Optimal 2H rf Pulses and 2H–13C Cross-Polarization Methods for Solid-State 2H MAS NMR of Perdeuterated Proteins

2011 ◽  
Vol 2 (11) ◽  
pp. 1289-1294 ◽  
Author(s):  
Daxiu Wei ◽  
Ümit Akbey ◽  
Berit Paaske ◽  
Hartmut Oschkinat ◽  
Bernd Reif ◽  
...  
Keyword(s):  
Solid State ◽  
Mas Nmr ◽  
Cross Polarization ◽  
Rf Pulses ◽  
Perdeuterated Proteins

A Combination of Slow and Fast RF Field Modulation for Improved Cross Polarization in Solid-State MAS NMR

1997 ◽  
Vol 125 (2) ◽  
pp. 291-301 ◽  
Author(s):  
S. Hediger ◽  
P. Signer ◽  
M. Tomaselli ◽  
R.R. Ernst ◽  
B.H. Meier
Keyword(s):  
Solid State ◽  
Mas Nmr ◽  
Cross Polarization ◽  
Field Modulation

Solid-State Heteronuclear-Correlation NMR Studies of Multicomponent Phosphate Glasses

1998 ◽  
Vol 547 ◽  
Author(s):  
S. Prabakar ◽  
J.M. Egan ◽  
R.M. Wenslow ◽  
K.T. Mueller
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Phosphate Glasses ◽  
Mas Nmr ◽  
Quadrupolar Nuclei ◽  
Sodium Ions ◽  
Cross Polarization ◽  
Nmr Studies ◽  
Heteronuclear Correlation ◽  
Aluminophosphate Glasses

AbstractThe correlation between 23Na and 31P nuclei in alkali phosphates has been investigated by cross-polarization MAS NMR spectroscopy. Connectivity between sodium ions with various phosphorus tetrahedra has been demonstrated in a variety of crystalline-and amorphous alkali phosphates. CPMAS NMR experiments were also performed on sodium aluminophosphate glasses from both quadrupolar nuclei (23Na and 27Al) to the phosphorus nuclei to establish connectivity of sodium and phosphorus as well as aluminum and phosphorus nuclei in these systems.

scholarly journals Dual-band selective double cross polarization for heteronuclear polarization transfer between dilute spins in solid-state MAS NMR

2012 ◽  
Vol 217 ◽  
pp. 92-99 ◽  
Author(s):  
Zhengfeng Zhang ◽  
Yimin Miao ◽  
Xiaoli Liu ◽  
Jun Yang ◽  
Conggang Li ◽  
...  
Keyword(s):  
Solid State ◽  
Polarization Transfer ◽  
Mas Nmr ◽  
Dual Band ◽  
Cross Polarization ◽  
Double Cross

Determination of the location of naphthalene in the zeolite ZSM-5 host framework by solid-state 1H/29Si CP MAS NMR spectroscopy

2006 ◽  
Vol 84 (2) ◽  
pp. 345-355 ◽  
Author(s):  
Colin A Fyfe ◽  
Darren H Brouwer
Keyword(s):  
Solid State ◽  
Structure Determination ◽  
Dipolar Coupling ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Magic Angle ◽  
Cross Polarization ◽  
Nmr Structure Determination ◽  
Nmr Data ◽  
Angle Spinning

The location of naphthalene in the zeolite ZSM-5 has been determined from solid-state 1H/29Si cross-polarization (CP) magic-angle-spinning (MAS) NMR data alone. With the peaks in the 29Si spectrum assigned to the inequivalent Si sites in the zeolite from a two-dimensional INADEQUATE spectrum, the rates of cross polarization between the 1H nuclei of the guest sorbate molecules and the 29Si nuclei of the zeolite framework were used to determine the location of the naphthalene molecules by exploiting the proportional relationship between cross-polarization rate constants and 1H/29Si dipolar coupling second moments. The NMR structure determination was carried out on three different selectively deuterium-labeled naphthalene molecules (naphthalene-d0, α-naphthalene-d4, and β-naphthalene-d4). The average of the molecule locations in agreement with all three sets of NMR data was found to be in excellent agreement with an existing single crystal XRD structure of the naphthalene–ZSM-5 complex.Key words: solid-state NMR, cross polarization, zeolites, host–guest complexes, structure determination.

The Nature of Chemisorbed CO2 in Zeolite A

2019 ◽  
Author(s):  
Przemyslaw Rzepka ◽  
Zoltán Bacsik ◽  
Andrew J. Pell ◽  
Niklas Hedin ◽  
Aleksander Jaworski
Keyword(s):  
Solid State ◽  
Ir Spectroscopy ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Surface Coverage ◽  
Gas Mixtures ◽  
Mas Nmr ◽  
Significant Fraction ◽  
Zeolite A

Formation of CO<sub>3</sub><sup>2-</sup> and HCO<sub>3</sub><sup>-</sup> species without participation of the framework oxygen atoms upon chemisorption of CO<sub>2</sub> in zeolite |Na<sub>12</sub>|-A is revealed. The transfer of O and H atoms is very likely to have proceeded via the involvement of residual H<sub>2</sub>O or acid groups. A combined study by solid-state <sup>13</sup>C MAS NMR, quantum chemical calculations, and <i>in situ</i> IR spectroscopy showed that the chemisorption mainly occurred by the formation of HCO<sub>3</sub><sup>-</sup>. However, at a low surface coverage of physisorbed and acidic CO<sub>2</sub>, a significant fraction of the HCO<sub>3</sub><sup>-</sup> was deprotonated and transformed into CO<sub>3</sub><sup>2-</sup>. We expect that similar chemisorption of CO<sub>2</sub> would occur for low-silica zeolites and other basic silicates of interest for the capture of CO<sub>2</sub> from gas mixtures.

scholarly journals Combination of solid state NMR and DFT calculation to elucidate the state of sodium in hard carbon electrodes

2016 ◽  
Vol 4 (34) ◽  
pp. 13183-13193 ◽  
Author(s):  
Ryohei Morita ◽  
Kazuma Gotoh ◽  
Mika Fukunishi ◽  
Kei Kubota ◽  
Shinichi Komaba ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Dft Calculation ◽  
Magic Angle Spinning ◽  
The State ◽  
Mas Nmr ◽  
Magic Angle ◽  
Multiple Quantum ◽  
Hard Carbon ◽  
Angle Spinning

We examined the state of sodium electrochemically inserted in HC prepared at 700–2000 °C using solid state Na magic angle spinning (MAS) NMR and multiple quantum (MQ) MAS NMR.

Investigating Sorption on Iron−Oxyhydroxide Soil Minerals by Solid-State NMR Spectroscopy:  A6Li MAS NMR Study of Adsorption and Absorption on Goethite

2005 ◽  
Vol 109 (39) ◽  
pp. 18310-18315 ◽  
Author(s):  
Ulla Gro Nielsen ◽  
Younkee Paik ◽  
Keinia Julmis ◽  
Martin A. A. Schoonen ◽  
Richard J. Reeder ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Mas Nmr ◽  
Iron Oxyhydroxide ◽  
Soil Minerals ◽  
Solid State Nmr Spectroscopy ◽  
Nmr Study
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