Results 21 to 30 of about 2,750 (239)

Microscopic Pair Potentials and the Physical Properties of the Condensed Phases of Parahydrogen [PDF]

Applied Sciences, 2022
Equilibrium physical properties of the solid and liquid phases of parahydrogen, computed by first principle computer simulations, are compared for different choices of pair-wise, spherically symmetric intermolecular potentials.
Jieru Hu, Massimo Boninsegni
doaj   +2 more sources

Hyperpolarized fumarate via parahydrogen [PDF]

Chemical Communications, 2018
We produce hyperpolarized [1-13C]fumarate in the proton nuclear spin singlet state by pairwise trans-addition of parahydrogen to a molecular precursor using a ruthenium-based catalyst in water.
Barbara Ripka, James Eills, Hana Kouřilová, Markus Leutzsch, Malcolm H. Levitt, Kerstin Münnemann   +5 more
openaire   +7 more sources

SABRE Ir-IMes Catalysis for the Masses [PDF]

Molecules
The Signal Amplification By Reversible Exchange (SABRE) technique provides enhancement of Nuclear Magnetic Resonance (NMR) signals up to several orders of magnitude using chemical exchange of a substrate and parahydrogen on an iridium complex. Therefore,
Izabelle Smith, Noah Terkildsen, Zachary Bender, Abubakar Abdurraheem, Shiraz Nantogma, Anna Samoilenko, Joseph Gyesi, Larisa M. Kovtunova, Oleg G. Salnikov, Igor V. Koptyug, Raphael Kircher, Danila A. Barskiy, Eduard Y. Chekmenev, Roman V. Shchepin   +13 more
doaj   +2 more sources

Parahydrogen-induced polarization and spin order transfer in ethyl pyruvate at high magnetic fields

Scientific Reports, 2022
Nuclear magnetic resonance has experienced great advances in developing and translating hyperpolarization methods into procedures for fundamental and clinical studies. Here, we propose the use of a wide-bore NMR for large-scale (volume- and concentration-
Andrey N. Pravdivtsev, Arne Brahms, Frowin Ellermann, Tim Stamp, Rainer Herges, Jan-Bernd Hövener   +5 more
doaj   +2 more sources

Pd-based bimetallic catalysts for parahydrogen-induced polarization in heterogeneous hydrogenations [PDF]

Magnetic Resonance, 2021
Production of hyperpolarized catalyst-free gases and liquids by heterogeneous hydrogenation with parahydrogen can be useful for various technical as well as biomedical applications, including in vivo studies, investigations of mechanisms of industrially ...
D. B. Burueva, D. B. Burueva, A. Y. Stakheev, I. V. Koptyug, I. V. Koptyug   +4 more
doaj   +2 more sources

Advances in Parahydrogen‐Induced Polarization for Nuclear Magnetic Resonance of Peptides, Proteins, and Biopolymers

ChemistryEurope
Hyperpolarization techniques like parahydrogen‐induced polarization significantly enhance nuclear magnetic resonance (NMR) sensitivity but have been underexplored for larger biomolecules and biopolymers. Here, after a short introduction into parahydrogen‐
Gerd Buntkowsky
doaj   +2 more sources

A Versatile Compact Parahydrogen Membrane Reactor

ChemPhysChem, 2021
AbstractWe introduce a Spin Transfer Automated Reactor (STAR) that produces continuous parahydrogen induced polarization (PHIP), which is stable for hours to days. We use the PHIP variant called signal amplification by reversible exchange (SABRE), which is particularly well suited to produce continuous hyperpolarization.
Patrick Tomhon, Suyong Han, Soren Lehmkuhl   +2 more
exaly   +5 more sources

Through-bond and through-space radiofrequency amplification by stimulated emission of radiation [PDF]

Communications Chemistry
Radio Amplification by Stimulated Emission of Radiation (RASER) is a phenomenon observed during nuclear magnetic resonance (NMR) experiments with strongly negatively polarized systems. This phenomenon may be utilized for the production of very narrow NMR
Ivan A. Trofimov, Oleg G. Salnikov, Andrey N. Pravdivtsev, Henri de Maissin, Anna P. Yi, Eduard Y. Chekmenev, Jan-Bernd Hövener, Andreas B. Schmidt, Igor V. Koptyug   +8 more
doaj   +2 more sources

Magnetic shielding of parahydrogen hyperpolarization experiments for the masses

Magnetic resonance in chemistry : MRC, 2021
[Image: see text] We report on the inexpensive ($80) custom electronics for efficient robust and fast degaussing of mu-metal shields for use in parahydrogen induced polarization experiments.
Md Raduanul H. Chowdhury, Eduard Y. Chekmenev, Nantogma, Shiraz, Joalland, Baptiste, Baptiste Joalland, Panayiotis Nikolaou, Chowdhury, Md Raduanul H., Chekmenev, Eduard Y., Shiraz Nantogma, Nikolaou, Panayiotis   +9 more
core   +2 more sources

Analysis of chemical exchange in iridium N-heterocyclic carbene complexes using heteronuclear parahydrogen-enhanced NMR

Communications Chemistry
The signal amplification by reversible exchange process (SABRE) enhances NMR signals by unlocking hidden polarization in parahydrogen through interactions with to-be-hyperpolarized substrate molecules when both are transiently bound to an Ir-based ...
Charbel D. Assaf, Xin Gui, Oleg G. Salnikov, Arne Brahms, Nikita V. Chukanov, Ivan V. Skovpin, Eduard Y. Chekmenev, Rainer Herges, Simon B. Duckett, Igor V. Koptyug, Kai Buckenmaier, Rainer Körber, Markus Plaumann, Alexander A. Auer, Jan-Bernd Hövener, Andrey N. Pravdivtsev   +15 more
doaj   +2 more sources