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@article{858006,
author = {Campello, Maria Paula and Balbina, Marina and Santos, Isabel and Lubal, Přemysl and Ševčík, Radek and Ševčíková, Romana},
article_location = {Zürich, Switzerland},
article_number = {11},
keywords = {Macrocycles; Lanthanide complexes; NMR Spectroscopy; Kinetics; Protonation constants},
language = {eng},
issn = {0018-019X},
journal = {Helvetica Chimica Acta},
title = {Lanthanide(III) Complexes of 2-[4,7,10-Tris(phosphonomethyl)-1,4,7,10-tetraazacyclododecan-1-yl]acetic Acid (H7DOA3P): Multinuclear-NMR and Kinetic Studies},
url = {http://www3.interscience.wiley.com/journal/123189421/abstract},
volume = {92},
year = {2009}
}
TY - JOUR
ID - 858006
AU - Campello, Maria Paula - Balbina, Marina - Santos, Isabel - Lubal, Přemysl - Ševčík, Radek - Ševčíková, Romana
PY - 2009
TI - Lanthanide(III) Complexes of 2-[4,7,10-Tris(phosphonomethyl)-1,4,7,10-tetraazacyclododecan-1-yl]acetic Acid (H7DOA3P): Multinuclear-NMR and Kinetic Studies
JF - Helvetica Chimica Acta
VL - 92
IS - 11
SP - 2398-2413
EP - 2398-2413
PB - Verlag Helvetica Chimica Acta AG, Zürich
SN - 0018019X
KW - Macrocycles
KW - Lanthanide complexes
KW - NMR Spectroscopy
KW - Kinetics
KW - Protonation constants
UR - http://www3.interscience.wiley.com/journal/123189421/abstract
N2 - The protonation constants of 2-[4,7,10-tris(phosphonomethyl)-1,4,7,10-tetraazacyclododecan-1-yl]acetic acid (H7DOA3P) and of the complexes [Ln(DOA3P)]4- (Ln=Ce, Pr, Sm, Eu, and Yb) have been determined by multinuclear NMR spectroscopy in the range pD 2-13.8. Seven out of eleven protonation steps were detected (pK=13.66, 12.11, 7.19, 6.15, 5.77, 2.99, and 1.99), and the values found compare well with the ones for other related ligands. The protonation sequence for H7DOA3P was also tentatively assigned. Three protonation constants (pKMHL, pKMH2L, and pKMH3L) were determined for the lanthanide complexes. The acid-assisted dissociation of [Ln(DOA3P)]4- (Ln=Ce, Eu), in the region cH+=0.05-3.00 mol dm-3 and at different temperatures (25-60 degrees of Celsius), indicated that they have slightly the same kinetic inertness, being the [Eu(H2O)9]3+ aqua ion the final product for europium. The rates of complex formation for [Ln(DOA3P)]4- (Ln=Ce, Eu) were studied by UV/VIS spectroscopy in the pH range 5.6-6.8.
ER -
CAMPELLO, Maria Paula, Marina BALBINA, Isabel SANTOS, Přemysl LUBAL, Radek ŠEVČÍK a Romana ŠEVČÍKOVÁ. Lanthanide(III) Complexes of 2-[4,7,10-Tris(phosphonomethyl)-1,4,7,10-tetraazacyclododecan-1-yl]acetic Acid (H7DOA3P): Multinuclear-NMR and Kinetic Studies. \textit{Helvetica Chimica Acta}. Zürich, Switzerland: Verlag Helvetica Chimica Acta AG, Zürich, roč.~92, č.~11, s.~2398-2413. ISSN~0018-019X. 2009.
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