Ordering of Silicate Layers by Hydrogen-Bonding Networks:  Solid State NMR Investigation of the Perfect Three-Dimensional Registration in the Layer Silicate RUB-18

1999 ◽  
Vol 103 (29) ◽  
pp. 5933-5938 ◽  
Author(s):  
Ingo Wolf ◽  
Hermann Gies ◽  
Colin A. Fyfe
2007 ◽  
Vol 111 (20) ◽  
pp. 5602-5609 ◽  
Author(s):  
Jason W. Traer ◽  
James F. Britten ◽  
Gillian R. Goward

2005 ◽  
Vol 31 (4) ◽  
pp. 331-336 ◽  
Author(s):  
Kerstin Riedel ◽  
Jörg Leppert ◽  
Oliver Ohlenschläger ◽  
Matthias Görlach ◽  
Ramadurai Ramachandran

2015 ◽  
Vol 71 (10) ◽  
pp. o697-o698 ◽  
Author(s):  
Francesca A. Vaccaro ◽  
Lynn V. Koplitz ◽  
Joel T. Mague

The asymmetric unit of the title salt, C7H7N2+·BF4−, comprises two independent but nearly identical formula units. The solid-state structure comprises corrugated layers of cations and anions, formed by C—H...F hydrogen bonding, that are approximately parallel to (010). Further C—H...F hydrogen bonding consolidates the three-dimensional architecture. The sample was refined as a two-component non-merohedral twin.


2021 ◽  
Author(s):  
Alexander A. Malär ◽  
Laura A. Völker ◽  
Riccardo Cadalbert ◽  
Lauriane Lecoq ◽  
Matthias Ernst ◽  
...  

Temperature-dependent NMR experiments are often complicated by rather long magnetic-field equilibration times, for example occurring upon a change of sample temperature. We demonstrate that the fast temporal stabilization of the magnetic field can be achieved by actively stabilizing the temperature which allows to quantify the weak temperature dependence of the proton chemical shift which can be diagnostic for the presence of hydrogen bonds. Hydrogen bonding plays a central role in molecular recognition events from both fields, chemistry and biology. Their direct detection by standard structure determination techniques, such as X-ray crystallography or cryo-electron microscopy, remains challenging due to the difficulties of approaching the required resolution, on the order of 1 Å. We herein explore a spectroscopic approach using solid-state NMR to identify protons engaged in hydrogen bonds and explore the measurement of proton chemical-shift temperature coefficients. Using the examples of a phosphorylated amino acid and the protein ubiquitin, we show that fast Magic-Angle Spinning (MAS) experiments at 100 kHz yield sufficient resolution in proton-detected spectra to quantify the rather small chemical-shift changes upon temperature variations.<br>


2007 ◽  
Vol 221 (1) ◽  
pp. 155-168 ◽  
Author(s):  
A. Vyalikh ◽  
Th. Emmler ◽  
B. Grünberg ◽  
Y. Xu ◽  
I. Shenderovich ◽  
...  

2019 ◽  
Vol 21 (39) ◽  
pp. 21782-21789 ◽  
Author(s):  
Adam H. Turner ◽  
John D. Holbrey

Neutron scattering reveals the persistent three-dimensional hydrogen-bonding network between glycerol molecules in the 1 : 2 choline chloride/glycerol eutectic.


Toxins ◽  
2011 ◽  
Vol 3 (10) ◽  
pp. 1310-1331 ◽  
Author(s):  
Praveen Chaudhary ◽  
Roxanne A. Shank ◽  
Tony Montina ◽  
James T. Goettel ◽  
Nora A. Foroud ◽  
...  

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