Synthesis, spectral and thermodynamic study of mixed metal and mixed ligand complexation of cobalt(II) and nickel(II) in aqueous solution
| Main Authors: | Ghusoon Faidhi Hameed, Fawzi Yahya Waddayi, Ahmed Hassoon Mageed |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 2020
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/5075393 |
Daftar Isi:
- The method of absorption spectrophotometry was applied to study the complex formation in Co(II)–Ni(II)–amino acid (aspartic H2Asp and glutamic H2Glu)–EDTA (H4Edta) systems for molar ratios of 1:1:1:1:1 components. Mathematical modeling of optical density dependence on the acidity of solution (A=f(pH)) for different wavelength in the range 300–950 nm showed that depending on the ratio of the reagents and the solution acidity, formation of the complex [(CoAsp)Edta(NiGlu)]4–. Stability constants and electronic absorption spectra of this complex was calculated; thier possible structur was suggested, and also calculated thermodynamic parameters (ΔG, ΔH°, and ΔS°) for the studying complexes were calculated according to the values of stability constant (KST) at 25 °C obtained from the temperature dependence of stability constant by using van’t Hoff equation.