Ibrahim Demir

Subtractive-FTIR spectroscopy to characterize organic matter in lignite samples from different depths.

Organic matter present in lignite samples collected from different depths (i.e. top, mid and bottom) of lignite source, Ilgın, Konya province, was examined by using subtractive-FTIR-ATR spectroscopy. FTIR spectra were recorded on (i) original samples, (ii) the samples dried at 105 °C and (iii) the samples acid-treated and dried. After a combustion process performed for each sample at 650 °C for 15 min, the spectra of samples were recorded and subtracted from the spectra of untreated samples. Hence, a software-based subtraction made it possible to acquire a representative spectra related with organic matter. As the contribution of the bands related with inorganic constituents in lignite samples were eliminated after spectrum-subtraction procedure, difference-spectra led analyzing the spectra related with organic matter in lignite samples, reasonably. Furthermore, the bands related with acidic functional groups, aromatic and aliphatic structures were analyzed on the basis of difference-spectra, easily. From the difference-spectra it was shown that an acid-treatment process under mild conditions caused shift in some specific bands related with carbonyl groups of carboxyls so that the band at around 1710 cm(-1) arisen, while the intensity of the band at around 1420 cm(-1) was diminished. Through the acid-treatment process, acidic groups in lignite samples from different depths were thought to be turned into similar forms by protonation and/or stripping of metal ions originally bonded. Difference-spectra acquired for acid-treated samples made it possible to evaluate the form of carboxylic acid groups present in the studied samples under specific environmental conditions. Hence, a facile and environmentally-friendly methodology was used to analyze organic matter in lignite by using FTIR spectra, and valuable information was acquired about the aliphatic, aromatic and acidic character of the studied lignite samples collected from different depths. The proposed methodology seems to be promising in acquiring approximate representative spectra for lignite organic matter by using little or no chemicals.

Synthesis and Characterization of Some Nickel(II), Cobalt(II), and Zinc(II) Complexes with Schiff Bases Derived from the Reaction of Isonitroso-p-chloroacetophenone and 1,2-Diaminoethane with 1,4-Diaminobutane

Two new Schiff bases have been synthesized by the condensation of 1,2-diaminoethane (HL) and 1,4-diamino buthane (HL′) with isonitroso-p-kloroasetafenon. The complexes of cobalt(II), nickel(II) and zinc(II) with HL and HL′ were prepared. The ligands and their complexes were characterized by spectroscopic techniques.

Synthesis, Characterization, and Spectroscopic Properties of a Symmetrical Schiff Base Ligand and its Bimetallic Complexes

This article presents the synthesis of new Schiff base ligand and preparation of its transition metal complexes with copper (II), nickel (II), zinc (II), and cobalt (II). Furthermore, absorption and fluorescence properties of ligand and its metal complexes are investigated. The effect of the solvents, such as N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), ethanol, methanol, 1,4-dioxane on fluorescence properties of metal complexes, are performed and obtained results are summarized. All of the structures were characterized by using spectroscopic techniques.

Synthesis and characterization of some metal complexes of isonitroso-2-acetylnaphthalene derivative

Nickel(II), copper(II), and zinc(II) complexes with the Schiff base obtained from isonitroso-2-acetylnaphthalene and 1,2-phenylenediamine were synthesized. The compounds were characterized by elemental analyses, FT-IR, UV-Vis, and 1H and 13C NMR spectra, conductance measurements, magnetic susceptibility measurements, and thermal analysis. The results suggest tetradentate coordination of the symmetrical Schiff base ligand through the two oxime oxygen atoms and two azomethine nitrogen atoms. The molar conductance data showed that the synthesized complexes are non-electrolytes.

tert-Butyl 3a-chloroperhydro-2,6a-epoxyoxireno[e]isoindole-5-carboxylate

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“Synthesis and properties of N′-hydroxy-2-(hydroxyimino)-N-(4-{[(2-hydroxyphenyl)-methylene]amino}-1-naphthyl)ethanimidamide and its metal complexes”

A new vicinal dioxime, N′-hydroxy-2-(hydroxyimino)-N-(4-{[(2-hydroxy-phenyl)methylene]amino}-1-naphthyl)ethanimidamide was synthesized. The initial compound for the synthesis of this dioxime was naphthalene. Complexes of this ligand were obtained with nickel, copper, and cobalt. The dioxime and its complexes were characterized by Fourier IR, UV, 1H NMR spectroscopy, mass spectrometry, elemental analysis, differential thermal analysis, and conductometric measurements.

Synthesis, electrochemical, and antibacterial activity of some novel N4O2 ligand derivativies

A novel ligand has been synthesized by the condensation of 1,3-diaminoprophane (HL) wıth isonitroso-p-chloroacetophenone. The complexes of cobalt(II), nicel(II), cupper(II) and zinc(II) with HL were prepared. All compounds were characterized by spectroscopic techniques and its antibacterial activities were determined by the disc diffusion method used against to those gram-positive and-negative bacteria. All compounds were investigated by cyclic voltammetry at 25°C. The voltammograms were recorded with a potential scan of 100 mV s−1.

Synthesis and characteristics of N-(glyoxyldioxime)-N′-(2-hydroxybenzylidene)-1,4-diaminonaphthalene and its metal complexes

A new vic-dioxime, N-(glyoxyldioxime)-N′-(2-hydroxybenzylidene)-1,4-diaminonaphthalene, was synthesized proceeding from naphthalene. Its complexes of nickel, copper and cobalt were prepared. The vicdioxime and its complexes were charecterized by FT-IR, UV, 1H NMR, mass spectrometry, elemental analysis, DTA/TG analysis techniques and conductometric measurements.