Potentiometric study of Cu(II) and Ni(II) complexation with two high molecular weight poly(acrylic acids) |
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Authors: | Morlay C Cromer M Mouginot Y Vittori O |
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Institution: | Laboratoire d'Electrochimie Analytique, Laboratoire d'Instrumentation et de Chimie Analytique en Solution, Université Claude Bernard Lyon 1, CPE, 43 Bvd du 11 novembre 1918, 69622 Villeurbanne Cedex, France |
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Abstract: | The copper (II) or nickel (II) complex formation with two poly(acrylic acids) of high molecular weight (Mw=2.5×105 and 3×106) was investigated in aqueous dilute solution (NaNO3 0.1 mol l−1; 25°C). Potentiometric titrations were carried out, first to precise the acid-base properties of the two polymers, and secondly to determine the stability constants of the MA and MA2 complex species formed. The Bjerrum's method, modified by Gregor et al. (J. Phys. Chem., 59 (1955) 34–39), for the study of polymeric acids was used. The results obtained showed that both polymers present very similar properties. As expected, copper (II) is more readily bound to poly(acrylic acids). CuA2 was the predominant observed species; the global stability constant log β102 was found to be close to 6.6. With nickel (II), none of the complex species MA or MA2 becomes predominant (log β102=5.5). Finally, the PAA complexes present a greater stability compared with that of monomeric analogs. |
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Keywords: | High molecular weight poly(acrylic acids) Copper (II) Nickel (II) Complexation Potentiometry |
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