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In 5,8-dimethoxy-1-naphthoic acid, C13H12O4, hydrogen bonding is of the cyclic dimer type. The acid H atom is modelled as being distributed equally over two sites. In addition to the conventional hydrogen bonds there are three significantly attractive C—H...O interactions. The dihedral angle between the naphthalene core plane and the carboxyl plane is 80.0 (1)°. In methyl 5,8-dimethoxy-1-naphthoate, C14H14O4, there are no conventional hydrogen bonds but there are three significantly attractive C—H...O interactions. With the exception of the C-O distances in the carboxyl groups, the molecular geometries of the acid and the ester are quite similar.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, I, II

hkl

Structure factor file (CIF format)
Contains datablock I

hkl

Structure factor file (CIF format)
Contains datablock II

CCDC references: 128946; 128947

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