Carbene Analogues of Group 15: Reduction of s-Hydrindacene-Based Chloropnictogenium Ions To Access an Antimony Hydride Monocation and a Trinuclear Bismuth Dication

We report the synthesis of three chloropnictogenium cations [MSFluindECl]+ (2As, 2Sb and 2 Bi), which unravel different reaction pathways toward Et3SiH, leading to the formation of the neutral arylars...

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K2 The killer summit 720p (BBC FOUR HD)

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Swiss court clears sleuth in defamation case, awards him legal costs

iStock An appeals court in Switzerland has overturned a 2025 defamation conviction against a sleuth who had identified dozens of conference proceedings with signs of citation manipulation. The ruli…

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2025 Organic Reaction Championship - ACS Division of Organic Chemistry

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Diaryl Bismuthides and Acyl Bismuthanes Enable Visible-Light-Induced Reversible Carbon Monoxide Insertion and Extrusion - Nature Communications

Carbon monoxide (CO) is one of the simplest and most fundamental molecules that has fascinated chemists for decades. Early-on, chemists have recognized and exploited its favorable properties as a key ...

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Assistant Professor, Electrochemistry for Energy Conversion/Storage, Faculty of Science in Calgary, AB, Canada | Roland Roesler

The Department of Chemistry at the University of Calgary is advertising an Assistant Professor position in the area of Electrochemistry for Energy Conversion and Storage. Deadline to apply January 9, ...

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Assistant Professor, Computational Chemistry for Energy Materials, Faculty of Science in Calgary, AB, Canada | Roland Roesler

The Department of Chemistry at the University of Calgary is advertising an Assistant Professor position in the area of Computational Chemistry for Energy Materials. Deadline to apply January 9, 2026. ...

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Electrostatic Fields Induce Accelerated Proton Coupled Electron Transfer Rates in Chlorophyll Model Compounds

Chlorophyll-based pigments are crucial mediators of redox processes in photosynthesis, serving as the primary electron donors in photosystems I and II. Despite their structural similarities, these pigments exhibit a wide range of redox potentials (0.5–1.3 V vs SHE), and little experimental insight into the origins of this variation is available. To address this deficit, we have synthesized two crown ether-appended Mg-porphyrin complexes as chlorophyll model compounds and demonstrated their ability to bind redox-inactive metal cations. Cation binding to the Mg-porphyrin complexes was found to increase their redox potentials in a manner that depends linearly on the total cationic charge felt by the complex, implicating a through-space electrostatic field effect. The corresponding 1-electron oxidized π-cation radical complexes were then prepared and characterized by UV–vis, FT-IR, and EPR spectroscopies and ESI-MS. The π-cation radical species were found to be competent for the PCET oxidation of a phenolic substrate, mimicking the reaction between photo-oxidized chlorophyll and tyrosine in photosystem II. Cation binding to the π-cation radical complexes was found to increase the rates of their PCET and ET reactions in a charge-dependent manner which could be rationalized using Marcus theory. This work provides direct experimental evidence that electrostatic fields can tune the redox potentials of chlorophyll model compounds, leading to an increase in their oxidative reactivity.

doi.org

Trump administration targets academic journals with attorney letter, proposed funding cuts

Budget plan would kill two CDC journals, while U.S. prosecutor accuses some nongovernmental publications of being “partisans”

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Geometrically Constrained Bismuth Compounds

A major thrust of research in modern main group chemistry is the use of multidentate ligands to perturb geometries at p-block elements such that they deviate substantially from valence shell electron-...

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Synthesis of a Transient Cationic Phosphaborene and its Trapping by Facile Aliphatic C−H Bond Activation

Abstraction of bromide from a B-brominated phosphaborene stabilized by a cyclic alkylamino carbene results in the formation of a transient cationic phosphaborene, which undergoes intramolecular C−H a....

doi.org

Modern NMR Crystallography: Concepts and Applications

NMR crystallography has blossomed as a focussed field of research in recent years and is now acknowledged as such by the International Union of Crystallogr

doi.org

Dicationic Boron Derivatives of Schlenk’s and Thiele’s Hydrocarbon

In recent years, neutral NHC-stabilized boryl radicals have been investigated as reactive species in various organic transformations. However, cationic boron radicals have been significantly less explored. In addition, boron-centered open-shell species with S > 1/2 have emerged as attractive synthetic targets. In this study, we provide a synthetic route to an NHC-stabilized boryl radical cation as a salt of the weakly coordinating [Al(ORF)4]− (RF = C(CF3)3) anion. The synthetic procedure was extended to dicationic diboron derivatives of Schlenk’s and Thiele’s hydrocarbons with meta- and para-phenylene coupling units between the spin centers. While most known isolable boron biradicals have a singlet ground-state with a thermally accessible triplet state, the boron version of Schlenk’s hydrocarbon occupies a ground-state triplet spin-state, as shown by combined electron paramagnetic resonance spectroscopy and density functional theory studies. Furthermore, initial reactivity studies of the dications with elemental sulfur and diphenyldiselenide are presented.

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Metal-free alkene hydroboration with pinacolborane employing C6F5BH2·SMe2 precatalyst

We have developed C6F5BH2·SMe2 as a unique, metal-free precatalyst for alkene hydroboration. It combines high reactivity and excellent regio- and chemoselectivity. Mechanistic studies reveal that the ...

pubs.rsc.org

Synthesis of triple-decker sandwich compounds featuring a M–M bond through cyclo-Bi5 and cyclo-Sb5 rings - Nature Chemistry

Although several inorganic analogues of cyclopentadiene have been reported with group-15 elements, examples featuring the heavier elements Sb and Bi remain scarce. Now, a Bi5 ring has been stabilized ...

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Seabirds in crisis: Plastic ingestion induces proteomic signatures of multiorgan failure and neurodegeneration

Plastic consumption in seabirds causes blood signatures of widespread organ damage including brain, stomach, kidney, and liver.

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Carbene-activated stannylenes to access selective C(sp3)–H bond scission at the steric limit - Nature Communications

The ubiquity of N-heterocyclic carbenes (NHCs) in chemical research typically arises from their potent stabilizing capabilities and role as innocent spectators to stabilize otherwise non-bottleable co...

nature.com

Assistant Professor- Tenure Track Position- Department of Island Studies/Cleantech- Faculty of Arts *Amended closing date* | University of Prince Edward Island

The University of Prince Edward Island offers an amazing and affordable student experience in beautiful Charlottetown, PEI. Our interesting and unique programs bring out your best, lead you to realize...

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Excited-state configuration of nitroarenes enables oxidative cleavage of aromatics over alkenes

The ozonolytic deconstruction of aromatics remains a challenge in organic chemistry. Ozone preferentially reacts with alkenes over arenes, meaning that once the initial aromatic cleavage occurs, the d...

science.org