Title: Residual chemical-shift effects in spin-echo NMR powder patterns of homonuclear dipolar-coupled spins
Abstract: The effect of the spin-echo pulse sequence on homonuclear dipolar-coupled spins in solids has been studied. Precise analysis has revealed that the sequence may not yield simple Pake doublets but rather complicated patterns because of the imperfect refocusing of the chemical shifts. This strong-coupling effect has been verified experimentally through the measurement of the 31P two-dimensional spin-echo powder pattern for polycrystalline tetraphenyldiphosphine; our choice of tetraphenyldiphosphine was fortunate because it transpired that the non-parallel chemical-shift tensors of the two 31P nuclei in the compound yield the desired residual chemical-shift effects.
Publication Year: 1994
Publication Date: 1994-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 15
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