Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

The existence of the red-orange protonated MLH complexes (λ_max = 490 nm, ε_max = 16 700 mmol^-1 cm², log ^*β₁₁₁ = -0.51 for Zn(II) and λ_max = 490 nm, ε_max = 20 800 mmol^-1 cm², log ^*β₁₁₁ = -1.28 for Cd(II)) and of the red-purple ML and ML₂ complexes (λ_max = 517 nm, ε_max = 27 500 mmol^-1 cm², log ^*β₁₁₂ = -2.8 and λ_max = 527 nm, ε_max = 61 500 mmol^-1 cm², log ^*β₁₂₄ = -6.0 for Zn(II) and λ_max = 522 nm, ε_max = 27 200 mmol^-1 cm², log ^*β₁₁₂ = -3.9 and λ_max = 522 nm, ε_max = 52 000 mmol^-1 cm², log ^*β₁₂₄ = -8.2 for Cd(II) ions) was demonstrated in aqueous medium by numerical interpretation of the absorbance curves by the SQUAD-G minimization program. Conditions were proposed for development of a spectrophotometric method for the determination of Zn(II) and Cd(II) using 1-PAN-4S.