Table 1 Protonation constants of BZmacropa and thermodynamic stability constants of its Ln3+ complexes determined by pH potentiometry (25 °C and I = 0.1 M KCl)
From: 18-membered macrocycle appended on resin for selective rare earth element extraction and separation
BZmacropaa | macropab | CHX-macropac | |
|---|---|---|---|
log Ka1 | 7.10(3) | 7.41 | 7.77 |
log Ka2 | 6.51(6) | 6.85 | 6.95 |
log Ka3 | 3.51(9) | 3.32 | 3.17 |
log Ka4 | 2.58(9) | 2.36 | 2.51 |
log Ka5 | 1.96 | ||
log KLaL | 13.45(5) | 14.99 | 14.54 |
log KCeL | 13.03(6) | 15.11 | 14.38 |
log KPrL | 13.01(2) | 14.70 | 13.89 |
log KNdL | 12.62(4) | 14.36 | 13.57 |
log KDyL | 9.89(6) | 11.72 | 10.34 |
log KLuL | 6.69(4) | 8.25 | 6.70 |
