Crystal structure of 1,2-bis-(4-fluoro-phen-yl)-1-hy-droxy-2,3,8-tri-meth-oxy-acenaphthene: formation of a five-membered intra-molecular O-H⋯O hydrogen-bonded ring.

The structure of the title compound, CHFO, at 193 K has triclinic ( ) symmetry. The hy-droxy and meth-oxy groups at the 1,2-positions of the acenaphthene core display a configuration. Both substituents are involved in the formation of a five-membered intra-molecular O-H⋯O hydrogen-bonded ring. The 4-fluoro-phenyl rings make dihedral angles of 87.02 (7) and 51.86 (8)° with the naphthalene ring system. In the crystal, a pair of non-classical C-H⋯O hydrogen bonds forms centrosymmetric dimeric structures. The dimeric aggregates are linked in the plane through non-classical C-H⋯F hydrogen bonds and C-H⋯π interactions.