A 1:2 co-crystal of 2,2′-dithiodibenzoic acid and benzoic acid: crystal structure, Hirshfeld surface analysis and computational study
The asymmetric unit of the title 1:2 co-crystal, C14H10O4S2-2C7H6O2, comprises half a molecule of dithiodibenzoic acid [systematic name: 2-[(2-carboxyphenyl)disulfanyl]benzoic acid, DTBA], as the molecule is located about a twofold axis of symmetry, and a molecule of benzoic acid (BA). The DTBA mole...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
International Union of Crystallography
2019
|
| Subjects: | |
| Online Access: | http://eprints.sunway.edu.my/955/ http://eprints.sunway.edu.my/955/1/Tiekink%20A%201%202%20co%20crystal%20Acta%20Cryst%20%282019%29%2075%201.pdf |
| Summary: | The asymmetric unit of the title 1:2 co-crystal, C14H10O4S2-2C7H6O2, comprises half a molecule of dithiodibenzoic acid [systematic name: 2-[(2-carboxyphenyl)disulfanyl]benzoic acid, DTBA], as the molecule is located about a twofold axis of symmetry, and a molecule of benzoic acid (BA). The DTBA molecule is twisted about the disulfide bond [the C—S—S—C torsion angle is -83.19 (8)⁰] resulting in a near perpendicular relationship between the benzene rings [dihedral angle = 71.19 (4)⁰]. The carboxylic acid group is almost co-planar with the benzene ring to which it is bonded [dihedral angle = 4.82 (12)⁰]. A similar near co-planar relationship pertains for the BA molecule [dihedral angle = 3.65 (15)⁰]. Three-molecule aggregates are formed in the crystal whereby two BA molecules are connected to a DTBA molecule via hydroxyO—H...O(hydroxy) hydrogen bonds and eight-membered {...HOC=O}2 synthons. These are connected into a supramolecular layer in the ab plane through C—H...O interactions. The interactions between layers to consolidate the three-dimensional architecture are π–π stacking interactions between DTBA and BA rings [inter-centroid separation = 3.8093 (10) A ˚ ] and parallel DTBA-hydroxy-O...π(BA) contacts [O...ring centroid separation = 3.9049 (14) A ˚ ]. The importance of the specified interactions as well as other weaker contacts, e.g. π–π and C—H...S, are indicated in the analysis of the calculated Hirshfeld surface and interaction energies. |
|---|