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The crystal structure of (±)-2,3-dihydro-3-oxo-1H-indeneacetic acid, C11H10O3, involves carboxyl-to-ketone hydrogen-bonding catemers [O...O 2.691 (2) Å] of an unusual type. Hydrogen bonds progress from the carboxyl H atom of one molecule to the ketone O (O1) atom of a glide-related enantiomer, resulting in heterochiral chains. Parallel screw-related hydrogen-bonding chains proceed in counter-directional pairs through the cell. Two different close contacts (2.49 and 2.58 Å) are found between the carboxyl C=O group and H atoms on neighboring molecules.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks I, global

fcf

Structure factor file (CIF format)
Contains datablock indac

CCDC reference: 130082

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