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Solid, Primary aliphatic amine complexes of transition metal halides

II. Thermal analysis studies of RNH2 complexes of cadmium(II) chloride

Journal of Thermal Analysis and Calorimetry
Authors: G. Kenessey and G. Liptay

Abstract  

The thermal decomposition of some new primary aliphatic amine RNH2 (R=methyl-, ethyl-,n-propyl,i-propyl,n-butyl-,i-butyl-,n-amyl-,i-amyl-, cyclohexyl-andi-allyl-) complexes with cadmium(II) chloride, prepared by solid-gas phase chemisorption, have been investigated by simultaneous TG-DTG-DTA. The enthalpy changes during the degradation were followed by DSC. The course of the thermal decomposition is described in detail. The thermal properties observed were compared to the more recently reported nickel(II) analogues. The changes in thermal parameters in the series of cadmium(II) chloride aliphatic amine complexes are discussed on the basis of the inductive releasing effect of the aliphatic chain and the steric hindrance of the ligands.

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Solid, primary aliphatic amine complexes of transition-metal halides

I. Thermal studies on RNH2 complexes of nickel(II) chloride withR=H, CH3, CH3CH2, CH3(CH2)2, (CH3)2CH, CH3(CH2)3, (CH3)2CHCH2

Journal of Thermal Analysis and Calorimetry
Authors: G. Kenessey and G. Liptay

The thermal decomposition characteristics of the ternary mixed, solid, primary aliphatic amine complexes formed with nickel(II) chloride was investigated by a simultaneous TG-DTG-DTA method.

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Thermal analysis is found to be suitable methods to investigate the electrical aging of polyethylene.

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Summary  

Mixed ligand nickel(II) complexes of different compositions were prepared with water, sulfate ion and 1,2-ethanediol as ligands. The magnetic susceptibility data, the IR spectra and the thermoanalytical curves of the complexes were recorded. Oxygen atoms bound by one or two coordinate bonds to the metal ion, or by hydrogen-bonds in the crystal state were observed. All complexes are sensitive for moisture. The bis complex proved to be the more stable complex.

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Abstract  

In present work we have investigated the commonly used base silicone elastomers namely cured poly-dimethyl-siloxanes and the change of the inner polarity of silicone elastomers containing various amounts of polar liquid ingredients and trifunctional silicone additives. It was shown that the polarity of the inside of the matrix is related to the diffusion properties of model substances and thermal properties of silicone elastomers. The ingredients used have changed the matrix framework, that was influenced by the type of trifunctional additive too. These properties show large dependence on the timing of the measurement. Measurements carried out after 48 hour of the production of the polymer showed reproducible properties, indicating that the final structure of the polymer has been formed.These results show that the ingredients influence the properties of the silicone matrices considerably, thus the characteristics of the drug release of pharmaceutical forms can be varied too.

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Pyridine-type complexes of transition metal halides

IV. Preparation and thermal studies on some new complexes of nickel(II)-halides formed with 2-, 3-, and 4-methyl-pyridines

Journal of Thermal Analysis and Calorimetry
Authors: G. Liptay, G. Kenessey, and P. Bukovec

Abstract  

Formation of nitrogen ligated complexes of types NiL6X2, NiL4X2, NiL2X2 and NiL1X2 (whereL=pyridine, 2-, 3- and 4-methyl-pyridine andX=F, Cl, Br, I) have been studied by traditional preparative methods, i.e. from solutions and by solid-gas phase chemisorption. Quaternary mixed complexes were obtained by chemisorption from heated intermediates. The complexes thus formed were further analysed by simultaneous TG-DTG-DTA. Effects of the ligands on stoichiometry and thermal properties of the complexes are discussed.

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Abstract  

Mixed ligand complexes of different compositions were prepared with water, sulfate ion and 1,2-ethanediol as ligand. IR spectra and the thermoanalytical curves of the complexes were recorded. Oxygen atoms bound by one or two coordinate bonds to the metal ion, or by hydrogen-bonds in the crystal, were observed. As for the water molecule, 1,2-ethanediol molecules of crystal and monohydrate type were found, depending on the type of binding of the oxygen atoms.

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The preparation and some properties of complexes ofp-tolylacetic acid with cobalt, nickel and copper are described. Magnetic measurements, electronic and far infrared spectra show that the metal complexes have octahedral structures. Infrared spectra indicate that coordination takes place through the carboxyl group to the metal ions and that the water molecule in each of the complexes is present as water of crystallisation. Thermogravimetry studies also show that the water molecules in each of the complexes do not form a coordinate bond with the metal ion. Differential thermal analysis show that the dehydration processes are accompanied by endothermic reactions. In each case the anhydrous metal complex undergoes an exothermic reaction to give the metal oxide.

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Pyridin type complexes of transition-metalhalides

I. Preparation, characterization and thermal analysis studies of cobalt(II)-chlorides with 2,3,4-methylpyridines

Journal of Thermal Analysis and Calorimetry
Authors: G. Liptay, G. Kenessey, L. Bihátsi, T. Wadsten, and J. Mink

A large number of Co-picoline-chlorides were prepared from different reaction media by changing the Co: picoline molar ratio.

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Abstract  

Parent and mixed-ligand cobalt(II) complexes of different compositions were prepared with water, sulfate ion and 1,2-ethanediol as ligands. The magnetic susceptibility data, the IR spectra and the thermoanalytical curves of the complexes were recorded. Oxygen atoms bound by one or two coordinate bonds to the metal ion, or by hydrogen-bonds were observed in the crystals pace.

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