Received 8 June 2013
aDepartment of Physics, Yuvaraja's College (Constituent College), University of Mysore Mysore, Karnataka 570 005, India,bDepartment of Chemistry Kuvempu University, Shankaraghatta Shimoga, Karnataka, India,cDepartment of Studies and Research in Chemistry, U.C.S, Tumkur University, Tumkur, Karnataka 572 103, India, and dDepartment of Studies and Research in Chemistry, Tumkur University, Tumkur, Karnataka 572 103, India
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The title compound, C31H27F3O7, is a liquid crystal and exhibits enantiotropic SmA and nematic phase transitions. In the crystal, the the 2H-chromene ring system makes dihedral angles of 54.46 (17) and 7.79 (16)°, respectively, with the central benzene ring and 4-(heptyloxy)benzene ring. The three F atoms of the -CF3 group are disordered over two sets of sites, with an occupancy ratio of 0.62 (3):0.38 (3). The crystal structre features two pairs of C-HO hydrogen bonds, which form inversion dimers and generate R22(10) and R22(30) ring patterns. C-HO interactions along  and C-H interactions futher consolidate the packing, leading to a three-dimensional network.
Data collection: APEX2 (Bruker, 2009); cell refinement: APEX2 and SAINT-Plus (Bruker, 2009); data reduction: SAINT-Plus and XPREP (Bruker, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: KJ2229 ).
The authors thank Professor T. N. Guru Row and Vijithkumar, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, for the data collection. BSPM thanks H. T. Srinivasa, Raman Research Institute, Bangalore, for his help with the characterization.
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