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Structure and complexation equilibria of metal(II) ions with 4-arylazopyrazoles

✍ Scribed by Ahmed H. Amrallah; Ramadan M. Awadallah; Esam Y. El-Haty

Publisher
Springer
Year
1994
Tongue
English
Weight
464 KB
Volume
19
Category
Article
ISSN
0340-4285

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✦ Synopsis

Octahedral mononuclear and tetrahcdral binuclear 4arylazo-3,5-diaminopyrazole complexes of eopper(II), nickel(II), eobalt(II) and manganese(II) have been prepared and characterized by elemental analysis, conductivity measurements and by i.r., ~H n.m.r, and electronic spectroscopy. Complexation equilibria, stoichiometry and stability constants were measured in 40~o (v/v) EtOH-H20 medium and I = 0.1 mol dm-3 NaC104" In mild acidic media, the ligands behave as neutral NN' bidentates, while in alkaline media they act as N2N~ tetradentate ligands.

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