Two furan-2,5-dicarboxylic acid solvates crystallized from dimethylformamide and dimethyl sulfoxide

Furan-2,5-dicarboxylic acid (FDCA) has been ranked among the top 12 bio-based building-block chemicals by the Department of Energy in the US. The molecule was first synthesized in 1876, but large-scale production has only become possible since the development of modern bio- and chemical catalysis techniques. The structures of two FDCA solvates, namely, FDCA dimethylformamide (DMF) disolvate, C₆H₄O₅·2C₃H₇NO, (I), and FDCA dimethyl sulfoxide (DMSO) monosolvate, C₆H₄O₅·C₂H₆OS, (II), are reported. Solvate (I) crystallizes in the orthorhombic Pbcn space group and solvate (II) crystallizes in the monoclinic P-1 space group. In (I), hydrogen bonds form between the carbonyl O atom in DMF and a hydroxy H atom in FDCA. Whilst in (II), the O atom in one DMSO molecule hydrogen bonds with hydroxy H atoms in two FDCA molecules. Combined with intermolecular S...O interactions, FDCA molecules form a two-dimensional network coordinated by DMSO.