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https://hdl.handle.net/10316/109983| Title: | 7,7'-Dihy-droxy-4,4'-dimethyl-3,4-dihydro-2H,2'H-4,6'-bichromene-2,2'-dione | Authors: | Pereira Silva, P. S. Parveen, Mehtab Ali, Akhtar Malla, Ali Mohammed Silva, M. Ramos |
Keywords: | single-crystal X-ray study; T = 293 K; mean (C–C) = 0.002 A°; R factor = 0.040; wR factor = 0.109; data-to-parameter ratio = 18.6 | Issue Date: | 18-Dec-2010 | Publisher: | International Union of Crystallography | Project: | SFRH/BD/38387/ 2008 | Serial title, monograph or event: | Acta Crystallographica Section E: Structure Reports Online | Volume: | 67 | Issue: | Pt 1 | Abstract: | The title compound, C(20)H(16)O(6), which contains one chiral centre, crystallizes as a racemate. The mean planes of the two coumarin units make a dihedral angle of 88.07 (2)°. The pyrone ring containing the chiral centre adopts a sofa conformation. In the crystal, four mol-ecules are linked by O-H⋯O hydrogen bonds, forming a tetrameric ring with graph-set motif R(4) (4)(32). These tetramers are further linked by O-H⋯O hydrogen bonds into a three-dimensional network. | URI: | http://hdl.handle.net/10316/109983 | ISSN: | 1600-5368 | DOI: | 10.1107/S160053681005244X | Rights: | openAccess |
| Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| 77Dihydroxy44dimethyl34dihydro2H2H4-6bichromene22dioneActa-Crystallographica-Section-E-Structure-Reports-Online.pdf | 402.04 kB | Adobe PDF | View/Open |
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