Molecular oxygen
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Untangling the sequence of events during the S <sub>2</sub> → S <sub>3</sub> transition in photosystem II and implications for the water oxidation mechanism Open
In oxygenic photosynthesis, light-driven oxidation of water to molecular oxygen is carried out by the oxygen-evolving complex (OEC) in photosystem II (PS II). Recently, we reported the room-temperature structures of PS II in the four (semi…
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A tautomeric ligand enables directed C‒H hydroxylation with molecular oxygen Open
Easing oxygen into arenes Although oxygen is all around us, it is often surprisingly difficult to use it for selective chemical oxidations, necessitating more expensive, wasteful alternatives. Li et al. report that careful ligand optimizat…
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Cobalt(<span>iii</span>) catalyzed C-8 selective C–H and C–O coupling of quinoline N-oxide with internal alkynes via C–H activation and oxygen atom transfer Open
An efficient, scalable, atom-economical, regio-selective air stable Cp*Co(iii) catalyzed C–H and C–O couplingviaa C–H activation/oxygen atom transfer reaction of quinolineN-oxide and an internal alkyne is reported.
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Molecular iron complexes as catalysts for selective C–H bond oxygenation reactions Open
This feature article summarises recent developments in homogeneous C–H bond oxygenation catalysed by molecular iron complexes.
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Interface boosted highly efficient selective photooxidation in Bi3O4Br/Bi2O3 heterojunctions Open
Selective photooxidation of amines to biologically important imines is in great demand for industrial applications. The conversion efficiency and selectivity of the process are strongly dependent on the activation of photocatalytic molecul…
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Protection of densely populated excited triplet state ensembles against deactivation by molecular oxygen Open
Different approaches towards protection of triplet excited states against deactivation by molecular oxygen are summarized and reviewed.
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Regioselective Copper‐Catalyzed Oxidative Cross‐Coupling of Imidazo[1,2‐<i>a</i>]pyridines with Methyl Ketones: An Efficient Route for Synthesis of 1,2‐Diketones Open
An efficient copper‐catalyzed oxidative coupling of imidazo[1,2‐ a ]pyridines with methyl ketones to directly generate structurally sophisticated 1,2‐dicarbonyl imidazo[1,2‐ a ]pyridine derivatives under oxidative conditions is described. …
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Metal-free activation of molecular oxygen by covalent triazine frameworks for selective aerobic oxidation Open
Low-cost metal-free catalysts enable O 2 activation as a key step in many important sustainable processes.
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Oxygen‐sensing mechanisms in cells Open
The importance of oxygen for the survival of multicellular and aerobic organisms is well established and documented. Over the years, increased knowledge of its use for bioenergetics has placed oxygen at the centre of research on mitochondr…
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Gold nanoparticles supported on mesoporous silica: origin of high activity and role of Au NPs in selective oxidation of cyclohexane Open
Homogeneous immobilization of gold nanoparticles (Au NPs) on mesoporous silica has been achieved by using a one-pot synthesis method in the presence of organosilane mercapto-propyl-trimethoxysilane (MPTMS). The resultant Au NPs exhibited a…
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Aerobic Oxidation Catalysis with Air or Molecular Oxygen and Ionic Liquids Open
Selective aerobic oxidation reactions are most important and challenging transformations in both academic research and the chemical industry. Over the past decade, ionic liquids have gained recognition in the context of green organic synth…
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Ultra-low volume oxygen tolerant photoinduced Cu-RDRP Open
We introduce the first oxygen tolerant ultra-low volume (as low as 5 μL) photoinduced Cu-RDRP of a range of hydrophobic, hydrophilic and semi-fluorinated monomers.
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Selective photocatalytic hydroxylation and epoxidation reactions by an iron complex using water as the oxygen source Open
Iron complex catalysed selective and efficient photocatalytic hydroxylation and epoxidation reactions using water as the oxygen atom source has been reported.
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XABOOM: An X-ray Absorption Benchmark of Organic Molecules Based on Carbon, Nitrogen, and Oxygen 1s → π* Transitions Open
The performance of several standard and popular approaches for calculating X-ray absorption spectra at the carbon, nitrogen, and oxygen K-edges of 40 primarily organic molecules up to the size of guanine has been evaluated, focusing on the…
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Computational Design, Synthesis, and Photochemistry of Cy7‐PPG, an Efficient NIR‐Activated Photolabile Protecting Group for Therapeutic Applications** Open
Photolabile Protecting Groups (PPGs) are molecular tools used, for example, in photopharmacology for the activation of drugs with light, enabling spatiotemporal control over their potency. Yet, red‐shifting of PPG activation wavelengths in…
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High temperature and pressure inside a dissolving oxygen nanobubble Open
Numerical simulations of dissolution of an oxygen (O2) nanobubble into water without dynamic stimuli have been performed in order to study the possibility of OH radical formation from oxygen nanobubbles experimentally reported by Liu et al…
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Copper(<span>ii</span>)-photocatalyzed decarboxylative oxygenation of carboxylic acids Open
Choosing the right coordination geometry for the light-induced Cu( ii )-catalyzed oxidative decarboxylation.
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Binding of molecular oxygen by an artificial heme analogue: investigation on the formation of an Fe–tetracarbene superoxo complex Open
The reactivity of a heme-like organometallic Fe–NHC complex with O2 is studied. The formation of a superoxo Fe(iii) intermediate is observed. The reactivity of the intermediate in acetone and acetonitrile is described and the products are …
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Ligand-Enabled Pd(II)-Catalyzed C(sp<sup>3</sup>)–H Lactonization Using Molecular Oxygen as Oxidant Open
Pd(II)-catalyzed C-H lactonization of o-methyl benzoic acid substrates has been achieved using molecular oxygen as the oxidant. This finding provides a rare example of C-H oxygenation through Pd(II)/Pd(0) catalysis as well as a method to c…
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A Metalloenzyme‐Like Catalytic System for the Chemoselective Oxidative Cross‐Coupling of Primary Amines to Imines under Ambient Conditions Open
The direct oxidative cross‐coupling of primary amines is a challenging transformation as homocoupling is usually preferred. We report herein the chemoselective preparation of cross‐coupled imines through the synergistic combination of low …
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Base metal-catalyzed benzylic oxidation of (aryl)(heteroaryl)methanes with molecular oxygen Open
The methylene group of various substituted 2- and 4-benzylpyridines, benzyldiazines and benzyl(iso)quinolines was successfully oxidized to the corresponding benzylic ketones using a copper or iron catalyst and molecular oxygen as the stoic…
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Tracking the route of molecular oxygen in O <sub>2</sub> -tolerant membrane-bound [NiFe] hydrogenase Open
Significance Tracking the route of substrates, intermediates, and inhibitors in proteins is fundamental in understanding their specific function. However, following the route of gases like molecular oxygen within enzymes has always been ch…
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Activation of molecular oxygen by a molybdenum complex for catalytic oxidation Open
Activation of molecular oxygen by a Mo(iv) complex yields the corresponding oxo–peroxo complex, which is able to catalyze oxygen atom transfer to a model substrate by transferring both oxygen atoms of the peroxo group.
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Molecular and Therapeutic Aspects of Hyperbaric Oxygen Therapy in Neurological Conditions Open
In hyperbaric oxygen therapy (HBOT), the subject is placed in a chamber containing 100% oxygen gas at a pressure of more than one atmosphere absolute. This treatment is used to hasten tissue recovery and improve its physiological aspects, …
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Porphyrin based metal–organic frameworks: highly sensitive materials for optical sensing of oxygen in gas phase Open
Luminescence of PCN-224-based MOFs is efficiently quenched by molecular oxygen making them promising for optical sensing of oxygen in the gas phase.
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Molecular Tools to Generate Reactive Oxygen Species in Biological Systems Open
Reactive oxygen species (ROS) not only are byproducts of aerobic respiration, but also play vital roles in metabolism regulation and signal transductions. It is important to understand the functions of ROS in biological systems. In additio…
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Solid-state molecular oxygen activation using ball milling and a piezoelectric material for aerobic oxidation of thiols Open
The agitation of BaTiO 3 via ball milling converts mechanical energy into electrical energy, leading to the reduction of molecular oxygen via a single electron transfer pathway analogous to the photocatalytic reaction.
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Hybrid photoanodes for water oxidation combining a molecular photosensitizer with a metal oxide oxygen-evolving catalyst Open
Hybrid photoanodes for water oxidation, using an n-semiconductor photosensitized by a molecular dye associated with an inorganic catalyst, are overviewed.
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The Asparagine Hydroxylase FIH: A Unique Oxygen Sensor Open
Significance: Limited oxygen availability (hypoxia) commonly occurs in a range of physiological and pathophysiological conditions, including embryonic development, physical exercise, inflammation, and ischemia. It is thus vital for cells a…
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Searching for molecular hypoxia sensors among oxygen-dependent enzymes Open
The ability to sense and respond to changes in cellular oxygen levels is critical for aerobic organisms and requires a molecular oxygen sensor. The prototypical sensor is the oxygen-dependent enzyme PHD: hypoxia inhibits its ability to hyd…