Very high-resolution MAS NMR of a natural polymeric material

Autor:	M. H. Lopes, João Rocha, C. Pascoal Neto, Ana M. Gil
Rok vydání:	1999
Předmět:	Nuclear and High Energy Physics Radiation Proton Chemistry Carbon-13 NMR satellite Chemical shift Relaxation (NMR) Analytical chemistry General Chemistry Carbon-13 NMR Spectral line Proton NMR Magic angle spinning Condensed Matter::Strongly Correlated Electrons Instrumentation
Zdroj:	Solid State Nuclear Magnetic Resonance. 15:59-67
ISSN:	0926-2040
DOI:	10.1016/s0926-2040(99)00047-8
Popis:	The use of ultrafast magic angle spinning (>30 kHz) in tandem with delayed echo acquisition is shown to yield very high-resolution 1 H MAS NMR spectra of complex natural organic materials. For the first time, very high-resolution 1 H MAS NMR spectra are reported for cork and wood components, two natural materials with great economic importance. The effect of the spinning rate on the 1 H NMR spectra was evaluated with single-pulse acquisition and delayed-echo acquisition. The delayed-echo acquisition spectra presented linewidths as sharp as 67 and 25 Hz. The narrow peaks, characterised by proton spin–spin and spin–lattice relaxation, were assigned to the isotropic chemical shifts and the general spectral features were shown to correlate with the sample chemical structure. The tentative assignments of cork 1 H MAS NMR signals were presented.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5303fe235be488d1c191c8d3c4aa0e04 https://doi.org/10.1016/s0926-2040(99)00047-8 Zobrazit plný text záznamu Full Text from ScienceDirect