ChemInform Abstract: Solid-State NMR Techniques in Oriented Systems

ChemInform ◽  
2010 ◽  
Vol 23 (43) ◽  
pp. no-no
Author(s):  
K. V. RAMANATHAN ◽  
B. S. ARUNKUMAR ◽  
N. SURYAPRAKASH ◽  
R. PRATIMA ◽  
C. L. KHETRAPAL
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Techniques

Suitability of Different 13C Solid-state NMR Techniques in the Characterization of Humic Acids

2002 ◽  
Vol 82 (4) ◽  
pp. 183-196 ◽  
Author(s):  
Jingdong Mao ◽  
Weiguo Hu ◽  
Guangwei Ding ◽  
Klaus Schmidt-Rohr ◽  
Geoffrey Davies ◽  
...  
Keyword(s):  
Solid State ◽  
Humic Acids ◽  
Solid State Nmr ◽  
Nmr Techniques

scholarly journals Solid-State NMR Techniques for the Structural Characterization of Cyclic Aggregates Based on Borane–Phosphane Frustrated Lewis Pairs

Molecules ◽  
2020 ◽  
Vol 25 (6) ◽  
pp. 1400 ◽  
Author(s):  
Robert Knitsch ◽  
Melanie Brinkkötter ◽  
Thomas Wiegand ◽  
Gerald Kehr ◽  
Gerhard Erker ◽  
...  
Keyword(s):  
Solid State ◽  
Structural Characterization ◽  
Solid State Nmr ◽  
Magic Angle ◽  
Frustrated Lewis Pairs ◽  
Wide Range ◽  
Nmr Techniques ◽  
Nmr Methods ◽  
Lewis Pairs

Modern solid-state NMR techniques offer a wide range of opportunities for the structural characterization of frustrated Lewis pairs (FLPs), their aggregates, and the products of cooperative addition reactions at their two Lewis centers. This information is extremely valuable for materials that elude structural characterization by X-ray diffraction because of their nanocrystalline or amorphous character, (pseudo-)polymorphism, or other types of disordering phenomena inherent in the solid state. Aside from simple chemical shift measurements using single-pulse or cross-polarization/magic-angle spinning NMR detection techniques, the availability of advanced multidimensional and double-resonance NMR methods greatly deepened the informational content of these experiments. In particular, methods quantifying the magnetic dipole–dipole interaction strengths and indirect spin–spin interactions prove useful for the measurement of intermolecular association, connectivity, assessment of FLP–ligand distributions, and the stereochemistry of adducts. The present review illustrates several important solid-state NMR methods with some insightful applications to open questions in FLP chemistry, with a particular focus on supramolecular associates.

scholarly journals Probing the interaction of U(vi) with phosphonate-functionalized mesoporous silica using solid-state NMR spectroscopy

2016 ◽  
Vol 45 (25) ◽  
pp. 10447-10458 ◽  
Author(s):  
Eva C. Uribe ◽  
Harris E. Mason ◽  
Jennifer A. Shusterman ◽  
Anthony Bruchet ◽  
Heino Nitsche
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Mesoporous Silica ◽  
Solid State Nmr ◽  
Solid State Nmr Spectroscopy ◽  
Functionalized Mesoporous Silica ◽  
Nmr Techniques ◽  
Contact Experiments

Solid-state NMR techniques combined with batch contact experiments elucidate how U(vi) binds to phosphonate-functionalized mesoporous silica.

Solid State NMR Studies of the Adsorbed States of Formic Acid on Y Zeolites

1980 ◽  
Vol 3 ◽  
Author(s):  
T. Michael Duncan ◽  
Robert W. Vaughan
Keyword(s):  
Solid State ◽  
Formic Acid ◽  
Solid State Nmr ◽  
Double Resonance ◽  
Chemical Shift Anisotropy ◽  
Surface States ◽  
Cross Polarization ◽  
Nmr Studies ◽  
Y Zeolites ◽  
Nmr Techniques

ABSTRACTSeveral multiple-pulse double-resonance NMR techniques have been applied to isolate and characterize the spectra of the adsorbed states of formic acid on two Y zeolites. The two surface states, bidentatT3 and ynidentate, possess different motional properties and 13C - H cross-polarization techniques may be used to separate the spectra. The 13C chemical shift anisotropy is founa to iorrelate with the symmetry of the formate species. The H spectrum of the carbonyl hydrogen, selectively observed with the dipolardifference method, indicates that this hydrogen becomes more acidic upon adsorption.

A DNP-supported solid-state NMR study of carbon species in fluid catalytic cracking catalysts

2017 ◽  
Vol 53 (28) ◽  
pp. 3933-3936 ◽  
Author(s):  
Deni Mance ◽  
Johan van der Zwan ◽  
Marjolein E. Z. Velthoen ◽  
Florian Meirer ◽  
Bert M. Weckhuysen ◽  
...  
Keyword(s):  
Solid State ◽  
Catalytic Cracking ◽  
Solid State Nmr ◽  
Fluid Catalytic Cracking ◽  
Carbon Deposits ◽  
Carbon Species ◽  
Nmr Study ◽  
Nmr Techniques ◽  
Cracking Catalysts

Solid-state NMR techniques supported by EPR and SEM-EDX enable spatial speciation of carbon deposits in commercial fluid catalytic cracking catalysts.

Modern solid state NMR techniques and concepts in structural studies of synthetic polymers

2016 ◽  
Vol 27 (9) ◽  
pp. 1143-1155 ◽  
Author(s):  
S. Kaźmierski ◽  
T. Pawlak ◽  
A. Jeziorna ◽  
M. J. Potrzebowski
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Synthetic Polymers ◽  
Structural Studies ◽  
Nmr Techniques

Efficiency of dipolar and J-derived solid-state NMR techniques for a new pair of nuclei {31P,29Si}. Towards the characterization of Si–O–P mesoporous materials

2008 ◽  
Vol 11 (4-5) ◽  
pp. 387-397 ◽  
Author(s):  
Cristina Coelho ◽  
Thierry Azais ◽  
Christian Bonhomme ◽  
Laure Bonhomme-Coury ◽  
Cédric Boissière ◽  
...  
Keyword(s):  
Solid State ◽  
Mesoporous Materials ◽  
Solid State Nmr ◽  
Nmr Techniques

Advanced Solid State NMR Techniques for the Investigation of the Organic-Mineral Interfaces in Biomaterials

2009 ◽  
Vol 1236 ◽  
Author(s):  
Danielle Laurencin ◽  
Gilles Guerrero ◽  
Julien Amalric ◽  
Christian Bonhomme ◽  
Christel Gervais ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Calcium Phosphates ◽  
Titanium Implants ◽  
Phosphonic Acids ◽  
Oh Groups ◽  
Organic Mineral ◽  
Nmr Techniques ◽  
Mineral Interfaces ◽  
Interface Structures

AbstractHigh resolution solid state NMR experiments were carried out on several compounds, to see how this technique can now be used to investigate in detail the surface structure of different biomaterials. First, because the surface of titanium implants can be functionalized by phosphonic acids, for instance to prevent bacterial adhesion,17O NMR experiments were performed on model TiO2 surfaces functionalized by 17O enriched phosphonic acids, to look at the mode of grafting of these coupling agents. Results bring clear evidence of the formation of Ti-O-P bridges and of the presence of residual P=O and P-OH groups. Second, given that calcium phosphates are widely present in biological hard tissues and synthetic biomaterials, 43Ca correlation experiments were performed on 43Ca enriched materials (hydroxyapatite and calcium benzoate), to see how the proximities between this nucleus and neighbouring atoms can be analyzed. Results show that both Ca…C and Ca…H proximities can be evidenced, and could thus help elucidate interface structures. All in all, these studies should pave the way to future investigations of biomaterials, and in particular of the structure of organic-inorganic interfaces.

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