PROTON CHEMICAL-SHIFT ANISOTROPIES MEASURED FROM TRANSIENT MULTISPIN ORDER

Due to the small chemical shift range and the large dipole moment of protonium, accurate determination of proton chemical shift anisotropies in isotropic fluids is difficult. However, since shift anisotropy and dipolar interactions are temporally correlated, one can probe the electronic shielding tensor with a sensitivity commonly associated with the magnetic dipole-dipole interaction. The unique signature of temporal correlation is transient multispin order. This signature is apparent when one-spin order is sequestered. Pertinent equations and potential methodologies are derived/described. © 1990 American Chemical Society.