Acta Cryst. (2009). E65, o1322-o1323  [ doi:10.1107/S1600536809018029 ]

7,7',8,8'-Tetramethoxy-4,4'-dimethyl-3,5'-bichromene-2,2'-dione

H.-K. Fun, S. R. Jebas, M. Parveen, Z. Khanam and R. M. Ghalib

Abstract: In the title molecule, C₂₄H₂₂O₈, the mean planes of the two coumarin units are inclined to each other at a dihedral angle of 79.93 (3)°. The attached methoxy groups form torsion angles of 7.65 (19) and 78.36 (14)° with respect to one coumarin unit, and angles of 9.01 (16) and 99.08 (11)° with respect to the other coumarin unit. In the crystal structure, weak intermolecular C-HO hydrogen bonds connect pairs of molecules to form dimers, generating R₂²(16) and R₂²(18) rings; the dimers are linked by further weak intermolecular C-HO hydrogen bonds, forming extended chains. Additional stabilization is provided by weak C-H interactions.

Online 20 May 2009

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