title: 2,2'-(Disulfanedi-yl)dibenzoic acid-2,9-dimethyl-phenanthroline-tetra-hydro-furan (1/2/1).
abstract: The asymmetric unit of the title co-crystal solvate, C(14)H(10)O(4)S(2)·2C(14)H(12)N(2)·C(4)H(8)O, comprises a 2,2'-(disulfanedi-yl)dibenzoic acid mol-ecule, two mol-ecules of 2,9-dimethyl-phenanthroline and a tetra-hydro-furan (THF) solvent mol-ecule. Each end of the twisted diacid [dihedral angle between the benzene rings = 74.33 (17)°] forms a strong O-H⋯N hydrogen bond with a 2,9-dimethyl-phenanthroline mol-ecule, forming a trimeric aggregate. The crystal structure comprises layers of acid and THF mol-ecules, and layers of 2,9-dimethyl-phenanthroline mol-ecules that alternate along the a axis, the main connections between them being of the type C-H⋯O.
authors.forename: Hadi D
authors.initials: HD
authors.lastname: Arman
authors.forename: Trupta
authors.initials: T
authors.lastname: Kaulgud
authors.forename: Edward R T
authors.initials: ER
authors.lastname: Tiekink