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    2-(Naphthalen-1-yl)-4-(naphthalen-1-ylmethylidene)-1,3-oxazol-5(4H)-one
    (Int Union Crystallography, 2011) Gundogdu, Cevher; Alp, Serap; Ergun, Yavuz; Tercan, Baris; Hokelek, Tuncer
    In the title compound, C24H15NO2, the oxazole ring is oriented at dihedral angles of 10.09 (4) and 6.04 (4)degrees with respect to the mean planes of the naphthalene ring systems, while the two naphthalene ring systems make a dihedral angle of 4.32 (3)degrees. Intramolecular C-H center dot center dot center dot N hydrogen bonds link the oxazole N atom to the naphthalene ring systems. In the crystal, intermolecular weak C-H center dot center dot center dot O hydrogen bonds link the molecules into centrosymmetric dimers. pi-pi contacts between the oxazole and naphthalene rings and between the naphthalene ring systems [centroid-centroid distances = 3.5947 (9) and 3.7981 (9) angstrom] may further stabilize the crystal structure. Three weak C-H center dot center dot center dot pi interactions also occur.
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    Öğe
    2-(Naphthalen-1-yl)-4-(thiophen-2-ylmethylidene)-1,3-oxazol-5(4H)-one
    (Wiley-Blackwell, 2011) Gundogdu, Cevher; Alp, Serap; Ergun, Yavuz; Tercan, Baris; Hokelek, Tuncer
    The asymmetric unit of the title compound, C18H11NO2S, contains two crystallographically independent molecules. In one molecule, the oxazole and thiophene rings are oriented at dihedral angles of 17.40 (9) and 18.18 (7)degrees with respect to the naphthalene ring system, while the oxazole and thiophene rings are oriented to each other at a dihedral angle of 0.86 (9)degrees. In the other molecule, the corresponding angles are 3.05 (8), 9.62 (6) and 7.02 (8)degrees, respectively. In each molecule, a weak intramolecular C-H...N hydrogen bond links the oxazole N atom to the naphthalene group. Weak intermolecular C-H...O hydrogen bonding is present in the crystal structure. pi-pi stacking between the oxazole and thiophene rings, between the thiophene and naphthalene rings, and between the oxaozole and naphthalene rings, [centroid-centroid distances = 3.811 (2), 3.889 (2), 3.697 (2) and 3.525 (2) A] may further stabilize the crystal structure.