Olivieri A C
Departamento de Química Analítica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Rosario, Argentina.
Solid State Nucl Magn Reson. 1993 Mar;1(6):345-53. doi: 10.1016/0926-2040(93)90016-g.
A simple approach is discussed for studying the effect of quadrupolar nuclei on the magic-angle-spinning solid-state NMR lines of spin-1/2 nuclei in the limit of large quadrupole coupling constants. Equations are derived both for the isotropic shifts and the Pake-like powder patterns for any quadrupolar spin and for arbitrary orientations of the internuclear vector with respect to the unique axis of an axially symmetric quadrupole tensor. First-order effects due to a small Zeeman perturbation on these lines are explored, as well as deviations from axial symmetry in the electric field gradient when S = 3/2 quadrupolar nuclei are involved. Spectral parameters likely to be observed in the case of coupling between 31P and 201Hg are also discussed.
讨论了一种简单方法，用于在大四极耦合常数的极限情况下研究四极核自旋对1/2自旋核魔角旋转固态核磁共振谱线的影响。针对任意四极自旋以及核间矢量相对于轴对称四极张量唯一轴的任意取向，推导了各向同性位移和类帕克粉末图案的方程。探讨了小塞曼微扰对这些谱线的一阶效应，以及涉及S = 3/2四极核时电场梯度偏离轴对称的情况。还讨论了在31P和201Hg耦合情况下可能观测到的光谱参数。
