The formation of mixed ligand complexes of Co (II), Ni(II) and Zn(II) with thiosalicylicacid H₂SR and diethylenetriamine E in aqueous ethanol (50% v/v) was investigated by the potentiometric method at 298 and 313 K. The thermodynamic functions ∆F°, ∆H° and ∆S° have been evaluated.
PL
Przy użyciu metod potencjometrycznych badano powstawanie mieszanych kompleksów Co(II), Ni(II) i Zn(II) z kwasem tiosalicylowym (H₂SR) i dietylenotriaminą (E ) w roztworach etanolowo-wodnych (5D% v/v } w temp. 298 i 313 K. Obliczono towarzyszące powstawaniu kompleksów zmiany funkcji termodynamicznych: ∆F°, ∆H° i ∆S°.
Praca została nadesłana na III polsko-radzieckie sympozjum "Termodynamika i elektrochemia roztworów elektrolitów".
EN
The interaction between Co(II) ions and thiolactic acid TLA or thioglycolic acid TGA in aqueous 0.1 M NaClO₄ has been studied potentiometrically at 20°. The formation of complexes of the type Co(SRC00) and Co(SRC00)²⁻₂ (where R - CH₂ or CH₃CH) has been found. The stability constants of these complexes have been determined as well as the acid dissociation constants of TLA and TGA. Thiolactic acid and thioglycolic acid, belong to a physiologically important class of compounds. As they behave as strong complexing agents, it seemed to be interesting to comparise the stabilities of Co(II) complexes with these acids.
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