Nazan Karapinar

THE SYNTHESIS AND Ni(II), Co(II), Cu(II), Cd(II), AND Zn(II) COMPLEXES OF TWO NEW UNSYMMETRICAL vic-DIOXIMES

Two new substituted aminoglyoximes, N-(4-ethylphenyl)amino-amphi-glyoxime [L1H2] and N-(4-ethylphenyl)amino-anti-glyoxime [L2H2], have been synthesized from amphi-chloroglyoxime and anti-chloroglyoxime and 4-ethylanilin. The preparation of nickel(II), cobalt(II), copper(II), zinc(II) and cadmium(II) complexes of the amphi- and anti-isomers of these ligands are described. All of these complexes are insoluble in common solvents. IR spectra and elemental analyses data of these complexes are given. Also, mass and 1H NMR spectra of these ligands are presented.

Spatial and Seasonal Variations of Disinfection Byproducts (DBPs) in Drinking Water Distribution Systems of Istanbul City, Turkey

This study presents the seasonal and spatial variations of trihalomethanes (THMs) and haloacetic acids (HAAs) in 30 sampling points within three water distribution systems of Istanbul City, Turkey. The effects of surface water quality, seasonal variation, and species differences were examined. The occurrence of chlorinated THMs and HAAs levels was considerably lower in the system in which raw water is subjected to pre-ozonation versus pre-chlorination. Seasonal analysis of the data indicated that the median concentration of four THMs (THM4) was higher than nine HAAs (HAA9) concentrations in all three distribution systems sampling points. For all distribution systems monitored, the highest median THM4 and HAA9 concentrations were observed in the spring and summer season, while the lowest concentrations of these disinfection byproduct (DBP) compounds were obtained in the fall and winter period. Due to the higher level of bromide in supplying waters of these two systems, moderate levels of brominated DBP species have been observed in the Kagithane and Buyukcekmece distribution systems districts. In fact, Spearman partial correlations (Spearman rank correlation coefficients [rs]) tend to be higher among analogues in terms of number and types of substituent, especially TCAA with TCM (rs 0.91), and DBAA with DBCM (rs 0.90). In contrast, the hydraulic (residence time and flow rate) and chemical mechanisms (hydrolysis, volatilization, and adsorption) affect the fate and transport of DBPs in distribution systems. Seasonal and spatial variations of DBPs presented in this study have important implications on regulatory issues and from an epidemiological point of view.

Synthesis of N'-(4'-benzo[15-crown-5]-phenylaminoglyoxime and its complexes with copper(II), nickel(II), and cobalt(II)

N′‐(4′‐Benzo[15‐crown‐5]phenylaminoglyoxime (H2L) and the sodium chloride adduct of N′‐(4′‐benzo[15‐crown‐5]phenylaminoglyoxime (H2L · NaCl) have been prepared from chlorophenylglyoxime, 4′‐aminobenzo[15‐crown‐5] and sodium bicarbonate or sodium bicarbonate and sodium chloride. Nickel(II), cobalt(II) and copper(II) complexes of H2L and H2L · NaCl have a metal‐ligand ratio of 1:2 and the ligand coordinates through the two N atoms, as do most of the vic‐dioximes. Their IR spectra and elemental analyses are given, together with 1H NMR spectra of the ligands.

Liquid-Liquid Extraction of Transition Metal Cations by Glyoximes and Their Macrocyclic Glyoxime Ether Derivatives

Liquid-liquid extraction of various alkalis (Li, Na, K, and Cs), transition metals (Co, Ni, Cu, Zn, Cd, and Hg), and Pb cations with phenylglyoxime (L1), p-tolylglyoxime (L2), N-(4-Benzo[15-crown-5])phenylaminoglyoxime (L3), and N-(4Benzo[15-crown-5])-p-tolylaminoglyoxime (L4) from the aqueous phase into the organic phase was carried out. For comparison, the corresponding two glyoximes and their macrocyclic glyoxime ether derivatives were also examined. Crown ether groups having ligands (L3, L4) carry especially Na cation from aqueous phase to organic phase. The extraction equilibrium constants (Kex) for complexes of ligands with Cu and Hg metal picrates between dichloromethane and water have been determined at 25C. The values of the extraction constants (log Kex) were determined to be 12.27, 13.37, 12.94, and 12.39 for Cu 2+ and 10.29, 10.62, 11.53, and 11.97 for Hg with L1–L4, respectively.

Synthesis, Characterization and Extraction Properties of Four Unsymmetricall vic‐Dioximes and their Complexes with Nickel (II), Cobalt (II) and Copper (II)

Four new unsymmetrical vic‐dioximes: [L 1 H 2 ] N‐(4‐acetanilidyl)amino‐amphi‐glyoxime, [L 2 H 2 ] N‐(4‐acetanilidyl)amino‐anti‐glyoxime, [L 3 H 2 ] N‐(2‐thiazolyl)amino‐amphi‐glyoxime and [L 4 H 2 ] N‐(2‐thiazolyl)amino‐anti‐glyoxime were prepared by the reaction of amphi‐chloroglyoxime and anti‐chloroglyoxime with 4‐aminoacetanilide and 2‐aminothiazol in absolute ethanol. The preparation Ni(II), Co(II), and Cu(II) complexes of the amphi‐and anti‐isomers of these ligands are described.The ligands and their complexes were characterized by elemental analyses, IR, mass, H1 and 13C NMR spectra and magnetic susceptibility measurements. Ligands complexing properties were studied by the liquid‐liquid extraction of selected alkali (Li+, Na+, K+, Cs+) and transition metals (Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Pb2+). It has been observed that all ligands show a high affinity to Cu2+ and Hg2+ ions, where as almost no affinity to alkali metals. The extraction equilibrium constants (K ex) for complexes of ligands with Cu2+ and Hg2+ metal picrates between dichloromethane and water have been determined at 25°C.

Synthesis and characterization of substituted aminobiphenylglyoximes and their complexes with some transition metals

In this study, four different new vic-dioximates, [L1H2] N-(4-ethylphenyl)amino-biphenylglyoxime, [L2H2] N-(4-butylphenyl)aminobiphenylglyoxime, [L3H2] N-(4-aminoacetanilide)aminobiphenylglyoxime, and [L4H2] N-(thiazol-2-yl-aminobiphenylglyoxime are synthesized from anti-4′-biphenylchloroglyoxime and the corresponding substituted aromatic amines. The Co(II), Ni(II), and Cu(II) complexes of these ligands are prepared. The structures of these new ligands and their complexes are proposed based upon IR, 1H, and 13C NMR spectral data, mass spectroscopy, magnetic susceptibility measurement, and elemental analyses.

Thermal, Electrical, and Optical Properties of Synthesized (1E, 2E)-(4-bromophenyl)(hydroxyimino)acetaldehyde Oxime Complexes

The (1E, 2E)-(4-bromophenyl)(hydroxyimino)acetaldehyde oxime complexes, [ML2], M = Co(II), Cu(II), and Ni(II), were synthesized and characterized by elemental analysis, magnetic susceptibility, FT-IR spectra, and thermal analysis techniques. The optical band gap of this ligand and its complexes were determined by UV-vis spectrophotometer in the wavelength range 300–800 nm. A decrease in the energy band gap of the [CoL2], [NiL2], and [CuL2] complexes has been observed compared with LH ligand. Temperature-dependent conductivity measurements showed that all samples behave like semiconductor. Activation energies calculated from Arrhenius plots showed that the conduction occurs via both intramolecular and the intermolecular processes.