Sodium isotropic chemical shifts

Fig. 3 Solid state 31P NMR spectra of fosinopril sodium acquired under single pulse, high-power proton decoupling and various conditions of magic-angle spinning (A) static, (B) 2.5 kHz, (C) 4.0 kHz, (D) 5.0 kHz, and (E) 6.0 kHz. The isotropic chemical shift is designated by an asterisk. (From Ref. 15.)...

Figure 7.8. A. two-dimensional DAS spectrum of glassy Na2Te409 acquired at a magnetic field of 8.46 T at spinning speeds of 5.5-6.0 kHz and rotor angles of 37.38° and 79.19° to the magnetic field. The maximum of the peak projection onto the isotropic shift axis is taken as the most probable isotropic shift. Note that the shifts are referenced to solid NaCl. B. Variation with glass composition of the most probable isotropic chemical shifts at two magnetic fields deduced from the DAS spectra of sodium tellurite glasses (referenced to solid NaCI). From Tagg et al.

The paramagnetic effects of oxygen molecules on the sodium cations in zeolite LiNaX (approximate to 70% Li 30% Na) have been investigated using VT Na MAS NMR and Na MQ MAS NMR. 23 jyjg been used to calculate the isotropic chemical shifts, quadrupolar shifts, and the quadrupolar coupling constants. 

Table 3. Quadrupole coupling constants, Cq, asymmetry parameters, 7]q, and isotropic chemical shifts, 5, (referenced to solid NaCl) of sodium cations in dehydrated zeolites NaY and NaX calculated by a point charge model (see text) and experimentally derived by solid-state Na MAS NMR spectroscopy [194,201,203] ...

Figure 11. 23Na chemical shifts (in ppm) for isotropic solutions of sodium octanoate (X) and sodium octylsul-fate (O) as a function of the inverse soap concentration. 

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