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Titolo:
Interaction of [Ln(DO2A)(H2O)(2-3)](+) and [Ln(DO2P)(H2O)(2-3)](-) with phosphate, acetate and fluoride anions in aqueous solution
Autore:
Kimpe, K; DOlieslager, W; Gorller-Walrand, C; Figueirinha, A; Kovacs, Z; Geraldes, CFGC;
Indirizzi:
Katholieke Univ Leuven, Dept Chem, B-3001 Louvain, Belgium Katholieke UnivLeuven Louvain Belgium B-3001 m, B-3001 Louvain, Belgium Univ Coimbra, Dept Biochem, P-3000 Coimbra, Portugal Univ Coimbra Coimbra Portugal P-3000 t Biochem, P-3000 Coimbra, Portugal Univ Texas, Dept Chem, Richardson, TX 75083 USA Univ Texas Richardson TX USA 75083 s, Dept Chem, Richardson, TX 75083 USA
Titolo Testata:
JOURNAL OF ALLOYS AND COMPOUNDS
, volume: 323, anno: 2001,
pagine: 828 - 832
SICI:
0925-8388(20010712)323:<828:IO[A[W>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALKALINE-EARTH METAL; LANTHANIDE(III) COMPLEXES; CONTRAST AGENTS; IONS; DYNAMICS; DO2A;
Keywords:
nuclear resonances; lanthanides; rare earths; MRI contrast agents;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Kimpe, K Katholieke Univ Leuven, Dept Chem, Celestijnenlaan 200F, B-3001 Louvain, Belgium Katholieke Univ Leuven Celestijnenlaan 200F Louvain Belgium B-3001
Citazione:
K. Kimpe et al., "Interaction of [Ln(DO2A)(H2O)(2-3)](+) and [Ln(DO2P)(H2O)(2-3)](-) with phosphate, acetate and fluoride anions in aqueous solution", J ALLOY COM, 323, 2001, pp. 828-832

Abstract

Mixed complexation of the lanthanide(III) chelates of the 1,7-disubstituted tetraazocyclododccane macrocycles DO2A and DO2P with phosphate, acetate and fluoride anions was studied in aqueous solutions using high resolution H-1 and P-31 NMR spectroscopy. The [La(DO2A)(H2O)(2-3)](+) and [Ce(DO2A)(H2O)(2-3)](+) chelates readily decompose in aqueous solutions containing phosphate anions. [Nd(DO2A)(H2O)(2-3)](+) and [Eu(DO2A)(H2O)(2-3)](+) chelates remain stable in an acetate environment. Association constants for the 1:1 adduct were obtained via 'H NMR titrations. In a fluoride environment, [La(DO2A)(H2O)(2-3)](+) was found to be unstable, in contrast to [Eu(DO2A)(H2O)(2-3)](+), for which the association constant for the 1:1 adduct was calculated. Chelate formation, as well as mixed complexation with fluoride and phosphate was studied for [Eu(DO2P)(H2O)(2-3)](-). The P-31 chemical shifts of[Eu(DO2P)(H2O)(2-3)](-) indicate that the DO2P macrocycle forms an 'in-cage' complex with binding through all four nitrogens. The [Eu(DO2P)(H2O)(2-3)](-) chelate gradually decomposes in a phosphate environment, but remains stable in an fluoride environment. (C) 2001 Elsevier Science B.V. All rightsreserved.

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Documento generato il 20/10/20 alle ore 05:19:13