Structure and complexation equilibria of metal(II) ions with 4-arylazopyrazoles |
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Authors: | Ahmed H Amrallah Ramadan M Awadallah Esam Y El-Haty |
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Institution: | (1) Chemistry Department, Faculty of Science, Assiut University, Aswan, Egypt |
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Abstract: | Summary Octahedral mononuclear and tetrahedral binuclear 4-arylazo-3,5-diaminopyrazole complexes of copper(II), nickel(II), cobalt(II)
and manganese(II) have been prepared and characterized by elemental analysis, conductivity measurements and by i.r., 1H n.m.r. and electronic spectroscopy. Complexation equilibria, stoichiometry and stability constants were measured in 40%
(v/v) EtOH-H2O medium and I = 0.1 mol dm −3 NaClO4. In mild acidic media, the ligands behave as neutral NN′ bidentates, while in alkaline media they act as N2N2′ tetradentate ligands. |
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