Acta Cryst. (2008). E64, o1741-o1742  [ doi:10.1107/S1600536808025269 ]

2-(7,8-Diphenyl-1H-imidazo[4,5-f]quinoxalin-2-yl)phenol methanol disolvate

H.-K. Fun, R. Kia and P. R. Raithby

Abstract: The title compound, C₂₇H₁₈N₄O·2CH₄O, is a unsymmetrically substituted quinoxaline. An intramolecular O-HN hydrogen bond involving the hydroxy and imino groups generates an S(6) ring motif. Intermolecular C-HO and N-HO hydrogen bonds form an R₂¹(7) ring motif involving a methanol O atom and two H atoms of the imidazole and benzene rings, respectively. The latter links neighbouring molecules into one-dimensional extended chains along the a axis. The two benzene rings are inclined towards each other, as indicated by the dihedral angle of 52.13 (10)°. The phenol ring is almost coplanar with the basic quinoxaline unit, making a dihedral angle of 2.43 (6)°. The short distances between the centroids of the five- and six-membered rings prove the existence of - interactions [centroid-centroid distances = 3.5234 (9)-3.7885 (10) Å]. The crystal structure is stabilized by intramolecular O-HN, intermolecular O-HO, N-HO and C-HO (× 2) hydrogen bonds and weak intermolecular C-H and - interactions.

Online 13 August 2008

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