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EnglishThe thermodynamic parameters for the complexation reaction between Zn2+ and Hg2+ 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 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 delta G and delta H become more favorable when going down along the group. From a comparison of data with those reported for other metal ions in DMSO (Co2+, Ag2+, 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+.
| Titolo: | Polypyridinic ligand coordination to Zn2+ and Hg2+ metal ions |
| Autori: | |
| Data di pubblicazione: | 2015 |
| Rivista: | |
| Abstract: | The thermodynamic parameters for the complexation reaction between Zn2+ and Hg2+ 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 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 delta G and delta H become more favorable when going down along the group. From a comparison of data with those reported for other metal ions in DMSO (Co2+, Ag2+, 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+. |
| Handle: | http://hdl.handle.net/11368/2831857 |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1007/s10973-014-4214-4 |
| Appare nelle tipologie: | 1.1 Articolo in Rivista |
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http://hdl.handle.net/11368/2831857
