Abstract
The title compound, C8H4Br2O4·C2H6O2, crystallizes with one-half of a 2,5-di-bromo-terephthalic acid (H2Br2tp) mol-ecule and one-half of an ethyl-ene glycol (EG) mol-ecule in the the asymmetric unit. The whole mol-ecules are generated by application of inversion symmetry. The H2Br2tp mol-ecule is not planar, with the di-bromo-benzene ring system inclined by a dihedral angle of 18.62 (3)° to the carb-oxy-lic group. In the crystal, the H2Br2tp and EG mol-ecules are linked into sheets propagating parallel to (01) through O-H⋯O hydrogen bonds, thereby forming R 4 4 (12) and R 4 4 (28) graph-set motifs. Br⋯O and weak π-π stacking inter-actions are also observed. Hirshfeld surface analysis was used to confirm the existence of these inter-actions.
Highlights
Terephthalic acid and its derivatives are important ligands in the construction of coordination frameworks with high dimensionalities and interesting topologies (Li et al, 1999; Seidel et al, 2011)
We present the crystal structure of 2,5-dibromoterephthalic acid ethylene glycol monosolvate, C8H4Br2O4ÁC2H6O2 or H2Br2tpÁEG, which is a pseudopolymorph of the previously reported compound 2,5-dibromoterephthalic acid dihydrate (Song et al, 2008)
As a result of symmetry restrictions, the EG molecule adopts an anti-conformation with an O3—C5—C5i—O3i torsion angle of 180 [symmetry code: (i)
Summary
Terephthalic acid and its derivatives are important ligands in the construction of coordination frameworks with high dimensionalities and interesting topologies (Li et al, 1999; Seidel et al, 2011). They have been shown to be versatile building blocks in crystal engineering to drive the selfassembly of functional supramolecular networks through intermolecular interactions such as hydrogen bonds, halogen bonds, and aromatic – stacking interactions (Lemmerer, 2011; Karmakar et al, 2014; Meng et al, 2015). We present the crystal structure of 2,5-dibromoterephthalic acid ethylene glycol monosolvate, C8H4Br2O4ÁC2H6O2 or H2Br2tpÁEG, which is a pseudopolymorph of the previously reported compound 2,5-dibromoterephthalic acid dihydrate (Song et al, 2008)
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