Homonuclear Vanadium-51 Dipolar Couplings in Inorganic Solids Obtained via Hahn Spin Echo Decay NMR Spectroscopy

Gee, Becky

doi:10.1006/snmr.2001.0023

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…2 are comparisons of the experimental normalized spin-echo intensities as a function of evolution period, 2t 1 , with the theoretical spin-echo response curves calculated according to Eqns (1) and (7) 14 there is a noticeable deviation of the normalized spin-echo intensities at relatively long evolution periods. It is possible that the deviation between the experimental and calculated echo responses at longer evolution periods arises from partial suppression of spin exchange among neighboring 27 Al nuclei.…”

Section: Analysis and Modeling Of The Present Data Crystalline Model mentioning

confidence: 99%

The aluminum ordering in aluminosilicates: a dipolar ²⁷Al NMR spectroscopy study

Gee¹

2003

Magnetic Reson in Chemistry

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The spatial ordering of aluminum atoms in CsAl(SiO3)2 and 3Al2O3.2SiO2 was probed by 27Al dipolar solid-state NMR spectroscopy. The 27Al response to a Hahn spin-echo pulse sequence in a series of aluminum-containing model crystalline compounds demonstrates that quantitative 27Al homonuclear dipolar second moments can be obtained to within +/-20% of the theoretical values, if evaluation of the spin-echo response curve is limited to short evolution periods (2t1 < or = 0.10 ms). Additionally, selective excitation of the central transition m = 1/2 --> -1/2 is necessary in order to ensure quantitative results. Restriction of spin exchange affecting the dephasing of the magnetization may decelerate the spin-echo decay at longer evolution periods. Considering these restraints, the method was used to probe the spatial distribution of aluminum atoms among the tetrahedral sites in two aluminosilicate materials. Experimental 27Al spin-echo response data for the aluminosilicates CsAl(SiO3)2 (synthetic pollucite) and 3Al2O3.2SiO2 (mullite) are compared with theoretical data based on (I) various degrees of aluminum-oxygen-aluminum bond formation among tetrahedrally coordinated aluminum atoms (Al(T(d) )-O-Al(T(d) )) and (II) the maximum avoidance of Al(T(d) )-O-Al(T(d) ) bonding. Analysis of the second moment values and resulting echo decay responses suggests that partial suppression of spin exchange among aluminum atoms in crystallographically distinct sites may contribute to the 27Al spin echo decay in 3Al2O3.2SiO2, thus complicating quantitative analysis of the data. Silicon-29 and aluminum-27 magic angle spinning (MAS) NMR spectra of 3Al2O3.2SiO2 are consistent with those previously reported. The experimental 27Al spin-echo response behavior of CsAl(SiO3)2 differs from the theoretical response behavior based on the maximum avoidance of Al-O-Al bonding between tetrahedral aluminum sites in CsAl(SiO3)2. A single unresolved resonance is observed in both the silicon-29 and aluminum-27 MAS spectra of CsAl(SiO3)2.

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Section: Analysis and Modeling Of The Present Data Crystalline Model mentioning

confidence: 99%

The aluminum ordering in aluminosilicates: a dipolar ²⁷Al NMR spectroscopy study

Gee¹

2003

Magnetic Reson in Chemistry

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Solid‐State NMR Studies on Precursor‐Derived Si‐B‐C‐N Ceramics

Tsetsgee

Müller

2010

Ceramic Transactions Series

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Versatility of the dipolar filter selection: From 1H nuclear spin diffusion experiment to the measurement of nuclear Overhauser effect in homopolymer melts

Gaborieau¹,

Graf²,

Spiess³

2005

Solid State Nuclear Magnetic Resonance

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Homonuclear Vanadium-51 Dipolar Couplings in Inorganic Solids Obtained via Hahn Spin Echo Decay NMR Spectroscopy

Cited by 4 publications

References 33 publications

The aluminum ordering in aluminosilicates: a dipolar ²⁷Al NMR spectroscopy study

The aluminum ordering in aluminosilicates: a dipolar ²⁷Al NMR spectroscopy study

Solid‐State NMR Studies on Precursor‐Derived Si‐B‐C‐N Ceramics

Versatility of the dipolar filter selection: From 1H nuclear spin diffusion experiment to the measurement of nuclear Overhauser effect in homopolymer melts

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Homonuclear Vanadium-51 Dipolar Couplings in Inorganic Solids Obtained via Hahn Spin Echo Decay NMR Spectroscopy

Cited by 4 publications

References 33 publications

The aluminum ordering in aluminosilicates: a dipolar 27Al NMR spectroscopy study

The aluminum ordering in aluminosilicates: a dipolar 27Al NMR spectroscopy study

Solid‐State NMR Studies on Precursor‐Derived Si‐B‐C‐N Ceramics

Versatility of the dipolar filter selection: From 1H nuclear spin diffusion experiment to the measurement of nuclear Overhauser effect in homopolymer melts

Contact Info

Product

Resources

About

The aluminum ordering in aluminosilicates: a dipolar ²⁷Al NMR spectroscopy study

The aluminum ordering in aluminosilicates: a dipolar ²⁷Al NMR spectroscopy study