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The Zn 2+ /Ag + -pypo and pysu (pypo = 2-pyridylphosphonate, pysu = 2-pyridylsulfonate) complexes speciation in aqueous solution at  I  = 0.1 M (KNO 3 ) 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 (H 2 O) 2 ]} n (ClO 4 ) 2n ·2nH 2 O, was isolated and its spectral and structural properties were determined. An unusual pypo bidentate coordination mode is described and compared with published ones.

Complexing properties of 2-pyridylphoshonate and 2-pyridylsulfonate ligands for Zn 2+ and Ag + central atoms