Yazar "Polat, Kamran" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ X ]
    Öğe
    Electroanalytical determination of metronidazole in tablet dosage form
    (Serbian Chemical Soc, 2013) Yilmaz, Selehattin; Baltaoglu, Esra; Saglikoglu, Gulsen; Yagmur, Sultan; Polat, Kamran; Sadikoglu, Murat
    In this study, the electrochemical reduction and determination of metronidazole were easily realized in Britton-Robinson buffer (pH 4.01) using an UTGE by cyclic voltammetric (CV) and differential pulse voltammetric (DPV) techniques. In this acidic medium, one irreversible and a sharp cathodic peak were observed. A linear calibration curve for DPV analysis was constructed in the metronidazole concentration range 3 x10(-6)-9x10(-5) mol L-1. The limit of detection (LOD) and limit of quantification (LOQ) were 1.42x10(-7) and 4.76x10(-7) mol L-1 respectively.
  • [ X ]
    Öğe
    Experimental and theoretical characterization of the 2-(4-bromobenzyl)-5-ethylsulphonyl-1,3-benzoxazole
    (Elsevier, 2015) Zeyrek, Celal Tugrul; Unver, Huseyin; Arpaci, Ozlem Temiz; Polat, Kamran; Iskeleli, Nazan Ocak; Yıldız, Mustafa
    Synthesis, crystal structure, Fourier transform infrared spectroscopy (FT-IR) and quantum mechanical studies of the 2-(4-bromobenzyl)-5-ethylsulphonyl-1,3-benzoxazole (C16H14NO3SBr) have been reported. The molecular structure obtained from X-ray single-crystal analysis of the investigated compound in the ground state has been compared using Hartree-Fock (HF) and density functional theory (DFT) with the functional B3LYP and B1B95 using the 6-311++G(d,p) basis set. In addition to the optimized geometrical structures, atomic charges, molecular electrostatic potential (MEP), natural bond orbital (NBO), nonlinear optical (NLO) effects and thermodynamic properties of the compound have been investigated by using DFT. The potential energy surface (PES) scans about four important torsion angles are performed by using B3LYP/6-311++G(d,p) level of theoretical approximation for the compound. The experimental (FT-IR) and calculated vibrational frequencies (using DFT) of the title compound have been compared. The total molecular dipole moment (mu), linear polarisability (alpha), and the first-order hyperpolarisability (beta) were predicted by using DFT with different basis sets 6-31G(d), 6-31+G(d,p), 6-31++G(d,p), 6-311+G(d) and 6-311++G(d,p) for investigating the effects of basis sets on the NLO properties. Our computational results yield that beta(tot) for the title compound is greater than those of urea. The standard thermodynamic functions were obtained for the title compound with the temperature ranging from 200 to 450 K. (C) 2014 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Synthesis, spectroscopic studies and electrochemical properties of Schiff bases derived from 2-hydroxy aromatic aldehydes and phenazopyridine hydrochloride
    (Serbian Chemical Soc, 2013) Yagmur, Sultan; Yilmaz, Selehattin; Saglikoglu, Gulsen; Sadikoglu, Murat; Yıldız, Mustafa; Polat, Kamran
    Novel Schiff bases 1-4 were synthesized by the reaction of 2-hydroxybenzaldehyde, 2-hydroxy-5-methoxybenzaldehyde, 2-hydroxy-5-nitrobenzaldehyde and 2-hydroxy-1-naphthaldehyde with phenazopypridine hydrochloride (PAP), respectively, and their structures were elucidated by means of spectroscopic techniques. The electrochemical reduction of PAP and its Schiff bases (1-4) were realized on a glassy carbon electrode (GCE) in dimethyl sulfoxide (DMSO) using the cyclic voltammetric (CV) technique. The effect of functional groups on reduction potential of the Schiff bases was investigated. A general electrochemical reduction mechanism of the compounds is suggested.