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Nickel and Cobalt Complexes of Non-protein L-Norvaline and Antioxidant Ferulic Acid: Potentiometric and Spectrophotometric Studies |
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| Authors: | Artik Elisa Angkawijaya Ahmed E Fazary Erzalina Hernowo Suryadi Ismadji Yi-Hsu Ju |
| Institution: | 1. Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei, 106-07, Taiwan 2. Chemistry Department, Faculty of Science, King Khalid University, Abha, 9004, Saudi Arabia 3. Applied Research Sector, Egyptian Organization for Biological Products and Vaccines, Cairo, Egypt 4. Department of Chemical Engineering, Widya Mandala Surabaya Catholic University, Kalijudan 37, Surabaya, 60114, Indonesia |
| Abstract: | Binary and mixed-ligand complexes of Ni2+ and Co2+ involving L-norvaline (Nva) and ferulic acid (FA) have been investigated in aqueous solutions by pH potentiometry and UV?Cvisible spectrophotometric techniques, at 298.15 K and fixed ionic strength (0.15?mol?dm?3, NaNO3). The overall stability constants of the Ni2+ and Co2+ complexes with the ligands studied were obtained by the HYPERQUAD2008 program from the pH-potentiometric data. As a result of the numerical treatment, a model composed of seven species NiNva+, NiNva2, NiNvaH?1, $\mathrm{NiNva}_{ - 2}^{ -}$ , NiFA, $\mathrm{NiFAH}_{ - 1}^{ -}$ and NiNvaFA? was obtained for the Ni2++Nva+FA system, whereas for the Co2++Nva+FA system the complexes CoNva+, CoNva2, CoNvaH?1, $\mathrm{CoNvaH}_{ - 2}^{ -}$ , CoFA, $\mathrm{CoFAH}_{ - 1}^{ -}$ , and CoNvaFA? were obtained. The complex species distributions in certain pH ranges were calculated by the HySS2009 simulation program. Spectroscopic UV?Cvisible measurements were carried out to give qualitative information about the complexes formed in these solutions. |
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