Hydrogen isotope
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Barely porous organic cages for hydrogen isotope separation Open
Quantum sieves for hydrogen isotopes One method for improving the efficiency of separation of hydrogen from deuterium (D) is to exploit kinetic quantum sieving with nanoporous solids. This method requires ultrafine pore apertures (around 3…
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Quantum Sieving for Separation of Hydrogen Isotopes Using MOFs Open
Hydrogen isotope mixtures can be separated either by confinement in small pores [i.e., “kinetic quantum sieving” (KQS)] or by strong adsorption sites [i.e., “chemical affinity quantum sieving” (CAQS)]. MOFs are excellent candidates for stu…
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Highly Selective Directed Iridium‐Catalyzed Hydrogen Isotope Exchange Reactions of Aliphatic Amides Open
For the first time, we describe highly selective homogeneous iridium‐catalyzed hydrogen isotope exchange (HIE) of unactivated C(sp 3 ) centers in aliphatic amides. When using the commercially available Kerr catalyst, the HIE with a series …
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Cobalt-Catalyzed Stereoretentive Hydrogen Isotope Exchange of C(sp<sup>3</sup>)–H Bonds Open
Cobalt dialkyl complexes bearing α-diimine ligands proved to be active precatalysts for the nondirected, C(sp3)-H selective hydrogen isotope exchange (HIE) of alkylarenes using D2 gas as the deuterium source. Alkylarenes with a variety of …
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On-Line Hydrogen-Isotope Measurements of Organic Samples Using Elemental Chromium: An Extension for High Temperature Elemental-Analyzer Techniques Open
The high temperature conversion (HTC) technique using an elemental analyzer with a glassy carbon tube and filling (temperature conversion/elemental analysis, TC/EA) is a widely used method for hydrogen isotopic analysis of water and many s…
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Exploiting Dynamic Opening of Apertures in a Partially Fluorinated MOF for Enhancing H<sub>2</sub> Desorption Temperature and Isotope Separation Open
Deuterium has been recognized as an irreplaceable element in industrial and scientific research. However, hydrogen isotope separation still remains a huge challenge due to the identical physicochemical properties of the isotopes. In this p…
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NHC‐Stabilized Iridium Nanoparticles as Catalysts in Hydrogen Isotope Exchange Reactions of Anilines Open
The preparation of N‐heterocyclic carbene‐stabilized iridium nanoparticles and their application in hydrogen isotope exchange reactions is reported. These air‐stable and easy‐to‐handle iridium nanoparticles showed a unique catalytic activi…
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Efficient Access to Deuterated and Tritiated Nucleobase Pharmaceuticals and Oligonucleotides using Hydrogen‐Isotope Exchange Open
A general approach for the efficient hydrogen‐isotope exchange of nucleobase derivatives is described. Catalyzed by ruthenium nanoparticles, using mild reaction conditions, and involving either D 2 or T 2 as isotopic sources, this reaction…
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Hydrogen Isotope Separation Using a Metal–Organic Cage Built from Macrocycles Open
Porous materials that contain ultrafine pore apertures can separate hydrogen isotopes via kinetic quantum sieving (KQS). However, it is challenging to design materials with suitably narrow pores for KQS that also show good adsorption capac…
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Isotopic niches support the resource breadth hypothesis Open
Summary Because a broad spectrum of resource use allows species to persist in a wide range of habitat types, and thus permits them to occupy large geographical areas, and because broadly distributed species have access to more diverse reso…
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Tracing ‘Third Pole’ ice meltwater contribution to the Himalayan rivers using oxygen and hydrogen isotopes Open
Global warming is adversely affecting the melting rates of Himalayan glaciers, which feed a number of large river systems in the Indian sub-continent.Regional scale assessment of glaciers and their link to rivers are mostly quantified usin…
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Stone–Wales Defects Cause High Proton Permeability and Isotope Selectivity of Single‐Layer Graphene Open
While the isotope‐dependent hydrogen permeability of graphene membranes at ambient condition has been demonstrated, the underlying mechanism has been controversially discussed during the past 5 years. The reported room‐temperature proton‐o…
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A high‐temperature water vapor equilibration method to determine non‐exchangeable hydrogen isotope ratios of sugar, starch and cellulose Open
The analysis of the non‐exchangeable hydrogen isotope ratio (δ 2 H ne ) in carbohydrates is mostly limited to the structural component cellulose, while simple high‐throughput methods for δ 2 H ne values of non‐structural carbohydrates (NSC…
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Novel low energy hydrogen–deuterium isotope breakthrough separation using a trapdoor zeolite Open
Cs-chabazite, a type of zeolite with caesium counter-cations, possesses interesting gas separation properties due to a highly selective molecular “trapdoor” effect. Herein the use of this material for H2/D2 isotope separation is demonstrat…
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Evaluation of a <span>P,N</span>‐ligated iridium(I) catalyst in hydrogen isotope exchange reactions of aryl and heteroaryl compounds Open
We have developed a novel and efficient iridium‐catalyzed hydrogen isotope exchange reaction method with secondary and tertiary sulfonamides at ambient temperatures. Furthermore N ‐oxides and phosphonamides have been successfully applied i…
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Predicting origins of passerines migrating through Canadian migration monitoring stations using stable-hydrogen isotope analyses of feathers: a new tool for bird conservation Open
The Canadian Migration Monitoring Network (CMMN) consists of standardized observation and migration count stations located largely along Canada's southern border. A major purpose of CMMN is to detect population trends of migratory passerin…
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Hydrogen Isotope Exchange Catalyzed by Ru Nanocatalysts: Labelling of Complex Molecules Containing <i>N</i>‐Heterocycles and Reaction Mechanism Insights Open
Ruthenium nanocatalysis can provide effective deuteration and tritiation of oxazole, imidazole, triazole and carbazole substructures in complex molecules using D 2 or T 2 gas as isotopic sources. Depending on the substructure considered, t…
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How coverage influences thermodynamic and kinetic isotope effects for H<sub>2</sub>/D<sub>2</sub> dissociative adsorption on transition metals Open
Hydrogen isotope effects are influenced by adsorbate coverage: at high coverages, isotope effects are lower than at low coverages. This helps to rationalize observed isotope effects, allowing more precise elucidation of reaction mechanisms.
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The next generation of low tritium hydrogen isotope separation technologies for future fusion power plants Open
The separation of hydrogen isotopes is a vital step in preparing tritium and deuterium fuels for future fusion power plants. This represents a fundamental challenge to fusion energy since the separation process must be able to handle high …
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Isotope Effects on Chemical Shifts in the Study of Intramolecular Hydrogen Bonds Open
The paper deals with the use of isotope effects on chemical shifts in characterizing intramolecular hydrogen bonds. Both so-called resonance-assisted (RAHB) and non-RAHB systems are treated. The importance of RAHB will be discussed. Anothe…
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Stable isotope dilution mass spectrometry quantification of hydrogen sulfide and thiols in biological matrices Open
A stable-isotope-dilution LC-MS/MS method is presented for the simultaneous quantification of Total H2S and multiple thiols in biological matrices. We then use this assay panel to show a striking age-related decline and gut microbiota cont…
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Identifying migratory pathways of Nathusius' pipistrelles ( <i>Pipistrellus nathusii</i> ) using stable hydrogen and strontium isotopes Open
Rationale Identifying migratory corridors of animals is essential for their effective protection, yet the exact location of such corridors is often unknown, particularly for elusive animals such as bats. While migrating along the German co…
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Isotope Separation: Hydrogen Isotope Separation in Confined Nanospaces: Carbons, Zeolites, Metal–Organic Frameworks, and Covalent Organic Frameworks (Adv. Mater. 20/2019) Open
In article number 1805293, Hyunchul Oh, Hoi Ri Moon, and Jin Yeong Kim discuss recent developments and new perspectives, as well as separation mechanisms, for hydrogen-isotope separation using nanoporous materials. Various types of nanopor…
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NHC‐Stabilized Iridium Nanoparticles as Catalysts in Hydrogen Isotope Exchange Reactions of Anilines Open
The preparation of N‐heterocyclic carbene‐stabilized iridium nanoparticles and their application in hydrogen isotope exchange reactions is reported. These air‐stable and easy‐to‐handle iridium nanoparticles showed a unique catalytic activi…
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Compound‐specific stable hydrogen isotope ( <i>δ</i> <sup>2</sup> H) analyses of fatty acids: A new method and perspectives for trophic and movement ecology Open
Rationale Compound‐specific stable isotope analysis (CSIA) is a powerful tool for a better understanding of trophic transfer of dietary molecules in and across ecosystems. Hydrogen isotope values ( δ 2 H) in consumer tissues have potential…
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Alkali-metal bases in catalytic hydrogen isotope exchange processes Open
Alkali-metal bases can also catalyse Hydrogen Isotope Exchange reactions. This minireview highlights the last developments of the field, their benefits and limitations.
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A quantitative empirical directing group scale for selectivity in iridium-catalysed hydrogen isotope exchange reactions Open
Competition hydrogen isotope exchange (HIE) experiments are used to construct quantitative directing group scales for two catalysts; these can be used to predict the outcomes of HIE reactions of substrates with multiple directing groups.
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Origins of Six Species of Butterflies Migrating through Northeastern Mexico: New Insights from Stable Isotope (δ2H) Analyses and a Call for Documenting Butterfly Migrations Open
Determining migratory connectivity within and among diverse taxa is crucial to their conservation. Insect migrations involve millions of individuals and are often spectacular. However, in general, virtually nothing is known about their str…
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Hydrogen isotope exchange in tungsten during annealing in hydrogen atmosphere Open
The radiological safety of the future thermonuclear fusion devices depends critically on the total tritium inventory in the plasma-facing components. The planned method to remove tritium from the ITER reactor tungsten divertor is to perfor…
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Applications of hydrogen as a collision and reaction cell gas for enhanced measurement capability applied to low level stable and radioactive isotope detection using ICP-MS/MS Open
Applications of hydrogen as a collision/reaction gas for enhanced interference removal and expanding the number of pollutants measurable.