Abstract
Stability constants (log β) of ternary complex of Mn II with sulfadiazine, sulfisoxazole, sulfamethaxyzole, sul-famethazine, sulfathiazole, sulfacetamide and sulfanilamide as primary ligands and cephazolin as secondary ligands were reported at pH = 7.30 ± 0.01 at μ = 1.0 M NaClO 4 at 25 °C by polarographic technique. The kinetic parameters like transfer coefficient (a), degree of irreversibility (λ), diffusion coefficient (D) and rate constant (k), were determined. The rate constants (k) that varied from 3.61 cm s -1 to 9.93 cm s -1 confirmed the quasi-reversible nature of electrode processes. The study was carried out at 25 °C and 35 °C. Thermodynamic parameters such as entropy change (AS), enthalpy change (ΔH) and free energy change (AG) were determined. The values of stability constants (log β) that varied from 1.75 to 9.13 showed these drugs or their complexes might be effective against Mn toxicity.
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