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High‐Resolution Solid‐State MAS 13 C‐ and 1 H‐NMR Spectra of Benzenoid Aromatics Adsorbed on Alumina and Silica: Successful Applications of 1D and 2D Pulse Experiments from Liquid‐State NMR
Author(s) -
Ebener Michael,
Fircks Gero Von,
Günther Harald
Publication year - 1991
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19910740619
Subject(s) - homonuclear molecule , chemistry , nmr spectra database , spectral line , solid state nuclear magnetic resonance , magic angle spinning , magic angle , analytical chemistry (journal) , carbon 13 nmr satellite , high resolution , nuclear magnetic resonance spectroscopy , solid state , crystallography , nuclear magnetic resonance , molecule , stereochemistry , fluorine 19 nmr , organic chemistry , physics , remote sensing , geology , astronomy
Abstract Strong line‐narrowing effects in solid‐state, magic‐angle‐spinning (MAS) 13 C‐ as well as 1 H‐NMR spectra of benzenoid aromatics adsorbed at alumina or silica surfAccs indicate high mobility of the organic adsorbates. Even under modest spinning rales (1 kHz), dipolar couplings are sufficiently reduced to allow scalar 13C , 1 H couplings to be measured. Hetero‐ and homonuclear pulse sequences known from high‐resolution NMR in liquids, like SEFT, J ‐RESOLVED, DEPT, COSY, and 13 C, 1 H shift‐correlation experiments are successfully applicable. 13 C spin‐lattice relaxation limes are as short as 0.5 s (CH) and 1.1 s (C q ), and T 1 ( 1 H) values are in the order of 0.3 s.