Solid-state NMR studies of some tin(II) compounds.

Area of Science:

• Solid-state inorganic chemistry
• Nuclear Magnetic Resonance (NMR) spectroscopy
• Materials science

Background:

• Tin(II) compounds exhibit diverse structural and electronic properties.
• Understanding solid-state interactions is crucial for materials development.
• Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful tool for characterizing solid materials.

Purpose of the Study:

• To investigate the solid-state NMR spectra of tin(II) phosphite (SnHPO3) and tin(II) phosphate (SnHPO4).
• To determine tin-tin coupling constants and shielding tensor parameters.
• To correlate NMR findings with the crystal structures of these tin(II) compounds.

Main Methods:

• High-resolution solid-state Nuclear Magnetic Resonance (NMR) spectroscopy, specifically using (119)Sn and (31)P nuclei.
• Magic Angle Spinning (MAS) NMR techniques.
• Spinning sideband analysis and Hahn echo experiments to analyze shielding tensors and coupling constants.

Main Results:

• High-resolution (119)Sn and (31)P NMR spectra were obtained for SnHPO3 and SnHPO4.
• Unusually large indirect (119)Sn-(117)Sn coupling constants were measured: 2600±200 Hz for SnHPO3 and 4150±200 Hz for SnHPO4.
• Satellite peak analysis indicated intra-layer coupling in SnHPO3 and inter-layer coupling in SnHPO4.
• Shielding tensor data were also reported for other tin(II) compounds.

Conclusions:

• The study provides detailed solid-state NMR characterization of tin(II) phosphite and tin(II) phosphate.
• The determined tin-tin coupling constants offer insights into bonding and structural arrangements.
• NMR data are consistent with the crystal structures, differentiating between intra- and inter-layer coupling mechanisms.