Coumarin-3-carboxylic acid: a second P2(1)/c modification

Hazel A. Sparkes*, Judith A. K. Howard

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

1 Citation (Scopus)


A second polymorph of coumarin-3-carboxylic acid (2-oxo-2H- 1-benzopyran-3-carboxylic acid), C10H6O4, is reported in the P2(1)/c space group. The structure shows intermolecular hydrogen bonding between the carboxyl groups on pairs of molecules related by an inversion centre, as well as a number of C-H center dot center dot center dot O contacts.

Original languageEnglish
Pages (from-to)O3894-U3799
Number of pages10
JournalActa Crystallographica Section E: Structure Reports Online
Publication statusPublished - Sept 2007


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