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Endo-selective [2+2] cycloaddition of norbornadienes enables the synthesis of homocubanes

Nature Chemistry, Published online: 10 July 2026; doi:10.1038/s41557-026-02201-xThe [2+2] cycloaddition of norbornadienes and alkynes usually favours the formation of the exo adducts. Now, a nickel-catalysed endo-selective [2+2] cycloaddition has been developed, which has been used to generate otherwise elusive endo-tricyclononadienes, and further derivatized via intramolecular [2+2] photocycloaddition to synthesize homocubanes.

dlvr.it

Serendipitous twist in a hemithioindigo molecular motor enables energy storage

Nature Chemistry, Published online: 29 June 2026; doi:10.1038/s41557-026-02191-wHemithioindigo-based molecular motors are driven by visible light and their rotation has been branded as ‘sunlight-powered’, but for a decade this ability has remained unexploited. Now, a subtle change in their structure leads to a serendipitous ‘supercharged’ intermediate, ready to store the Sun’s energy.

dlvr.it

Shape-Conserving Atom Replacements

Recent advances have made possible the replacement of individual atoms within a molecular skeleton while preserving the integrity of the surrounding framework. These skeletal editing reactions are emerging as powerful tools for molecular optimization, as they directly mirror tactics central to structure–activity-relationship studies and therefore have the potential to accelerate progress in discovery chemistry settings. This review introduces a comprehensive framework for categorizing atom replacement reactions in aromatic systems, while also delineating strategies that enable these transformations. Important heuristics related to shape-conservation are discussed, including notions of skeletal rotation, introduction of vestigial substituents, and retrosynthetic simplicity. Examples of reactions which obey these principles are analyzed, focusing first on C-to-N replacement in aromatic systems (“benzene to pyridine” and related reactions) before moving to other classes of aromatic and aliphatic replacement reactions.

pubs.acs.org

Molecular solar thermal energy storage in Dewar pyrimidone beyond 1.6 megajoules per kilogram

Storing sunlight in a compact and rechargeable form remains a central challenge for solar energy utilization. Molecular solar thermal (MOST) energy storage systems, which harness photon energy and rel...

science.org

Emissive organic crystals and device applications

Emissive organic crystals represent a rapidly advancing frontier in materials science, offering a unique platform that merges the superior optoelectronic characteristics of crystalline order with high-efficiency light emission. This review comprehensively surveys the field, from the fundamental molecular design pri

pubs.rsc.org

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Exploring Spin-State Selective Harvesting Pathways from Singlet Fission Dimers to a Near-Infrared-Emissive Spin-Flip Emitter

Singlet fission (SF), a photophysical process generating two triplet excitons from one singlet exciton, has the potential to boost efficiency in photovoltaics and organic light-emitting diodes. Previous studies on energy-level control and intermolecular interactions have identified key factors for maximizing the efficiency of the initial SF process. However, in isothermic/endothermic SF systems, such as tetracene derivatives, the subsequent sensitization process becomes less efficient in the presence of a competing Förster resonance energy transfer (FRET) process. Here, we demonstrate that a molybdenum-based near-infrared light-emitting spin-flip emitter serves as a triplet-selective energy acceptor from triplet states of tetracene-based dimers generated by SF. The large energy gap existing between the spin-allowed transitions and the luminescent spin-flip transition of the molybdenum complex allowed efficient exothermic triplet energy transfer (TET) to the spin-flip excited doublet state of the complex while circumventing the FRET from the initially formed tetracene singlet state to the high-energy spin-allowed states of the complex. The quantum yields of the doublet state formation of the molybdenum complex by tetracene-based SF dimers with phenylene, 2,5-methylphenylene, and p-terphenylene bridging units were quantified to be 112 ± 6%, 132 ± 2%, and 128 ± 4%, respectively, in solution. The drop of fluorescence lifetimes of the SF dimers at high concentrations of the molybdenum complex implies energy transfer from exchange-coupled triplet pairs, highlighting the importance of controlling exchange interaction and triplet pair recombination. This work represents a significant step toward developing exciton/photon amplification materials by combining SF materials with transition-metal complexes, advancing the application of SF beyond conventional limitations.

pubs.acs.org

Out-of-equilibrium sensing with a chemically fueled molecular machine

Biological adaptive receptors are driven out of equilibrium to change the detectable range of analyte concentrations. Here, a chemically fueled rotaxane information ratchet couples Zn(II) binding to c...

cell.com

Skeletal editing by iron-catalyzed carbene insertion of trichloromethanes

Direct interchange between five- and six-membered nitrogen heterocycles by skeletal editing is valuable in drug discovery. Specifically, inserting a c…

sciencedirect.com

Generating extended foldamer dye stacks and unravelling their evolving exciton dynamics - Nature Chemistry

Synthetic dye-based analogues of biomacromolecules often rely on simple dimers to model solid-state photofunctional behaviour. Now an iterative block-based coupling protocol has been developed that ge...

nature.com

Cationic diketopyrrolopyrroles as potent photosensitizers for the photodynamic inactivation of methicillin-resistant Staphylococcus aureus

Diketopyrrolopyrroles (DPP) are a multifaceted family of organic dyes that have attracted considerable attention in optoelectronic applications due to…

sciencedirect.com

a person is holding a container over their head in a kitchen ..

Alt: a person is holding an insulated container of liquid nitrogen. They pour the liquified gas over an open human hand in a lab setting. The Leidenfrost effect prevents any serious injury, as the liquid boils off before transferring much heat.

media.tenor.com

The Impact of Chirality on Singlet Fission and Triplet Fusion: A Molecular Twist for Photon Management

Chirality has recently emerged as a new means to profoundly impact the properties of organic semiconductors for spin-optoelectronic applications. Yet, a clear mechanistic understanding of chiral structure–property relationships remains absent to date, particularly for photon interconversion processes such as singlet exciton fission and triplet fusion. In this perspective, we highlight recent work that investigates chiral structures for these processes. We discuss the various ways in which chirality can impact such conversion processes and suggest ways to leverage it to improve photon management for both energy applications and quantum information science.

pubs.acs.org

Redox- and Protonation-Tunable Diboraheptacenes

Acenes are attractive molecular platforms with characteristic π-electron delocalization, resulting in exceptionally small HOMO–LUMO gaps, which makes them valuable for use in a variety of organic elec...

pubs.acs.org

Guest‐Induced Activation of Multicolor Photoluminescence in Naphthalene Bisimide Liquid Crystals

Supramolecular host–guest design in naphthalene bisimide liquid crystals activates charge-transfer emission and enables continuous tuning of color (511–685 nm) and lifetime, spanning prompt fluoresce...

advanced.onlinelibrary.wiley.com

Recrutement d'un ou d'une enseignant·e-chercheur·e contractuel·le en Chimie Chimie Organique des Systèmes Conjugués Electro-déficients - Université Angers

univ-angers.fr