Received 17 December 2012
In the title compound, C13H9NO6, the coumarin system has the benzene ring aligned at 0.61 (18)° with respect to the pyrone ring. An intramolecular O-HO hydrogen bond stabilizes the molecular conformation and a C-HO contact also occurs. In the crystal, weak C-HO interactions link the molecules, forming inversion dimers.
For the biological importance of flavinoids and coumarins, see: Murry et al. (1982); Andersen et al. (2006); Murakami et al. (2001); Wu et al. (2003). For their use as fluorescent probes and triplet sensitisers, see: Wagner (2009); Takadate et al. (1995). For a related structure, see: Da & Quan (2010).
Data collection: CrysAlis PRO (Oxford Diffraction, 2009); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SJ5289 ).
RK thanks the Department of Biotechnology and the Department of Information Technology, Government of India, New Delhi, for their financial support of the Centre for Bioinformatics, Pondicherry University, Puducherry. NST [No. F. 14-2(ST)/2010 (SA-III)] thanks the UGC for a Rajiv Gandhi National Fellowship to pursue his PhD degree. HSPR and VT thank the Council for Scientific and Industrial Research (CSIR), New Delhi, for financial support.
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