Temperature Dependence of the Nuclear Quadrupole Frequencies of 23Na and 187Re in NaReO4

Günther, S.; Lutz, O.; Nolle, A.; Schrade, P. G.

doi:10.1515/zna-1978-0904

Cited by 3 publications

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…35 Using our new NQR data, we establish that C Q ( 185 Re)=300.68(0.02) MHz and C Q ( 187 Re) = 284.54(0.02) MHz at 291.8 K. The slight discrepancy between our C Q ( 185/187 Re) values and those measured earlier by NQR can be fully attributed to the difference in the respective measurement temperatures. 36 To measure the rhenium EFG and CS tensors for this sample using SSNMR, we carried out 185/187 Re SSNMR experiments on powdered NaReO 4 at B 0 = 11.75 and 21.1 T ( Fig. 1 and 2).…”

Section: Experimental 1 Sample Preparationmentioning

confidence: 99%

Definitive solid-state 185/187Re NMR spectral evidence for and analysis of the origin of high-order quadrupole-induced effects for I = 5/2

Widdifield

Bain

Bryce

2011

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Rhenium-185/187 solid-state nuclear magnetic resonance (SSNMR) experiments using NaReO(4) and NH(4)ReO(4) powders provide unambiguous evidence for the existence of high-order quadrupole-induced effects (HOQIE) in SSNMR spectra. Fine structure, not predicted by second-order perturbation theory, has been observed in the (185/187)Re SSNMR spectrum of NaReO(4) at 11.75 T, where the ratio of the Larmor frequency (ν(0)) to the quadrupole frequency (ν(Q)) is ∼2.6. This is the first experimental observation that under static conditions, HOQIE can directly manifest in SSNMR powder patterns as additional fine structure. Using NMR simulation software which includes the quadrupole interaction (QI) exactly, extremely large (185/187)Re nuclear quadrupole coupling constants (C(Q)) are accurately determined. QI parameters are confirmed independently using solid-state (185/187)Re nuclear quadrupole resonance (NQR). We explain the spectral origin of the HOQIE and provide general guidelines that may be used to assess when HOQIE may impact the interpretation of the SSNMR powder pattern of any spin-5/2 nucleus in a large, axially symmetric electric field gradient (EFG). We also quantify the errors incurred when modeling SSNMR spectra for any spin-5/2 nucleus within an axial EFG using second-order perturbation theory. Lastly, we measure rhenium chemical shifts in the solid state for the first time.

show abstract

Section: Experimental 1 Sample Preparationmentioning

confidence: 99%