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Titolo:
MULTINUCLEAR NUCLEAR-MAGNETIC-RESONANCE, STUDIES OF LEAD(II) SOAPS .3. STUDIES ON THE LIQUID-PHASE WITH REFERENCE TO THE BEHAVIOR OF THE CORRESPONDING ACIDS
Autore:
FEIO G; BURROWS HD; GERALDES CFGC; PINHEIRO TJT;
Indirizzi:
CTR FIS MAT CONDENSADA,AV GAMA PINTO 2 P-1699 LISBON PORTUGAL UNIV COIMBRA,DEPT QUIM & BIOQUIM P-3049 COIMBRA PORTUGAL
Titolo Testata:
Journal of the Chemical Society. Faraday transactions
fascicolo: 16, volume: 89, anno: 1993,
pagine: 3117 - 3122
SICI:
0956-5000(1993)89:16<3117:MNSOLS>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIELD-DEPENDENT RELAXATION; SPIN-LATTICE RELAXATION; MESOPHASE FORMATION; MOLTEN CARBOXYLATES; MICELLAR SOLUTIONS; NMR RELAXATION; C-13; DYNAMICS; SYSTEMS; PB-207;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
63
Recensione:
Indirizzi per estratti:
Citazione:
G. Feio et al., "MULTINUCLEAR NUCLEAR-MAGNETIC-RESONANCE, STUDIES OF LEAD(II) SOAPS .3. STUDIES ON THE LIQUID-PHASE WITH REFERENCE TO THE BEHAVIOR OF THE CORRESPONDING ACIDS", Journal of the Chemical Society. Faraday transactions, 89(16), 1993, pp. 3117-3122

Abstract

H-1 NMR spectra and longitudinal relaxation times have been measured for a number of even-chain-length lead(II) carboxylates and their corresponding acids in the liquid phase. Differences are observed, suggesting that aggregation occurs in the former case. Support for this comesfrom the greater spectral linewidths and shorter T1 values observed in the molten carboxylates. From analysis of longitudinal and transverse proton-relaxation rates, estimates are made of aggregate correlationtimes. From studies of the Pb-207 NMR longitudinal relaxation of molten lead(ii) decanoate at various field strengths it is suggested that the dominant relaxation mechanism involves chemical shift anisotropy. Using this data, information on aggregate motion and size is also obtained. C-13 NMR spectra and relaxation data have been studied for the lead(II) alkanoates and corresponding acids in the liquid phase and theresults support the idea of the existence of aggregates. Studies of the longitudinal C-13 relaxation of molten lead(II) octanoate at various magnetic field strengths provide further insight on these systems, and support the view that the liquid phase of the molten carboxylates consists of small aggregates.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 13:32:28