Crystal structures of the solvent-free and ethanol disolvate forms of 4,4'-(diazenediyl)bis(2,3,5,6-tetrafluorobenzoic acid) exemplifying self-stabilized azo-benzene cis-configurations.

ABSTRACT: cis-4,4'-(Diazenediyl)bis(2,3,5,6-tetrafluorobenzoic acid), C₁₄H₂F₈N₂O₄, and its ethanol disolvate, C₁₄H₂F₈N₂O₄·2C₂H₅OH, represent new examples of self-stabilized cis-configured azo-benzenes obtained by a common crystallization procedure at room temperature under normal laboratory lighting conditions. The target structure constitutes of two 2,3,5,6-tetra-fluoro-benzoic acid residues linked to each other by a cis-configured azo group and was confirmed for two isolated specimens extracted from the same sample, corresponding to a solvent-free form and an ethanol disolvate. In the solvent-free form, the mol-ecule is characterized by rotational

SUBMITTER: Elkin I 

PROVIDER: S-EPMC6176431 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature