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Related Experiment Videos

Relationship between Solid State NMR Parameters and X-ray Structural Data in Tricadmium Phosphates.

S. Aime1, G. Digilio, R. Gobetto

  • 1Centro di studio per la Fisica delle Macromolecole (CNR), c/o Dipartimento di Chimica "G. Ciamician", Università di Bologna, Via Selmi 2, 40126, Bologna, Italy.

Inorganic Chemistry
|January 3, 1996
PubMed
Summary

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Solid-state Nuclear Magnetic Resonance (NMR) and X-ray diffraction reveal detailed structural insights into beta-tricadmium phosphate (beta-TCdP). Magnesium substitution was found to randomly distribute, decreasing structural order.

Area of Science:

  • Solid-state Chemistry
  • Materials Science
  • Crystallography

Background:

  • Beta-tricadmium phosphate (beta-TCdP) is a crystalline material with complex structural characteristics.
  • Understanding the local atomic environment and coordination in beta-TCdP is crucial for its potential applications.
  • Nuclear Magnetic Resonance (NMR) spectroscopy and X-ray diffraction are powerful tools for probing solid-state structures.

Purpose of the Study:

  • To elucidate the crystallographic sites and local atomic environments in beta-tricadmium phosphate (beta-TCdP) using advanced spectroscopic techniques.
  • To assign specific NMR resonances to distinct crystallographic sites within the beta-TCdP unit cell.
  • To investigate the structural impact of magnesium substitution for cadmium in beta-TCdP.

Main Methods:

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  • Solid-state Magic Angle Spinning (MAS) NMR spectroscopy, specifically using Phosphorus-31 (31P) and Cadmium-113 (113Cd) nuclei.
  • X-ray diffraction (XRD) for crystallographic analysis.
  • Computational methods to correlate bond strengths with NMR chemical shifts.

Main Results:

  • High-resolution 31P and 113Cd MAS NMR spectra were obtained, showing resonances consistent with crystallographically independent sites.
  • A correlation between 31P chemical shifts and crystallographic sites was established by calculating bond strengths.
  • 113Cd NMR resonance assignments were achieved by relating chemical shift tensor asymmetry to coordination geometry distortions.
  • Magnesium substitution for cadmium was found to occur randomly, leading to a significant reduction in structural order.

Conclusions:

  • The study successfully assigned 31P and 113Cd NMR signals to specific crystallographic sites in beta-TCdP.
  • The findings provide a detailed understanding of the local atomic environments and coordination in beta-TCdP.
  • Magnesium incorporation disrupts the ordered structure of beta-TCdP, highlighting the sensitivity of the material to compositional changes.