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    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.