Stability of bivalent metal complex with L-hydroxyproline

摘要

Potentiometric titration of L-hydroxyproline with NaOH solution at 30° ±0.1°C in a medium of constant ionic strenth, μ=0.1M(KNO3) gave the stepwise formation constants of the complexes formed between Mn(II), Co(II) and Zn(II) ions. The values were logK1=3.45; logK1=4.58, logK2=4.03; logK1=5.08, logK2=4.66; for Mn(II), Co(II) and Zn(II) complexes. The order of stability constant is in accordance with theIrving-Williamsser