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Spectrophotometric study of complex formations between 1-(2-pyridylazo)-2-naphthol (PAN) and some metal ions in organic solvents and the determination of thermodynamic parameters.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2011-03-09)
Z Safari, M B Gholivand, L Hosseinzadeh
ABSTRACT

The complexation reactions between Ni(2+), Co(2+) and Zn(2+) metal ions with PAN in methanol (MeOH), acetonitrile (AN) and dimethyl sulfoxide (DMSO) were studied using a spectrophotometric method. The stability constants of the resulting complexes were determined from computer fitting absorbance mole-ratio data. The results revealed that the stability constants of complexes are varying in order of Ni(2+)<Zn(2+)<Co(2+) for all solvents. The values of the thermodynamic parameters (ΔH°, ΔS° and ΔG°) for complexation reactions were obtained from the temperature dependence of the stability constants.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
1-(2-吡啶偶氮)-2-萘酚, indicator grade