Abstract
Double-quantum filtered MAS NMR spectra of an isolated homonuclear spin-1/2 pair are considered, at and away from rotational resonance conditions. The pulse sequence used is the solid-state NMR equivalent of double-quantum filtered COSY, known from solution-state NMR. The Sn-119 spin pair in [(chex(3)Sn)(2)S] is characterized by a difference in isotropic chemical shielding smaller than the two chemical shielding anisotropies and by direct dipolar and isotropic J-coupling constants of similar magnitudes. At rotational resonance, one-dimensional double-quantum filtered Sn-119 lineshapes yield the relative orientation of the two Sn-119 chemical shielding tensors. Good double-quantum filtration efficiencies are found at and away from rotational resonance conditions, despite the presence of large chemical shielding anisotropics. Numerical simulations illustrate the interplay of the direct dipolar and J-coupling pathways and identify the latter as the main pathway even at rotational resonance conditions. (C) 2002 Elsevier Science (USA).
| Original language | English |
|---|---|
| Pages (from-to) | 71-85 |
| Number of pages | 15 |
| Journal | SOLID STATE NUCLEAR MAGNETIC RESONANCE |
| Volume | 21 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 2002 |
Keywords
- rotational resonance
- double-quantum filtration
- numerical simulations
- direct dipolar and J coupling
- chemical shielding tensors
- NUCLEAR-MAGNETIC-RESONANCE
- SOLID-STATE NMR
- 3-DIMENSIONAL LATTICE CONNECTIVITIES
- CARBON-CARBON CONNECTIVITIES
- NATURAL-ABUNDANCE SAMPLES
- ROTATIONAL-RESONANCE
- HOMONUCLEAR
- SPECTROSCOPY
- INADEQUATE
- SIMULATIONS
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