Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.257, 259-267, 1994
Molecular and Crystal-Structure of C-(2-Phenoxy-1-Vinyl)-N-N-Bromophenyl Nitrone and C-(2-Phenoxy-1-Vinyl)-N-Phenyl Nitrone
An X-ray study of the crystals of C-(2-phenoxy-1-vinyl)-N-n-bromophenyl nitrone (I) and C-(2-phenoxyl-vinyl)-N-phenyl nitrone (II) has been performed. The main crystal data of I : C15H12NO2Br, a = 10.807(5) Angstrom, b = 10.275(5) Angstrom, c = 15.415(7) Angstrom, beta = 129.7(2)degrees, M = 318.14, V = 1525(2) Angstrom(3), d(calc) = 1.385(3) g/cm(3) Space gr. P2(1)/b, Z = 4. The main crystal data of II : C15H13NO2, a = 12.760(4) Angstrom, b = 19.784(6) Angstrom, c = 9.805(4) Angstrom, M = 239.64, V = 2475(1) Angstrom(3), d(calc) = 1.284(2) g/cm(3), Space gr. Pbna, Z = 8. The crystal packing of I and II is characterized by the presence of centrosymmetric dimer associates (CDA) existing due to stable intermolecular hydrogen bonds (IMHB). Such a crystalline structure of these nitrones accounts for the possibility of intermolecular proton transfer along the O --> O coordinate to form a coloured quinoid product.