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- W2078555746 abstract "The dissociation kinetics of selected trivalent lanthanide (Ln3+, Ln=La, Pr, Eu, Er, Lu) complexes of the macrocyclic ligand H2ODO2A (1-oxa-4,7,10-triazacyclododecane-4,10-diacetic acid), LnODO2A+, were studied in the [H+] range (0.1–2.4) × 10−4 M in the temperature range 15–45 °C. Excess Cu2+ ions were used as the scavenger for the ligand in acetate–acetic acid buffer medium. The dissociation reactions are independent of [Cu2+] and follow the rate law kobs = kd + kAC[Acetate] + K′klim[H+]/(1 + K′[H+]), where kd, kAC, and klim are the respective dissociation rate constants for the [H+]-independent, acetate-assisted, and the [H+]-dependent limiting pathways; K′ is the equilibrium constant for the protonation reaction LnODO2A+ + H+ ↔ LnODO2AH2+. The dissociation rates of LnODO2A+ complexes are all faster than those of the corresponding LnDO2A+ complexes (DO2A2− is the fully deprotonated dianion of the ligand H2DO2A, 1,4,7,10-tetrazacyclo-dodecane-1,7-diacetic acid), consistent with the notion that LnODO2A+ complexes are kinetically more labile and thermodynamically less stable than the corresponding LnDO2A+ complexes, and H2ODO2A is not pre-organized for Ln3+ ion complexation but H2DO2A is." @default.
- W2078555746 created "2016-06-24" @default.
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- W2078555746 date "2014-07-03" @default.
- W2078555746 modified "2023-09-27" @default.
- W2078555746 title "Dissociation kinetics of macrocyclic trivalent lanthanide complexes of 1-oxa-4,7,10-triazacyclododecane-4,10-diacetic acid (H2ODO2A)" @default.
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- W2078555746 doi "https://doi.org/10.1080/00958972.2014.945923" @default.
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