The measurement of 13C chemical-shift tensors (CSTs) of polycyclic aromatic hydrocarbons (PAHs) has received considerable attention in recent years.1-7 Challenges to measuring CSTs in aromatic microcrystalline powders include spectral complexity due to the spinning sideband patterns, the relatively close isotropic chemical shifts of the various carbons in the molecule (typically 120-140 ppm), and coincidental overlap of equivalent molecular positions in crystallographically inequivalent sites. Spectral complexity is reduced in this work by application of the FIREMAT experiment, a two-dimensional (2D) magic angle turning (MAT) experiment that isolates individual sideband patterns associated with different isotropic chemical shifts.8 Recent advances in such methods have made possible the isolation of several dozen sideband patterns from a composite spectrum.
Revised: October 25, 2005 |
Published: June 18, 2002
Citation
Barich D.H., J. Hu, R.J. Pugmire, and D.M. Grant. 2002.Carbon-13 Chemical-Shift Tensors in Polycyclic Aromatic Compounds: Fluoranthene and Decacyclene.Journal of Physical Chemistry A 106.PNNL-SA-45310.