Premium
Calculation of the formation constant of the 1:1 complex between manganese( II ) and the anion of 2‐mercaptopyridine N ‐oxide (pyrithione) by polarographic measurements
Author(s) -
Galvín R. Marín,
Angulo M.,
Mellado J. M. Rodríguez
Publication year - 1997
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140090817
Subject(s) - polarography , manganese , chemistry , ion , constant voltage , manganese oxide , inorganic chemistry , constant (computer programming) , stability constants of complexes , oxide , analytical chemistry (journal) , nuclear chemistry , voltage , chromatography , organic chemistry , physics , computer science , quantum mechanics , programming language
Polarograms of mixtures of Mn II and the anion of 2‐mercaptopyridine N ‐oxide (pyrithione) in neutral media do not show separate waves for the metal ion, either complexed or not, nor for the ligand, free or in the complex. The two‐electron reduction of Mn II is shown to be an E r E i process in the absence of ligand and C r E r E i process in the presence of ligand, with a fast previous reaction. From measurements made at constant Mn II concentration and variable ligand concentration it is shown that the 1:1 complex is formed. The logarithm of the formation constant of this complex is obtained from these and other measurements, this value being log K f = 3.76 ± 0.03.