Received 22 December 2012
aDepartment of Physics, SMK Fomra Institute of Technology, Thaiyur, Chennai 603 103, India,bDepartment of Organic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India, and cDepartment of Physics, Presidency College (Autonomous), Chennai 600 005, India
Correspondence e-mail: firstname.lastname@example.org
The title compound, C19H18O3, crystallizes with three molecules (A, B and C) in the asymmetric unit. The carbonyl O atom shows positional disorder over two sites in molecules A and B; the site-occupancy ratios are 0.76 (3):0.24 (3) and 0.86 (3):0.14 (3), respectively. The ethylene fragments in each molecule have an E conformation, while the C-O-C-C torsion angles indicate near planarity. The dihedral angles formed by the aromatic rings are 20.0 (1), 23.7 (1) and 16.1 (1)° for molecules A, B and C, respectively. Intramolecular C-HO hydrogen bonds occur in each molecule.
For the biological activities of chalcones, see: Xue et al. (2004); Lee et al. (2006); Bhat et al. (2005); Satyanarayana et al. (2004). For a related crown ether structure, see: Anh et al. (2011).
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 2012); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BX2434 ).
The authors thank Dr Babu Varghese and SAIF, IIT, Chennai, India, for the data collection.
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