Kasper S. Pedersen

🎉 Now in @NatureChemistry! Tunable valence tautomerism in lanthanide-organic alloys 👉 nature.com/articles/s4155… We report a complete, abrupt, hysteretic, and fully reversible valence change transition in a samarium-based coordination solid. 🧵Read more below👇

💫 Quantum Phenomena and Emergent Properties in MOFs ⚛️ is a symposium at the International Conference on Coordination Chemistry in 🇩🇰 this summer, organized by myself and Lars Öhrström. 🏃‍We welcome submissions for oral contributions by March 1 ⏰ iccc2026.com

🎓 Early Announcement: The 10th European Conference on Molecular Magnetism (ECMM 2026) will be held in Copenhagen, Denmark — Aug 17–20, 2026. Plenary & keynote talks + great opportunities for early-career researchers. 🌐 conferencemanager.dk/ecmm #ECMMCopenhagen #MolecularMagnetism

🧪 Simplicity engineered for magnetism 🧲 📢 Preprint: Cr(pyrazine)₃ - maybe the simplest MOF with potential voids known. This perovskite analogue shows magnetic interactions rivaling the strongest known in inorganic materials, stabilizing magnetic order above RT. 🔗and🎥👇

@mauperfetti @OrgMetallics @J_A_C_S @LeonardoTaccon1 @matteobriganti2 @RazaArsen @GroupSlageren @lorenzo_tesi @UNI_FIRENZE @ERC_Research Congratulations! 🎉

Spin electric effect and its anisotropy on a chiral Dy complex @J_A_C_S. Many thanks to @LeonardoTaccon1 for his stamina. @matteobriganti2 @RazaArsen @GroupSlageren, @lorenzo_tesi @UNI_FIRENZE @ERC_Research is always cool! pubs.acs.org/doi/10.1021/ja…

Proposals for symposia for the next International Conference on Coordination Chemistry June 2026 can be submitted at iccc2026.com

👋 We are excited to share an open PhD position in 4f/5f chemistry, with a focus on switchable materials, at the Technical University of Denmark!🧪🇩🇰 🔗 See more and apply here: efzu.fa.em2.oraclecloud.com/hcmUI/Candidat… 📅 Deadline: May 30 📖 Find our recent work here: kasperpedersen.org/articles/

temperature-tunable valence change transitions from parent materials that do not display any valence change transition themselves.

dramatically altering the materials’ magnetization and electrical conductivity by up to five orders of magnitude. This work establishes a new paradigm in the manipulation of (metal-organicI van der Waals crystals, where molecular alloying can drive complete and

💡In short: By leveraging molecular alloying, we've discovered a novel mechanism to control valence changes in a layered metal-organic material. Specifically, by alloying aliovalent Cr(pyrazine)I2 and Cr(pyrazine)2Br2, we can switch between Cr(II) and Cr(III) states thermally,

🎉 Just out in Chem! "Molecular alloying drives valence change in a van der Waals antiferromagnet" 👉 See: cell.com/chem/abstract/… for materials synthesis, and lots of electron, (high-pressure) X-ray, and neutron diffraction and spectroscopy, magnetism and transport.

👋Our department at the Technical University of Denmark is looking for a Tenure Track Assistant/Associate Professor in *any* chemical discipline! 🧪🇩🇰 Check it out and feel free to get in touch 💬☕️ 👇 efzu.fa.em2.oraclecloud.com/hcmUI/Candidat… @Chemjobber

We dive into the potential of a chemically and structurally unique Eu(II)–organic net as a cutting-edge refrigerant for sub-K temperatures. Leveraging geometric frustration to prevent magnetic ordering, this material achieves remarkable efficiency in ultra-low-T environments.

🎉 New sub-Kelvin cool paper out in @J_A_C_S ❄️❄️ "A Triangular Frustrated Eu(II)–Organic Framework for Sub-Kelvin Magnetic Refrigeration" 👉 pubs.acs.org/doi/10.1021/ja…

📣Join this group at @DTUtweet👇🇩🇰 We have an open 2-year postdoc position on MOFs with metallic cluster nodes. Excellent skills in synthetic chemistry and crystallography are key. Read more and apply here: efzu.fa.em2.oraclecloud.com/hcmUI/Candidat…

Like many other, I am now also on @bluesky 🦋with the same handle: @kasperspedersen.bsky.social

All are welcome to attend in Copenhagen! 🧲🇩🇰

📣New review preprint! "Valence tautomerism, non-innocence, and emergent magnetic phenomena in lanthanide-organic tessellations" (link below) A journey through lanthanide-organic tessellations, towards cooperative, quantitative, f-block valence tautomerism 🧲

Thanks to just-graduated PhD @AnnaSManvell, and @majdunstan, David Gracia, @JakubHruby33, @MariuszKubus, @McPhersonJN, Elias Palacios, Høgni Weihe, Stephen Hill, Jürgen Schnack, and @MarEvaCre !

📣New sub-Kelvin cool preprint❄️ chemrxiv.org/engage/chemrxi… A triangular Eu(II)-pyrazine net templated by large Ba2+. The ensuing frustration prevents entropy-annihilating magnetic order down to at least 0.17 K - a remarkably low working temperature for a magnetic refrigerant.🥶