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    11-Butyl-3-methoxy-11H-benzo[a]carbazole
    (Int Union Crystallography, 2010) Ergun, Yavuz; Gundogdu, Cevher; Tercan, Baris; Ermis, Emel; Hokelek, Tuncer
    The title compound, C21H21NO, consists of a carbazole skeleton with a methoxybenzene ring fused to the carbazole, and a butyl group attached to the carbazole N atom. The carbazole skeleton is nearly planar [maximum deviation = 0.078 (2) angstrom], and it is oriented at a dihedral angle of 4.22 (4)degrees with respect to the adjacent methoxybenzene ring.
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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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    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.
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    Ethyl 1-oxo-1,2,3,4-tetrahydro-9H-carbazole-3-carboxylate
    (Int Union Crystallography, 2009) Hokelek, Tuncer; Dal, Hakan; Tercan, Baris; Gocmenturk, Mustafa; Ergun, Yavuz
    The title compound, C15H15NO3, contains a carbazole skeleton with an ethoxycarbonyl group at the 3 position. In the indole ring system, the benzene and pyrrole rings are nearly coplanar, forming a dihedral angle of 1.95 (8)degrees. The cyclohexenone ring has an envelope conformation. In the crystal structure, pairs of strong N-H center dot center dot center dot O hydrogen bonds link the molecules into centrosymmetric dimers with R-2(2)(10) ring motifs. pi-pi contacts between parallel pyrrole rings [centroid-centroid distance = 3.776 (2)angstrom] may further stabilize the structure. A weak C-H center dot center dot center dot O interaction is also observed.
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    Ethyl 4-hydroxy-9-tosyl-9H-carbazole-3-carboxylate
    (Int Union Crystallography, 2009) Hokelek, Tuncer; Dal, Hakan; Tercan, Baris; Gulle, Sibel; Ergun, Yavuz
    In the title compound, C22H19NO5S, the carbazole skeleton is nearly planar [maximum deviation = 0.043 (1) angstrom] with the pyrrole ring oriented at dihedral angles of 2.32 (6) and 1.77 (6)degrees with respect to the adjacent benzene rings. The dihedral angle between the benzene ring of the tosyl group and the carbazole skeleton is 82.25 (5)degrees. Intramolecular O-H center dot center dot center dot O hydrogen bonding results in the formation of a planar six-membered ring, which is oriented at a dihedral angle of 3.06 (4)degrees with respect to the adjacent carbazole skeleton. In the crystal structure, weak intermolecular C-H center dot center dot center dot O interactions link the molecules into infinite chains and pi-pi contacts between the benzene rings and between the pyrrole and benzene rings [centroid-centroid distances = 3.374 (1) and 3.730 (1) A, respectively] may further stabilize the structure. A weak C-H center dot center dot center dot pi interaction is also present.
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    Ethyl 4-oxo-2,3,4,9-tetrahydro-1H-carbazole-3-carboxylate
    (Int Union Crystallography, 2011) Gundogdu, Cevher; Gocmenturk, Mustafa; Ergun, Yavuz; Tercan, Baris; Hokelek, Tuncer
    In the title compound, C15H15NO3, the carbazole skeleton includes an ethoxycarbonyl group at the 3-position. In the indole ring system, the benzene and pyrrole rings are nearly coplanar, forming a dihedral angle of 0.89 (4)degrees. The cyclohexenone ring has an envelope conformation. In the crystal, intermolecular N-H...O and C-H...O hydrogen bonds link the molecules into a three dimensional network. A weak C-H...pi interaction is also observed.