Abstract
Electron spin resonance spectroscopy was used to study manganese(II) complexes with several organic ligands in aqueous solutions. The concentration formation constants of manganese complexes with deprotonated (L) and monoprotonated (HL) phosphonoacetic acid (PAA) were determined at different ionic strengths. These values were extrapolated to the zero ionic strength in order to determine the thermodynamic values of the complexation constants. The values obtained are: log K PAA HL = 3.5 ± 0.2, and log K PAA L = 6.3 ± 0.1. The formation constants of manganese complexes with phosphonoformic acid (PFA), 3-phosphonopropionic acid (3-PPA), and citric acid were measured at ionic strength of 0.05 and were found to be: log K PFA HL = 2.57 ± 0.05, log K PFA L = 5.34 ± 0.05, log K 3-PPA HL = 1.6 ± 0.2, log K 3-PPA L = 3.15 ± 0.04, and log K citric acid L = 4.28 ± 0.04. In aqueous solutions manganese(II) ion does not appear to form complexes with the crown ethers 12C4, 15C5, or 18C6, while the cryptand C211-Mn(II) complex has a log K f of 1.6 ± 0.1.
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