Chelation behaviour of nitroso-pyrazolones with Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)

Infrared (IR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TG), derivative thermogravimetric analysis (DTG), differential thermal analysis (DTA) and molar conductivity studies have been carried out on the chelates of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with 3-methyl- and 3-ph...

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Bibliographic Details
Published in:	Journal of thermal analysis and calorimetry Vol. 73; no. 3; pp. 939 - 950
Main Authors:	ABDEL-LATIF, S. A, EL-ROUDI, O. M, MOHAMED, M. G. K
Format:	Journal Article
Language:	English
Published:	Dordrecht Springer 2003 Springer Nature B.V
Subjects:	Carbonyls Chelates Chelation Chemistry Coordination compounds Coordination numbers Copper Differential thermal analysis Differential thermogravimetric analysis Electrolytes Exact sciences and technology Infrared analysis Inorganic chemistry and origins of life Ligands Manganese Metal oxides Nickel NMR Nonelectrolytes Nuclear magnetic resonance Oxygen atoms Preparations and properties Pyrazolones Thermal decomposition Thermogravimetric analysis Water chemistry Zinc Divalent metal Complexes Cobalt Complexes Nitroso compound Nickel Complexes Nitrogen heterocycle NMR spectrometry Copper Complexes conductivity Pyrazole derivatives Zinc Complexes Electrical properties Manganese Complexes Ionic conductivity Thermogravimetry Organic ligand Differential thermal analysis transition metals chelates Transition metal Complexes DTA Absorption spectrometry NMR TG nitrosopyrazolones Thermal analysis absorption spectra
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Summary:	Infrared (IR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TG), derivative thermogravimetric analysis (DTG), differential thermal analysis (DTA) and molar conductivity studies have been carried out on the chelates of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with 3-methyl- and 3-phenyl-4-nitroso-5-pyrazolones. The solid chelates were synthesized, separated, analyzed and their structures were elucidated. The data obtained show that almost all of the prepared chelates contain water molecules in their coordination sphere. The initial stage in the thermal decomposition process of these chelates shows the presence of water molecule, the second denotes to the intermediate products. The final decomposition products were found to be the respective metal oxides. The NMR spectrum of 3-methyl-4-nitroso-5-pyrazolone ligand shows the existence of the oxime rather than the nitroso form. 3-phenyl-4-nitroso-5-pyrazolone acts as a neutral bidentate ligand whereas 3-methyl-4-nitroso-5-pyrazolone acts as monobasic bidentate ligand bonded to the metal ions through the two oxygen atoms of the carbonyl and nitroso groups. The solid chelates prepared behave as non-electrolytes in DMF solution. The coordination numbers of the obtained chelates using 3-methyl-4-nitroso-5-pyrazolone are four on applying the mole ratio 1:1 and six on using 1:2 mole ratio. In case of using the ligand 3-phenyl-4-nitroso-5-pyrazolone the coordination number is six in both cases.
ISSN:	1388-6150 1588-2926
DOI:	10.1023/A:1025815521606