Quadrupole coupling constant and chemical shift anisotropy

Quadrupole coupling constant and chemical shift anisotropy 

(26) does not hold in the systems of Co(III) porphyrinates, where the nonlocal contribution to the chemical shielding may be significant owing to the potential interaction between the metal valence electrons and the porphyrin 7T system.  

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Using a series of layered transition metal disulfides, Sutrisno et al. have demonstrated that the wide-line natural abimdance solid-state NMR spectra of in a less symmetric environment can readily be obtained at ultrahigh magnetic field of 21.1 T and that surprisingly these closely related materials display a wide range of quadrupole coupling constant and chemical shift anisotropy values. ... 

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