Touradj Ameli | Harvard Medical School (original) (raw)

Papers by Touradj Ameli

Research paper thumbnail of Intra- versus intermolecular hydrogen bonds in salicylamide derivatives

Journal of Crystallographic and Spectroscopic Research, 1988

The crystal structures, solid-state infrared patterns, and thermal properties of two polymorphs o... more The crystal structures, solid-state infrared patterns, and thermal properties of two polymorphs of 4'-nitrosalicylanilide are presented. In both polymorphs, intramolecular hydrogen bonds are found between the phenol oxygen and the amide proton, and intermolecular hydrogen bonds are found between the amide carbonyl oxygen and the phenol proton. These hydrogen bond patterns are compared to those found in other known salicylamide derivatives and an analysis is given of the factors contributing to preferences for intra-or intermolecular hydrogen bonds in these structures. Crystal data: c~ polymorph, orthorhombic, Pbca, a = 11.003(4), b = 27.959(7), c = 7.622(5) .~, Z = 4, V = 2345(3) ~3, and R = 0.038 (1351 reflections);/3 polymorph, monoclinic, P2Ja, a = 28.36(1), b = 11.64(1), c = 7.293(8) A, r = 90.68(6) ~ Z = 8, V = 2408 .~3, and R = 0.043 (2425 reflections).

Research paper thumbnail of Intra- versus intermolecular hydrogen bonds in salicylamide derivatives

Journal of Crystallographic and Spectroscopic Research, 1988

The crystal structures, solid-state infrared patterns, and thermal properties of two polymorphs o... more The crystal structures, solid-state infrared patterns, and thermal properties of two polymorphs of 4'-nitrosalicylanilide are presented. In both polymorphs, intramolecular hydrogen bonds are found between the phenol oxygen and the amide proton, and intermolecular hydrogen bonds are found between the amide carbonyl oxygen and the phenol proton. These hydrogen bond patterns are compared to those found in other known salicylamide derivatives and an analysis is given of the factors contributing to preferences for intra-or intermolecular hydrogen bonds in these structures. Crystal data: c~ polymorph, orthorhombic, Pbca, a = 11.003(4), b = 27.959(7), c = 7.622(5) .~, Z = 4, V = 2345(3) ~3, and R = 0.038 (1351 reflections);/3 polymorph, monoclinic, P2Ja, a = 28.36(1), b = 11.64(1), c = 7.293(8) A, r = 90.68(6) ~ Z = 8, V = 2408 .~3, and R = 0.043 (2425 reflections).