Yazar "Kocak, O" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    Comparison of Calorimetric and Ir-Spectroscopic Data For Alcohols and Alcoholic Solutions
    (Plenum Publ Corp, 1982) Kleeberg, H; Kocak, O; Luck, Wap
  • Küçük Resim Yok
    Öğe
    Investigation of H-bond on fluorescence changes in benzene derivations and different acceptor systems
    (Scientific Technical Research Council Turkey, 1997) Bayri, NA; Kocak, O
    In this study, benzene derivatives of phenol and naphtol were selected as donor systems and mixed with dioxane and TEA (triethylamine), which were chosen as accepters. II-bond formation in the phenol-triethylamine binary system was investigated by both UV absorption and emission spectroscopies. The changes in the absorption and emission spectra. by H-bond formation and the equilibrium of the H-bonded complexes were studied at both the ground and excited states. In addition, equilibrium constants at different temperatures and thermodynamic properties related to equilibrium (enthalpy, fere energy change and entropy values of II-bond formation) were calculated. A shift to longer wavelengths and differences in absorption and fluorescence intensities in the absorption and emission spectra were observed. Moreover, II-bond formation in various solvents with different dielectric constants was investigated. Changes in entropy related to the formation of hydrogen bonded. complexes generally had negative values at both ground and excited states. These values were observed to increase with the increase in the dielectric constants of the solvent systems; therefore, I-I-bonded complexes grew more stable with the increase in the dielectric constants of the solvent systems.
  • Küçük Resim Yok
    Öğe
    Thermodynamic and kinetic parameters concerning complex formation between 3-hydroxy- and 1-aminopyrene and pyridine
    (Scientific Technical Research Council Turkey, 2002) Acar, N; Kocak, O
    Systems formed by the pyrene derivatives 3-hydroxypyrene and 1-aminopyrene with pyridine,ere studied. The thermodynamic and kinetic parameters of the systems were calculated using the changes in the absorption and emission spectra which occur due to hydrogen bond or complex formation. The decrease of the formation rate constant in the series methylcyclohexane, benzene, and o-chlorotoluene may be due to a more difficult formation of the hydrogen bond complex due. to the increase of the dielectric constant in the solvent series.