Understanding the nature of active sites in metal-supported catalysts is of great importance towards establishing their structure–property relationships. The outstanding catalytic performance of metal-supported catalysts is frequently ascribed to the synergic effect of different active sites, which is however not well spectroscopically characterized. Herein, we report the direct detection of surface Zn species and 1H–67Zn internuclear interaction between Zn2+ ions and Brønsted acid sites on Zn-modified ZSM-5 zeolites by high-field solid-state NMR spectroscopy. The observed promotion of C-H bond activation of methane is rationalized by the enhanced Brønsted acidity generated by synergic effects arising from the spatial proximity/interaction between Zn2+ ions and Brønsted acidic protons. The concentration of synergic active sites is determined by 1H–67Zn double-resonance solid-state NMR spectroscopy.Together forever: High-field 67Zn solid-state NMR spectroscopy reveals the synergy between active sites in Zn-modified ZSM-5 zeolites. The internuclear spatial proximity/interaction between Zn2+ ions and Brønsted acid sites of the zeolites leads to a synergic effect in the C-H bond activation of methane.
[NMR paper] Cellulose Structural Polymorphism in Plant Primary Cell Walls Investigated by High-Field 2D Solid-State NMR Spectroscopy and Density Functional Theory Calculations.
Cellulose Structural Polymorphism in Plant Primary Cell Walls Investigated by High-Field 2D Solid-State NMR Spectroscopy and Density Functional Theory Calculations.
Cellulose Structural Polymorphism in Plant Primary Cell Walls Investigated by High-Field 2D Solid-State NMR Spectroscopy and Density Functional Theory Calculations.
Biomacromolecules. 2016 May 18;
Authors: Wang T, Yang H, Kubicki JD, Hong M
Abstract
The native cellulose of bacterial, algal, and animal origins has been well studied structurally using X-ray and neutron...
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05-19-2016 10:13 AM
Site-Specific Protein Internal Motions Revealed by 2H Solid-State NMR Spectroscopy
Site-Specific Protein Internal Motions Revealed by 2H Solid-State NMR Spectroscopy
Publication date: 16 February 2016
Source:Biophysical Journal, Volume 110, Issue 3, Supplement 1</br>
Author(s): Xiangyan Shi, Deborah A. Berthold, Chad M. Rienstra</br>
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[NMR paper] Proton-Detected Solid-State NMR Spectroscopy at Aliphatic Sites: Application to Crystalline Systems.
Proton-Detected Solid-State NMR Spectroscopy at Aliphatic Sites: Application to Crystalline Systems.
Related Articles Proton-Detected Solid-State NMR Spectroscopy at Aliphatic Sites: Application to Crystalline Systems.
Acc Chem Res. 2013 Jun 7;
Authors: Asami S, Reif B
Abstract
When applied to biomolecules, solid-state NMR suffers from low sensitivity and resolution. The major obstacle to applying proton detection in the solid state is the proton dipolar network, and deuteration can help avoid this problem. In the past, researchers...
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06-12-2013 11:42 AM
The interplay between the solid effect and the cross effect mechanisms in solid state 13C DNP at 95 GHz using trityl radicals
From The DNP-NMR Blog:
The interplay between the solid effect and the cross effect mechanisms in solid state 13C DNP at 95 GHz using trityl radicals
Banerjee, D., et al., The interplay between the solid effect and the cross effect mechanisms in solid state 13C DNP at 95 GHz using trityl radicals. J. Magn. Reson., 2013. 230(0): p. 212-219.
http://dx.doi.org/10.1016/j.jmr.2013.02.010
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05-07-2013 12:31 AM
[NMR paper] Nutrient-dependent structural changes in S. aureus peptidoglycan revealed by solid-state NMR spectroscopy.
Nutrient-dependent structural changes in S. aureus peptidoglycan revealed by solid-state NMR spectroscopy.
http://www.bionmr.com//www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--pubs.acs.org-images-pubmed-acspubs.jpg Related Articles Nutrient-dependent structural changes in S. aureus peptidoglycan revealed by solid-state NMR spectroscopy.
Biochemistry. 2012 Oct 16;51(41):8143-53
Authors: Zhou X, Cegelski L
Abstract
The bacterial cell wall is essential to cell survival and is a major target of antibiotics. The main component of the...
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04-02-2013 07:23 PM
Nutrient-Dependent StructuralChanges in S.aureus Peptidoglycan Revealed by Solid-State NMR Spectroscopy
Nutrient-Dependent StructuralChanges in S.aureus Peptidoglycan Revealed by Solid-State NMR Spectroscopy
http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bichaw/0/bichaw.ahead-of-print/bi3012115/aop/images/medium/bi-2012-012115_0011.gif
Biochemistry
DOI: 10.1021/bi3012115
http://feeds.feedburner.com/~ff/acs/bichaw?d=yIl2AUoC8zA
http://feeds.feedburner.com/~r/acs/bichaw/~4/KQGbaoLxmUQ
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10-02-2012 06:32 PM
Nature and Structure of Aluminum Surface Sites Grafted on Silica from a Combination of High-Field Aluminum-27 Solid-State NMR Spectroscopy and First-Principles Calculations
Nature and Structure of Aluminum Surface Sites Grafted on Silica from a Combination of High-Field Aluminum-27 Solid-State NMR Spectroscopy and First-Principles Calculations
Rachel Nathaniel Kerber, Anthony Kermagoret, Emmanuel Callens, Pierre Florian, Dominique Massiot, Anne Lesage, Christophe Cope?ret, Franc?oise Delbecq, Xavier Rozanska and Philippe Sautet
http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/0/jacsat.ahead-of-print/ja3008566/aop/images/medium/ja-2012-008566_0006.gif
Journal of the American Chemical Society
DOI: 10.1021/ja3008566
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Synergic Effect of Active Sites in Zinc-Modified ZSM-5 Zeolites as Revealed by High-Field Solid-State NMR Spectroscopy
Linear Mode
