MRI and PGSE NMR Studies of Long-range, Pore-pore Interaction Effects in Gas Adsorption

2011 ◽  
Author(s):  
Iain Hitchcock ◽  
Sean Rigby ◽  
John Chudek ◽  
Liz Holt ◽  
John Lowe
Keyword(s):  
Long Range ◽  
Gas Adsorption ◽  
Interaction Effects ◽  
Nmr Studies ◽  
Pgse Nmr

NMR studies. XXL. Stereochemistry of 9-alkyl-9,10-dihydroanthracenes. Conformation by nuclear Overhauser enhancements and long-range coupling constants

1970 ◽  
Vol 92 (20) ◽  
pp. 5912-5916 ◽  
Author(s):  
Allan W. Brinkmann ◽  
M. Gordon ◽  
Ronald G. Harvey ◽  
Peter W. Rabideau ◽  
J. B. Stothers ◽  
...  
Keyword(s):  
Long Range ◽  
Coupling Constants ◽  
Nmr Studies ◽  
Nuclear Overhauser

scholarly journals The Palladium(II) Complex of Aβ4−16 as Suitable Model for Structural Studies of Biorelevant Copper(II) Complexes of N-Truncated Beta-Amyloids

2020 ◽  
Vol 21 (23) ◽  
pp. 9200
Author(s):  
Mariusz Mital ◽  
Kosma Szutkowski ◽  
Karolina Bossak-Ahmad ◽  
Piotr Skrobecki ◽  
Simon C. Drew ◽  
...  
Keyword(s):  
Supramolecular Assembly ◽  
Ros Generation ◽  
Suitable Model ◽  
Nmr Studies ◽  
Exchange Processes ◽  
Square Planar ◽  
Synthetic Procedure ◽  
Complex Forms ◽  
Pgse Nmr ◽  
Kinetic Trapping

The Aβ4−42 peptide is a major beta-amyloid species in the human brain, forming toxic aggregates related to Alzheimer’s Disease. It also strongly chelates Cu(II) at the N-terminal Phe-Arg-His ATCUN motif, as demonstrated in Aβ4−16 and Aβ4−9 model peptides. The resulting complex resists ROS generation and exchange processes and may help protect synapses from copper-related oxidative damage. Structural characterization of Cu(II)Aβ4−x complexes by NMR would help elucidate their biological function, but is precluded by Cu(II) paramagneticism. Instead we used an isostructural diamagnetic Pd(II)-Aβ4−16 complex as a model. To avoid a kinetic trapping of Pd(II) in an inappropriate transient structure, we designed an appropriate pH-dependent synthetic procedure for ATCUN Pd(II)Aβ4−16, controlled by CD, fluorescence and ESI-MS. Its assignments and structure at pH 6.5 were obtained by TOCSY, NOESY, ROESY, 1H-13C HSQC and 1H-15N HSQC NMR experiments, for natural abundance 13C and 15N isotopes, aided by corresponding experiments for Pd(II)-Phe-Arg-His. The square-planar Pd(II)-ATCUN coordination was confirmed, with the rest of the peptide mostly unstructured. The diffusion rates of Aβ4−16, Pd(II)-Aβ4−16 and their mixture determined using PGSE-NMR experiment suggested that the Pd(II) complex forms a supramolecular assembly with the apopeptide. These results confirm that Pd(II) substitution enables NMR studies of structural aspects of Cu(II)-Aβ complexes.

scholarly journals Delocalized excitons and interaction effects in extremely dilute thermal ensembles

2019 ◽  
Vol 21 (5) ◽  
pp. 2276-2282 ◽  
Author(s):  
Lukas Bruder ◽  
Alexander Eisfeld ◽  
Ulrich Bangert ◽  
Marcel Binz ◽  
Max Jakob ◽  
...  
Keyword(s):  
Long Range ◽  
Interaction Effects ◽  
Femtosecond Spectroscopy ◽  
Atomic Ensembles ◽  
Interparticle Interactions ◽  
Highly Sensitive

Long-range interparticle interactions are revealed in extremely dilute thermal atomic ensembles using highly sensitive nonlinear femtosecond spectroscopy.

7Li NMR Studies of Short-Range and Long-Range Lithium Ion Dynamics in a Heat-Treated Lithium Iodide-Doped Lithium Thiophosphate Glass Featuring High Ion Conductivity

2020 ◽  
Vol 124 (52) ◽  
pp. 28614-28622
Author(s):  
Edda Winter ◽  
Philipp Seipel ◽  
Vanessa Miß ◽  
Stefan Spannenberger ◽  
Bernhard Roling ◽  
...  
Keyword(s):  
Long Range ◽  
Short Range ◽  
Lithium Ion ◽  
Ion Conductivity ◽  
Ion Dynamics ◽  
Lithium Iodide ◽  
Nmr Studies ◽  
Heat Treated ◽  
7Li Nmr

PGSE NMR Studies on RAPTA Derivatives: Evidence for the Formation of H-Bonded Dicationic Species

2008 ◽  
Vol 27 (7) ◽  
pp. 1649-1652 ◽  
Author(s):  
Sandra Bolaño ◽  
Gianluca Ciancaleoni ◽  
Jorge Bravo ◽  
Luca Gonsalvi ◽  
Alceo Macchioni ◽  
...  
Keyword(s):  
Nmr Studies ◽  
Pgse Nmr
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