (15). In the crystal, O—H...N hydrogen bonds form centrosymmetric dimers. Additional N—H...O hydrogen bonds link the dimers into zigzag chains along the b axis. Weak intermolecular F...F contacts of 2.714 (5) Å are also observed.