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    Öğe
    Crystal structure of rac-3-hydroxy-2-(p-tolyl)-2,3,3a, 4,7,7a-hexahydro-1H-4,7-methanoisoindol-1-one
    (Int Union Crystallography, 2015) Aslantas, Mehmet; Celik, Cumali; Celik, Omer; Karayel, Arzu
    In the title compound, C16H17NO2, the cyclohexene ring adopts a boat conformation, and the five-membered rings have envelope conformations with the bridging atom as the flap. Their mean planes are oriented at a dihedral angle of 86.51 (7)degrees. The molecular structure is stabilized by a short intramolecular C-H center dot center dot center dot O contact. In the crystal, molecules are linked by O-H center dot center dot center dot O hydrogen bonds forming chains propagating along [100]. The chains are linked by C-H center dot center dot center dot pi interactions, forming slabs parallel to (001).
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    Öğe
    X-Ray crystal structure analysis and determination of azo-enamine and hydrazone-imine tautomers of two hetarylazo indole dyes
    (Wiley, 2007) Oezbey, Sueheyla; Karayel, Arzu; Kavak, Guelten; Seferoglu, Zeynel; Ertan, Nermin
    Two hetarylazo indole dyes were analyzed by single crystal X-ray diffraction. Dye 1, C18H14N4O, crystallises in the monoclinic system, space group P2(1)/c, with two independent molecules in the asymmetric unit. Dye 2, C20H16N4, also crystallises in the monoclinic system, space group P2(1)/c, Z = 4. In both compounds, there are two intramolecular C-H...N hydrogen bonds which influenced the molecular conformation between the azo group and the indole ring system and its phenyl substituent. Each of the independent molecules of dye 1 interact through the N-H...N hydrogen bond, whereas no classical intermolecular hydrogen bond was observed in dye 2. The molecules of dye 1 and dye 2 are packed differently in both structures.