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  • [ X ]
    Öğe
    Intramolecular hydrogen bonding and tautomerism in N-(3-pyridil)-2-oxo-1-naphthylidenemethylamine
    (Springer/Plenum Publishers, 2001) Ünver, H; Yildiz, M; Zengin, DM; Özbey, S; Kendi, E
    N-(3-pyridil)-2-oxo-1-naphthylidenemethylamine (C16H12N2O) was studied by elemental analysis, IR, H-1 NMR, and UV-visible techniques and X-ray diffraction methods. The UV-visible spectrum of the compound was investigated in solutions effect polarity. The polarity of the some solvents was modifierly the additional (CF3COOH) and [(C2H5)(3)N]. The compound is in tautomeric equilibrium (phenol-imine O-H...N and keto-amine O...H-N forms) in polar and nonpolar solvents. The keto-amine form is observed in basic solutions of DMSO, ethanol, chloroform, benzene, cyclohexane, and in acidic solutions of chloroform and benzene, but not in acidic solutions of DMSO and ethanol. The compound crystallizes in the monoclinic, space group P2(1)/a with a = 7.010(5) Angstrom, b = 13.669(4) Angstrom, c = 12.764(4) Angstrom, beta = 101.23(4)degrees, V = 1199.6(10) Angstrom(3), Z = 4, D-c = 1.375 g/cm(3), mu(MoKalpha) = 0.088 mm(-1), R = 0.045 for 1658 reflections [I > 2sigma(I)]. The title compound is not planar two Schiff base moieties A [C1-C11, O1] and B [N1, C12, C13, N2, C14, C15, C16] are inclined at an angle of 27.4(1)degrees reflecting mainly the twist about C12-N1 [C11-C12-N1-C13, 29.7(2)degrees]. There is a strong intramolecular hydrogen bond (O-H...N) of 2.529(2) Angstrom.
  • [ X ]
    Öğe
    Spectroscopic studies, antimicrobial activities and crystal structures of N-(2-hydroxy-3-methoxybenzalidene) 1-aminonaphthalene
    (Elsevier, 2005) Ünver, H; Yildiz, M; Dülger, B; Özgen, Ö; Kendi, E; Durlu, TN
    Schiff base N-(2-hydroxy-3-methoxybenzalidene)1-aminonaphthalene has been synthesized from the reaction of 2-hydroxy-3-methoxybenzaldehyde with 1-aminonaphthalene. The compound were characterized by elemental analysis, FT-IR, H-1 NMR, C-13 NMR and UV-visible techniques. The UV-visible spectra of the Schiff base were studied in polar and nonpolar solvents in acidic and basic media. The structure of the compound has been examined cyrstallographically. There are two independent molecules in the asymmetric unit. It crystallizes in the monoclinic space group P2(l)/c, with unit cell parameters: a=14,602(2), b=5,800(1), c= 16,899(1) Angstrom, V= 1394.4(2) Angstrom(3) D-x=1.321 g cm(-3) and Z = 4. The crystal structure was solved by direct methods and refined by full-matrix least squares to a find R = 0.041 of for 1179 observed reflections. The title compound's antimicrobial activities also have been studied. The antimicrobial activities of the ligand has been screened in vitro against the organisms Escherichia coli ATCC 11230, Staphylococcus aureus ATCC 6538, Klebsiella pneumoniae UC57, Micrococcus luteus La 2971, Proteus vulgaris ATCC 8427, Pseudomonas aeruginosa ATCC 27853, Mycobacterium smegmatis CCM 2067, Bacillus cereus ATCC 7064 and Listeria monocytogenes ATCC 15313, the yeast cultures Candida albicans ATCC 1023 1, Kluyveromyces fragilis NRRL 2415, Rhodotorula rubra DSM 70403, Debaryomyces hansenii DSM 70238 and Hanseniaspora guilliemodii DSM 3432. (C) 2004 Elsevier B.V. All rights reserved.