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Polypyridinic ligand coordination to Zn2+ and Hg2+ metal ions

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Abstract

The thermodynamic parameters for the complexation reaction between Zn2+ and Hg2+ ions with the mixed amino-polypyridinic ligands tris[(2-pyridyl)methyl]amine (TPA) and 6,6-bis–bis (pyridylmethyl)aminomethyl]-2,2-bipyridine (BTPA) have been obtained in anhydrous dimethylsulfoxyde (DMSO) by using spectrophotometry, polarography, potentiometry and titration calorimetry. Complexes with stoichiometry 1:1 have been observed in all cases but Hg-TPA system, for which 1:2 complex is also formed. As found in water, both \(\Updelta G_{\rm{j}}^{\circ}\) and \(\Updelta H_{\rm{j}}^{\circ}\) become more favorable when going down along the group. From a comparison of data with those reported for other metal ions in DMSO (Co2+, Ag+, Cd2+) and in water as solvent, it is shown that TPA is more selective towards Hg2+ in water than in DMSO and that the selectivity of BTPA in DMSO is much higher towards Cd2+ and Hg2+ ions with respect to Zn2+.

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Acknowledgements

The authors are grateful to Prof. Anders Døssing (Department of Chemistry, University of Copenhagen, Denmark) for providing the BTPA ligand.

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Authors and Affiliations

  1. Dipartimento Chimica Fisica e Ambiente, University of Udine, Via Del Cotonificio 108, 33100, Udine, Italy

    Andrea Melchior, Cristian Grazioli & Marilena Tolazzi

  2. Dipartimento Scienze Chimiche e Farmaceutiche, Via Giorgieri 1, 34127, Trieste, Italy

    Claudio Tavagnacco

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  1. Andrea Melchior
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  2. Cristian Grazioli
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  4. Marilena Tolazzi
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Correspondence to Andrea Melchior.

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Melchior, A., Grazioli, C., Tavagnacco, C. et al. Polypyridinic ligand coordination to Zn2+ and Hg2+ metal ions. J Therm Anal Calorim 119, 1267–1272 (2015). https://doi.org/10.1007/s10973-014-4214-4

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