Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Double-quantum-filtered rotational-resonance MAS NMR in the presence of large chemical shielding anisotropies
Autore:
Bechmann, M; Helluy, X; Sebald, A;
Indirizzi:
Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany Univ Bayreuth Bayreuth Germany D-95440 eoinst, D-95440 Bayreuth, Germany
Titolo Testata:
JOURNAL OF MAGNETIC RESONANCE
fascicolo: 1, volume: 152, anno: 2001,
pagine: 14 - 25
SICI:
1090-7807(200109)152:1<14:DRMNIT>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR-MAGNETIC-RESONANCE; SOLID-STATE NMR; HOMONUCLEAR 2-SPIN SYSTEMS; FLOQUET THEORY; SPIN PAIRS; NUMERICAL-SIMULATION; DIPOLAR; SPECTRA; ACID; ORIENTATIONS;
Keywords:
MAS NMR; rotational resonance; double-quantum filtration; numerical simulations; C-13 spin systems; chemical shielding tensors;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Sebald, A Univ Bayreuth, Bayer Geoinst, POB 101251, D-95440 Bayreuth, Germany Univ Bayreuth POB 101251 Bayreuth Germany D-95440 euth, Germany
Citazione:
M. Bechmann et al., "Double-quantum-filtered rotational-resonance MAS NMR in the presence of large chemical shielding anisotropies", J MAGN RES, 152(1), 2001, pp. 14-25

Abstract

Double-quantum filtration under rotational resonance MAS NMR conditions where the chemical shielding anisotropies involved exceed the differences in isotropic chemical shielding is considered by means of numerical simulations and C-13 MAS NMR experiments. The responses of two different pulse sequences, suitable for double-quantum filtration specifically under rotational resonance conditions, to large chemical shielding anisotropies are compared. In the presence of large chemical shielding anisotropies a very recently introduced pulse sequence (T. Karlsson, M. Eden, H. Luthman, and M. H. Levitt, J. Magn. Reson. 145, 95-107, 2000) suffers losses in double-quantum-filtration efficiencies. The double-quantum-filtration efficiency of another pulse sequence (N. C. Nielsen, F. Creuzet, R. G. Griffin, and M. H. Levitt, J. Chem. Phys. 96, 5668-5677, 1992) is less afflicted by the presence of large chemical shielding anisotropies. Both sequences deliver double-quantum-filtered lineshapes that sensitively reflect chemical shielding tensor orientations. It is further shown that double-quantum-filtered rotational-resonance lineshapes of spin systems composed of more than two spins offer a suitable experimental approach for determining chemical shielding tensor orientations for cases where conventional rotational-resonance experiments are not applicable due to the presence of additional background resonances. (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 23:55:59