NMR studies of P-31, H-1 spin pairs in solid tin(II) phosphite and tin(II) hydrogen phosphate

Amornsakchai, P.; Hodgkinson, P.; Harris, R.K.

Abstract

We show how the spin dynamics in isolated spin systems presents both opportunities and complications, using the H-1, P-31 pair encountered in solid SnHPO3 and SnHPO4. Transient oscillations observed in the build-up of P-31 magnetization, during cross-polarization under moderately fast magic-angle spinning, allow us to measure P-31 and H-1 dipolar coupling constants. We show that this approach to determining internuclear distances (1.42 +/- 0.01 Angstrom for SnHPO3 and 2.05 +/- 10.03 Angstrom for SnHPO4) is particularly robust for strong dipolar couplings (of the order of the spin rate). These distances had not been determined in previous X-ray diffraction studies, due to the difficulty of locating the hydrogen atoms in the presence of Sn. We also show that the interaction of the P-31 shielding tensor, P-31, H-1 dipolar coupling and continuous-wave decoupling results in unusual line-splittings and broadenings in the {P-31}H-1 spectra. These effects are only partially suppressed by the use of more sophisticated decoupling methods.

Citation

Amornsakchai, P., Hodgkinson, P., & Harris, R. (2004). NMR studies of P-31, H-1 spin pairs in solid tin(II) phosphite and tin(II) hydrogen phosphate. Molecular Physics, 102(9-10), 877-882

• Journal Article Type: Article
• Publication Date: 2004-05
• Journal: Molecular Physics
• Print ISSN: 0026-8976
• Publisher: Taylor and Francis Group
• Peer Reviewed: Peer Reviewed
• Volume: 102
• Issue: 9-10
• Pages: 877-882