Complexing properties of 2-pyridylphoshonate and 2-pyridylsulfonate ligands for Zn2+ and Ag+ central atoms
2022
Abstract
The Zn(2+)/Ag(+)-pypo and pysu (pypo = 2-pyridylphosphonate, pysu = 2-pyridylsulfonate) complexes speciation in aqueous solution at I = 0.1 M (KNO3) and 25 °C is described in detail under our experimental synthetic conditions. Protonation and stability constants were determined, and distribution diagrams show protonated and deprotonated complexes formation in the case of Zn(2+)/Ag(+) pypo/pysu binary system, respectively.
Moreover, the new complex, {[Zn(H(2)pypo)(2)(H2O)(2)]}(n)(ClO4)(2n) . 2n H2O, was isolated and its spectral and structural properties were determined. An unusual pypo bidentate coordination mode is described and compared with published ones.