Spin diffusion in the Phosphorus-31 NMR relaxation in a layered crystalline α-Sn(IV) phosphate contaminated by paramagnetic impurities

Vladimir I Bakhmutov; Douglas W Elliott; Nattamai Bhuvanesh; Hong-Cai Zhou

doi:10.1016/j.ssnmr.2023.101875

Spin diffusion in the Phosphorus-31 NMR relaxation in a layered crystalline α-Sn(IV) phosphate contaminated by paramagnetic impurities

Solid State Nucl Magn Reson. 2023 Aug:126:101875. doi: 10.1016/j.ssnmr.2023.101875. Epub 2023 Jun 5.

Authors

Vladimir I Bakhmutov¹, Douglas W Elliott², Nattamai Bhuvanesh², Hong-Cai Zhou³

Affiliations

¹ Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA. Electronic address: [email protected].
² Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA.
³ Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA; Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843-3003, USA.

PMID: 37301019
DOI: 10.1016/j.ssnmr.2023.101875

Abstract

The study of a layered crystalline Sn(IV) phosphate by solid-state NMR has demonstrated that the ³¹P T₁ relaxation of phosphate groups, dependent on spinning rate is completely controlled by the limited spin diffusion to paramagnetic ions found by EPR. The spin-diffusion constant, D(SD), was estimated as 2.04 10^-14 cm²s^-1. The conclusion was supported by the ³¹P T₁ time measurements in zirconium phosphate 1-1, also showing paramagnetic ions and in diamagnetic compound (NH₄)₂HPO₄.

Keywords: (1)H MAS NMR; (31)P; Metal phosphates; Mobility; Relaxation times.