Bekir Bati

Determination of copper, nickel and cadmium by faas after preconcentration with zinc-piperazinedithiocarbamate loaded on activated carbon by solid-phase extraction

ABSTRACT A method was developed for the preconcentration of copper, nickel and cadmium in water samples, prior to their determination by FAAS, using the Zn-piperazinedithiocarbamate complex (ZnPDC) loaded on activated carbon. In this method, Cu, Ni and Cd in liquid phase quantitatively replaced zinc on a ZnPDC-activated carbon solid phase. Afterwards, the metals on the solid phase were easily eluted by Hg (II) solution into aqueous phase, and were measured by FAAS. The optimum experimental parameters such as pH, sample volume, and effect of matrix ions for the preconcentration of the metals were investigated. The range of linearity 0-6, 0-5, 0-3 μgml−1, correlation coefficient 0.998, 0.996, 0.999, detection limits 15.7, 23.5, 11.8 ngml−1 and determination limits 136, 179, 98 ngml−1 in final Hg(II) solution were obtained for Cu, Ni and Cd, respectively. The proposed method has been employed for the determination of Cu, Ni and Cd in various standard metal alloys and natural water samples.

SYNTHESIS, CHARACTERIZATION, AND SPECTRAL AND THERMAL STUDIES OF SOME DIVALENT TRANSITION METAL COMPLEXES OF BENZYLPIPERAZINE DITHIOCARBAMATE

Potassium benzylpiperazine dithiocarbamate (KBPDTC) and its complexes with Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) have been synthesized and characterized. On the basis of elemental analyses, magnetic moments and spectral data, the monoanionic BPDTC ligand coordinates to the metal ions via both sulfur atoms of the -NCS2 group, acting as a bidentate ligand. The Ni(II) complex has a square-planar coordination geometry, while the other complexes are suggested to exhibit a square-pyramidal coordination environment. The thermal reactivity of KBPDTC.H2O and its metal complexes has been studied by means of DTA and TG techniques. Thermoanalytical data show that decomposition of the metal complexes of KBPDTC under nitrogen gives the corresponding metal thiocyanates as stable solid intermediates.

The Synthesis and Characterization of Substituted Aminomethylglyoximes and Aminophenylglyoximes and Their Complexes with Some Transition Metals

In this study, six new unsymmetrical vic‐dioximes, N‐(3,4‐dimethyl‐phenyl)aminomethylglyoxime (L1H2), N‐(3‐chloro‐4‐methylphenyl)aminomethyl‐glyoxime (L2H2), N‐(2,6‐dimethylphenyl)aminomethylglyoxime (L3H2), N‐(3,4‐dimethylphenyl)aminophenylglyoxime (L4H2), N‐(3‐chloro‐4‐methylphenyl)‐aminophenylglyoxime (L5H2) and N‐(2,6‐dimethylphenyl)aminophenylglyoxime (L6H2) have been synthesized from chloromethylglyoxime or chlorophenylglyoxime and the corresponding substituted aromatic amines. The Co(II), Ni(II) and Cu(II) complexes of these ligands were prepared. The structures of these new ligands and their complexes are proposed based upon IR, UV‐Vis, 1H NMR spectral data, magnetic measurements, and elemental analyses.

Synthesis and Characteriza Tion of Copper(II) Phthalocyanina Tes Substituted With Four Aza Macrocycle Groups

Abstract The syntheses of ligands and Cu(II) phthaiocyaninale complexes substituted with four {diaza and triaza) macrocycles are described and the compounds were characterized by elemental analyses, IR, 1H NMR, UV/VIS and thermogravimetric analysis.

Supramolecular Self-Organization in Mercury(II) Dicyclopentyldithiophosphate Polynuclear Complex

In the monomeric unit [Hg(μ-S2P(OCp)2) (S2P(OCp)2)] (Cp = cyclopentyl) moiety, the one dithiophosphate ligand acts as a chelating ligand and the other one acts as a bridging ligand by their sulfur atoms. The monomeric units arrange in order to give rise to an infinite polymeric structure along the direction of the b axis by the two-fold screw axis. The compound displays a supramolecular self-organization in the solid state through the additional Hg····S (3.516 Å) secondary interactions with formation of chain-like polymeric arrays. Also, there are some weak intra- and intermolecular hydrogen bonds between some of the hydrogen atoms of Cp and S atoms. The intermolecular hydrogen bonds form infinite polymeric chains that lie along the b axis, to each other, and along the c axis to contribute to the supramolecular association. Supplemental materials are available for this article. Go to the publishers online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.

Synthesis and Spectroscopic Characterization of Four New Substituted Piperazineglyoximes and Their Complexes with Some Transition Metals

Abstract Four new substituted piperazineglyoximes. 4-methyl-1-piperazineglyoxime (MPGH2) 4-benzyl-1-piperazineglyoxime (BPGH2), 1.2-bis(4-methylpiperazine)glyoxime (BMPGH2) and 1,2-bis(4-benzylpiperazine)glyoxime (BBPGH2) have been synthesized by the reactions of anti-chloroglyoxime or dichloroglyoxime with substituted piperazines in ethanol. All these glyoximes are in the anti-form according to 1H NMR. 13C NMR and IR spectral data. The complexes of Cu(II). Co(II) and Ni(II) with these four glyoxime ligands have been prepared and characterized by using IR and UV-VIS spectral data and elemental analyses

Ammonium O,O-dicyclohexyl phosphorodithioate

The structure of the title compound, NH4+.C12H22O2PS2-, consists of a polymeric arrangement of ammonium cations and O,O-dicyclohexyl phosphorodithioate anions linked through N-H...O and N-H...S hydrogen bonds. These interactions result in the formation of (100) sheets.

THE SYNTHESIS AND CHARACTERIZATION OF NEW UNSYMMETRICAL vic-DIOXIMES AND THEIR COMPLEXES WITH SOME TRANSITION METALS

In this study, three new unsymmetrical vic-dioimes, N-(4-methoxy-phenyl)aminomethylglyoxime (L1H2), N-(5-chloro-2-methoxyphenyl)amino-methylglyoxime (L2H2) and N-(3-chloro-4-methoxyphenyl)aminomethylglyoxime (L3H2) have been synthesized from chloromethylglyoxime and the corresponding substituted aromatic amines. Mononuclear metal complexes of these ligands have been synthesized with Co(II), Ni(II) and Cu(II) salts. The structures of these new compounds are proposed based upon elemental analyses, 1H NMR, IR spectral data and magnetic measurements.

Synthesis of Eight New Substituted Phenylamino and Diaminoglyoximes and their Complexes with Some Transition Metals

Abstract Eight new substituted phenylamino and diaminoglyoximes; N-(3-methylphenyl)aminoglyoxime (MPAGH2), N-(2,6-dimethylphenyl)amino-glyoxime (DMPAGH2), N-(2-chloro-4-methylphenyl)aminoglyoxime (CMPAGH2), N-(2,4-dichlorophenyl)aminoglyoxime (DCPAGH2), N,N′-bis-(3-methylphenyl)diaminoglyoxime (BMPAGH2), N,N′-bis(2,6-dimethyl-phenyl)diaminoglyoxime (BDMPAGH2), N,N′-bis-(2-chloro-4-methyl-phenyl)diaminoglyoxime (BCMPAGH2), and N,N′-bis(2,4-dichlorophenyl)-diaminoglyoxime (BDCPAGH2) have been synthesized by the reactions of anti-chloroglyoxime and dichloroglyoxime with substituted aromatic amines in absolute ethanol. All these dioximes are in the anti-form according to IR and 1H NMR spectral data. The Ni(II), Cu(II) and Co(II) complexes of eight vic-dioximes have been prepared and their structures have been determined by using IR and UV-VIS spectral data and elemental analyses.