Binding studies on substituted benzoic acids: Part I. 3,5-dinitrosalicylic acid—acid dissociation and complexation with nickel(II) and cobalt(II) |
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| Authors: | Phalguni Chaudhuri Roger S. Taylor |
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| Affiliation: | Institute für Anorganische Chemie der Universität Basel Switzerland;Department of Inorganic and Structural Chemistry, The University, LeedsEngland |
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| Abstract: | The values of pK1 and pK2 for 3,5-dinitrosalicylic acid (DNSA, H2L) have been determined at 25.0°C and 0.1 M ionic strength (sodium perchlorate) as 0.25 and 7.20. respectively. The binding of nickel(II) and cobalt(II) has been investigated over the pH range 1.0–7.0 at the same temperature and ionic strength. Values of log KML for the formation of the unprotonated complexes are 4.05±01 and 3.82±01 for nickel(II) and coball(ll) respectively. Values for log KMHL are close to 11 mol-1 for both metals; it seems probable that these species are not inner-sphere complexes, and possible reasons for this are suggested. The stability constants obtained are compared with others in the literature, and the possibility of using DNSA as a metal-ion indicator is discussed briefly. |
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