1-(2,4-Difluorophenyl)-2-(1H-1,2,4-triazol-1-yl)ethanol

In the title compound, C10H9F2N3O, the dihedral angle between the mean planes of the triazole and benzene rings is 20.6 (2)°. In the crystal, molecules are linked by strong O—H⋯ N hydrogen bonds into chains with graph-set notation C(9) along [100]. Weak C—H⋯N and C—H⋯F interactions are also observed.

In the title compound, C 10 H 9 F 2 N 3 O, the dihedral angle between the mean planes of the triazole and benzene rings is 20.6 (2) . In the crystal, molecules are linked by strong O-HÁ Á Á N hydrogen bonds into chains with graph-set notation C(9) along [100]. Weak C-HÁ Á ÁN and C-HÁ Á ÁF interactions are also observed.
In the title molecule, Fig. 1, the dihedral angle between the mean planes of the triazole and benzene rings is 20.6 (2)°.
In the crystal, molecules are linked by strong O-H··· N hydrogen bonds ( Fig. 2 and Table 1) into chains propagating along [100] which have a C(9) graph-set notation (Bernstein et al., 1995). There are also weak C-H···N and C-H···F interactions present (Table 1).
After evaporation of the solvent under vacuum, the residue was purified by crystallization in ethanol to provide the title compound as colourless crystals [85% yield; M.p.: 391-393 K].

Refinement
All of the H atoms could be located in difference Fourier maps. In the final cycles of refinement they were included in calculated positions and treated as riding atoms: O-H = 0.82 Å, C-H = 0.93 and 0.97 Å for CH and CH 2 H atoms, respectively, with U iso (H) = k × U eq (O,C), where k = 1.5 for the OH H atom, and = 1.2 for other H atoms. In the final cycles of refinement, in the absence of significant anomalous scattering effects, 1126 Friedel pairs were merged and Δf " set to zero.

Special details
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell esds are taken into account in the estimation of distances, angles and torsion angles Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.