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Titolo:
NMR CONFORMATIONAL STUDY OF THE LANTHANIDE(III) COMPLEXES OF DOTA IN AQUEOUS-SOLUTION
Autore:
MARQUES MPM; GERALDES CFGC; SHERRY AD; MERBACH AE; POWELL H; PUBANZ D; AIME S; BOTTA M;
Indirizzi:
UNIV COIMBRA,DEPT BIOCHEM P-3049 COIMBRA PORTUGAL UNIV TEXAS,DEPT CHEM RICHARDSON TX 75083 UNIV LAUSANNE,INST CHIM MINERALE & ANALYT CH-1005 LAUSANNE SWITZERLAND UNIV TURIN,DIPARTIMENTO CHIM INORGAN FIS & MAT TURIN ITALY
Titolo Testata:
Journal of alloys and compounds
fascicolo: 1-2, volume: 225, anno: 1995,
pagine: 303 - 307
SICI:
0925-8388(1995)225:1-2<303:NCSOTL>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE SPECTROSCOPY; MACROCYCLIC LIGAND; CONTRAST AGENTS; LUMINESCENCE; TETRAAZA; DYNAMICS; CRYSTAL; SHIFTS;
Keywords:
NUCLEAR MAGNETIC RESONANCE; AQUEOUS SOLUTION; CHELATES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
M.P.M. Marques et al., "NMR CONFORMATIONAL STUDY OF THE LANTHANIDE(III) COMPLEXES OF DOTA IN AQUEOUS-SOLUTION", Journal of alloys and compounds, 225(1-2), 1995, pp. 303-307

Abstract

Variable temperature NMR spectroscopy studies of lanthanide(III) complexes with 1,4,7,10-tetraazacyclododecane-N,N',N '',N'''-tetraacetic acid (DOTA) provide evidence of the presence of two isomeric forms in aqueous solution. An NMR study was performed in order to gain structural information on the two isomeric species, using a fitting procedure of calculated to experimental dipolar contributions to the paramagneticshifts. The two isomers show to have identical macrocyclic ring conformations and differ only in the coordination or orientation of the acetate arms of the ligand, yielding either square prismatic and square anti-prismatic coordination geometries, or octadentate and heptadentatecoordinations of the ligand relative to the lanthanide ion. Analysis of the dipolar shifts is consistent with both types of acetate conformational equilibria.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 02:53:54