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Titolo:
POTENTIOMETRIC, LUMINESCENCE AND NMR-STUDY OF THE INTERACTION OF EU-III WITH GLYCERYL PHOSPHATES
Autore:
ANDRE JPRF; BURROWS HD; GERALDES CFGC; MIGUEL MDM; TEIXEIRA MHSF; BOAS LFV;
Indirizzi:
UNIV COIMBRA,DEPT QUIM & BIOQUIM P-3049 COIMBRA PORTUGAL UNIV COIMBRA,DEPT QUIM & BIOQUIM P-3049 COIMBRA PORTUGAL UNIV MINHO,DEPT QUIM P-4700 BRAGA PORTUGAL ESTACAO AGRON NACL,INST TECHNOL QUIM & BIOL P-2870 OEIRAS PORTUGAL
Titolo Testata:
Polyhedron
fascicolo: 24, volume: 15, anno: 1996,
pagine: 4331 - 4340
SICI:
0277-5387(1996)15:24<4331:PLANOT>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIC MONOPHOSPHATE ESTERS; MAGNETIC-RESONANCE SHIFTS; IONS; COMPLEXES; PHOSPHATIDYLSERINE; SEPARATION; BINDING; CONTACT; FUSION;
Keywords:
TRIVALENT LANTHANIDE COMPLEXATION; GLYCERYL PHOSPHATES; EUROPIUM(III);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
J.P.R.F. Andre et al., "POTENTIOMETRIC, LUMINESCENCE AND NMR-STUDY OF THE INTERACTION OF EU-III WITH GLYCERYL PHOSPHATES", Polyhedron, 15(24), 1996, pp. 4331-4340

Abstract

Complexation of europium(III) with glyceryl-1- and -2-phosphates has been studied by metal ion luminescence,H-1 and C-13 NMR spectroscopy and potentiometry. From the luminescence and NMR studies, the formationof a 1:1 inner-sphere complex, in which the glyceryl phosphate is directly bound to the metal, is confirmed. Similar apparent binding constants at pH 2 were obtained by the three methods. Values obtained by NMR at pH 2 are 53 M(-1) and 12 M(-1) for glyceryl-1- and -2-phosphate, respectively. By comparison with literature data on related systems itis suggested that the ligands bind through the phosphate group. To obtain structural information from the NMR data, complexation has also been studied with the lanthanide ions Dy(III), Er(III) and Gd(III) using both chemical shift and relaxation data. From this, metal-proton distance ratios have been calculated. Comparison of H-1 and C-13 NMR Spectral data in the presence of paramagnetic lanthanides suggests conformational equilibria in the solutions. From the potentiometric studies, global formation constants have been determined, and speciation diagrams obtained over the pH range 1.5 less than or equal to pH less than or equal to 7.0 for ligand/metal ratios of 1 and 30. Implications of these results on lanthanide induced fusion of phospholipid membranes arediscussed. Copyright (C) 1996 Elsevier Science Ltd

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 14:30:49