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Thermal decomposition of some metal chelates of substituted hydrazopyrazolones

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Abstract

The thermal dissociation of 1-phenyl-3-methyl-4-(X-phenylhydrazo)-5-pyrazolone metal chelates [M(XPhHyPy)](X=m-OH (I),m-OCH3(II),m-COOH (III),p-CH3 (IV),p-OCH3 (V) orp-COCH3 (VI) was studied by TG, DTG and differential thermal analysis (DTA). A rough sequence of thermal stability, obtained from the peak maximum temperatures, for the various metal chelates was Hg(II)<Cu(II)<Fe(III)<UO2(II). The bonding of the ligands to metal ions was investigated by elemental analysis and infrared spectroscopy. The number and relative energies of nitrate combiantion frequencies are discussed in terms of the complexation of para-substituted hydrazopyrazolone with Th(IV) and UO2(II) metal ions.

Zusammenfassung

Mittels TG, DTG und DTA wurde die thermische Dissoziation der 1-Phenyl-3-methyl-4(x-phenylhydrazo)-5-pyrazolon-Metallchelate [M(x-PhHyPy)](x=m-OH(I),m-OCH3(II),m-COOH(III),p-CH3(IV),p-OCH3(V) undp-COCH3(VI) untesucht. Die anhand der Peakmaxima-Temperaturen erhaltene ungefähre Reihenfolge für die thermische Stabilität lautete: Hg(II) Cu(II) Fe(III) UO2(II). Die Bindung der Liganden an den Metallionen wurde mittels Elementaranalyse und IR-Spektraldaten, untersucht. Außerdem wurde die Anzahl und die relativen Energien von Nitrat-Kombinationsfrequenzen bei der Komplexierung von para-substituiertem Hydrapyrazolon mit Th(IV)- und UO2(II) Metallionen diskutiert.

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  1. Chemistry Department Faculty of Education, Ain Shams University, Heliopolis, Cairo, Egypt

    S. L. Stefan

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Stefan, S.L. Thermal decomposition of some metal chelates of substituted hydrazopyrazolones. Journal of Thermal Analysis 42, 1299–1312 (1994). https://doi.org/10.1007/BF02546938

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  • DOI: https://doi.org/10.1007/BF02546938

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