5,8-dimethoxynaphthalene-1,6-dicarboxylic acid.

The title compound, C14H12O6, crystallized in the centrosymmetric space group Pbca but does not exhibit hydrogen bonding of the usual cyclic dimer type about a center of symmetry or otherwise. Each molecule is linked to six neighbors by eight hydrogen bonds, which leads, in this structure, to a rich pattern of chains. Of the nine patterns of chains described, six propagate along the a direction, while three propagate along the c direction. The Odonor...Oacceptor distances in these hydrogen bonds are 2.683 (2), 2.706 (2), 3.011 (2) and 3.218 (3) A. In addition, each C-H group in the molecule is involved in one or more significantly attractive C-H...O interactions, while every O atom is involved in two or more. The two carboxylic H atoms are ordered, as are the carboxylic O atoms.

Citation

R E Gerkin. 5,8-dimethoxynaphthalene-1,6-dicarboxylic acid. Acta crystallographica. Section C, Crystal structure communications. 1997 Dec 15;53 ( Pt 12):1987-9

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PMID: 9431661

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