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  • Küçük Resim
    Öğe
    N-(2-Hidroksi-3,4,5,6- Metoksibenzalidin) 2-3-İyodoanilin Moleküllerinin Sentezi ve Spektroskopik Yöntemlerle İncelenmesi
    (Selçuk Üniversitesi Fen-Edebiyat Fakültesi, 2006) Ünver, Hüseyin; Çolak, Naki
    Bu çalışmada 2-6 metoksi benzaldehit ile 2 ve 3-iyot anilinin kondensasyonundan elde edilen 8 adet yeni Schiff bazı sentezlenmiştir.
  • Küçük Resim
    Öğe
    Study on the Second Order Optical Properties of N-(2,4-dichloro)-salicylaldimine
    (Verlag der Zeitschrift fur Naturforschung, 2005) Karakaş, Aslı; Ünver, Hüseyin; Elmalı, Ayhan; Svoboda, Ingrid
    N-(2,4-Dichloro)-salicylaldimine was synthesized, characterized by elemental analysis, FT-IR, and UV-visible spectroscopy, and its crystal structure was determined. The title compound is almost planar and contains short intramolecular O-H... N hydrogen bonds [O1-N1 2.601(1) Å]. It remains transparent in the visible region and has solvatochromic behavior in the UV region in the range 198 349 nm, implying non-zero microscopic first hyperpolarizability. The ab-initio quantum mechanical calculations (finite field second-order Møller Plesset perturbation theory) of the studied compound have been carried out to compute the electric dipole moment (?) and the first hyperpolarizability (?) values. The ab-initio results also show that this ligand might have microscopic nonlinear optical behavior with non-zero values.
  • Küçük Resim
    Öğe
    Syntheses, Structures and Second-order Nonlinear Optical Behavior of (E)-N-(4-Nitrobenzylidene)-3,4-Dimethylaniline and (E)-N-(3-Nitrobenzylidene)-3,4-Dimethylaniline
    (Verlag Z Naturforsch, 2010) Ünver, Hüseyin; Karakaş, Aslı; Durlu, Tahsin Nuri
    (E)-N-(4-Nitrobenzylidene)-3,4-dimethylaniline (1) and (E)-N-(3-nitrobenzylidene)-3,4-dimethylaniline (2) have been synthesized, and their crystal structures have been determined by X-ray diffraction analysis. Linear optical characteristics have been evaluated experimentally using UV/Vis spectroscopy and theoretically using the configuration interaction (CI) method. The maximum one-photon absorption (OPA) wavelengths of the studied compounds are shorter than 450 nm, giving rise to good optical transparency in the visible and near IR regions. The ab initio quantum-mechanical calculations (finite field second-order Moller-Plesset perturbation theory) of the investigated molecules have been carried out to compute the electric dipole moment (mu) and the first hyperpolarizability (beta) values. The ab initio results suggest that the title compounds might have microscopic second-order nonlinear optical (NLO) behavior with non-zero values.