Potentiometric study of the Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) complexes with 3-hydroxy-2-naphthalene carboxylic acid |
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| Institution: | 1. Institute of Pharmaceutics, School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 518107, China;2. Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;1. Department of Chemistry, Middle East Technical University, 06800 Ankara, Turkey;2. Department of Chemistry, Kafkas University, 36100 Kars, Turkey;3. Department of Chemistry, Giresun University, 28200 Giresun, Turkey;1. Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China;2. The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen 518033, China;3. Zhongshan-Xuhui Hospital, and the Shanghai Key Laboratory of Medical Epigenetics, the International Co-laboratory of Medical Epigenetics and Metabolism (Ministry of Science and Technology), Institutes of Biomedical Sciences, Fudan University, Shanghai, China;1. Universidad Nacional de Colombia, Department of Chemistry, Av. Carrera 14 # 127-25, Cundinamarca 11001, Bogotá, Colombia;2. Pontifical Catholic University of Minas Gerais, Department of Mechanical Engineering, Av. Dom José Gaspar, 500, CEP 30535-610 Belo Horizonte, MG, Brazil |
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| Abstract: | Formation constants of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) complexes with 3-hydroxy-2-naphthalene carboxylic acid have been determined potentiometrically in a 50% (v/v) dioxane—water solution at 25°C and 0.2 M KNO3. Experimental data are analysed using several computer programs. The obtained values for the log of the formation constant of the first 1 : 1 (metal : ligand) complex with the different metals are: Co 7.9, Ni 7.1, Cu 10.44, Zn 7.8 and Cd 7.3. The log of the formation constant for the 1 : 2 copper complex is 18.20. It is to be noted that Ni(II) yields a 1 : 1 complex weaker than expected from the Irving—Williams series. |
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