Acta Cryst. (2009). E65, o20-o21  [ doi:10.1107/S1600536808038002 ]

6,6'-Dimethoxy-2,2'-[2,2-dimethylpropane-1,3-diylbis(nitrilomethylidyne)]diphenol

C. S. Yeap, H. Kargar, R. Kia and H.-K. Fun

Abstract: The title Schiff base compound, C₂₁H₂₆N₂O₄, exhibits two crystallographically independent molecules in the asymmetric unit with similar conformations. The imino groups are coplanar with the benzene rings; the maximum deviations of the N atoms from the planes comprising the benzene rings and the imino groups are -0.037 (4), 0.013 (4), -0.021 (5), and 0.008 (5) Å. The dihedral angles between the benzene rings in the two molecules are 53.64 (17) and 51.93 (17)°. Strong intramolecular O-HN hydrogen bonds generate S(6) ring motifs. The N atoms are also in close proximity to the H atoms of the dimethylpropane groups, with HN distances between 2.54 and 2.75 Å. The crystal structure is further stabilized by weak intermolecular C-HO hydrogen bonds, weak intermolecular C-H interactions and - contacts involving the imine C atom and two C atoms from the adjacent benzene rings.

Online 3 December 2008

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