Kasper S. Pedersen

🎉 Now out in JACS! @jacs.acspublications.org

Led by the Reinholdt group, we report a high-spin mixed-valent V=P=V complex with unusual electronic structure and bonding.
Check it out here 👇

🔗https://pubs.acs.org/doi/10.1021/jacs.5c20647

💫 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 Sunday, March 1 ⏰

iccc2026.com

#MOFs #coordinationchemistry

for Mn, yes, but the material is not overly interesting from a magnetism/transport perspective. The Tc analogue would likely be very interesting (and not Tc(II)?), but that is out of reach of most people :) If you are interested, feel free to drop me an email.

Interplay of Redox Non-Innocence and Symmetry Breaking in a 4d Coordination Framework Incorporating 4d and 5d metal ions into coordination frameworks offers a powerful route to quantum materials where orbital delocalization and spin–orbit coupling reshape magnetic and electronic ground states. However, such systems remain difficult to access synthetically. Here we report Mo(pyz)2I2, the first pyrazine-bridged square-lattice framework featuring a paramagnetic 4d metal center, obtained using a new organometallic precursor route that enables Mo incorporation. Structural and spectroscopic data establish a MoIII({pyz2}•–)I2 formulation and reveal pronounced ligand redox non-innocence accompanied by local symmetry breaking arising from a disordered distribution of neutral and reduced pyrazine linkers─the first experimental observation of local symmetry lowering in a pyrazine-based coordination solid. Magnetic measurements show strong antiferromagnetic interactions without clear evidence of long-range order, and electrical transport indicates narrow-gap semiconducting behavior. Extending pyrazine framework chemistry to the 4d block thus requires new synthetic strategies and reveals new local structural and magnetic degrees of freedom, positioning Mo(pyz)2I2 as a prototype for designing correlated and spin–orbit-entangled states in molecule-based quantum materials based on heavier transition metals.

pubs.acs.org/doi/10.1021/...

Just out in @jacs.acspublications.org:
"Interplay of Redox Non-Innocence and Symmetry Breaking in a 4d Coordination Framework"

🧪We’ve made Mo(pyz)₂I₂, the 4d cousin of the Cr(pyz)₂X₂ family—with redox-active ligands, symmetry breaking, semiconducting transport, and strong magnetic interactions.
🔗👇

Thanks! For now we’ll settle for d-orbitals rather than extra dimensions 🤪

Interplay of Redox Non-Innocence and Symmetry Breaking in a 4d Coordination Framework Incorporating 4d and 5d metal ions into coordination frameworks offers a powerful route to quantum materials where orbital delocalization and spin–orbit coupling reshape magnetic and electronic ground...

chemrxiv.org/engage/chemr...

👋New preprint: "Interplay of Redox Non-Innocence and Symmetry Breaking in a 4d Coordination Framework"

🧪We’ve made Mo(pyz)₂I₂, the 4d cousin of the Cr(pyz)₂X₂ family — with redox-active ligands, symmetry breaking, semiconducting transport, and very strong magnetic interactions.

🔗👇

💫 Open PhD position in synthetic lanthanide and actinide chemistry, with a focus on switchable materials, at DTU Chemistry! 🇩🇰 🧪

🔗 Learn more and apply here: efzu.fa.em2.oraclecloud.com/hcmUI/Candid...

⏰ Deadline: November 30

Check out our recent work here: www.kasperpedersen.org

🎓 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.
🌐 www.conferencemanager.dk/ecmm

#ECMMCopenhagen #MolecularMagnetism #Copenhagen

High-Temperature Compensated Ferrimagnetism in the Molecular Framework Cr(pyrazine)3 Molecule-based analogues of perovskites hold promise for emergent electronic and magnetic phenomena, yet examples with sufficiently strong correlations remain elusive. We report the synthesis of Cr(py...

👉 chemrxiv.org/engage/chemr...

🧪 Simplicity engineered for magnetism 🧲

📢 Preprint: Cr(pyrazine)₃ - maybe the simplest MOF with potential voids known. Built from Cr(III) + radical pyrazine linkers, this perovskite analogue shows magnetic interactions rivaling the strongest known in inorganic materials, stabilizing order above RT.

📣 New preprint: "4f-intermediate valence in an ytterbium–bipyridine coordination solid"

chemrxiv.org/engage/chemr...

We report exp. evidence for a multiconfigurational electronic ground state in a ytterbocene-based 1D polymer - the first example of intermediate valence in a coordination solid. ⚛️

Congratulations, David!! 🎉

🎉 Just out in Nature Comm @natcomms.nature.com

"Unleashing phosphorus mononitride"

👉 www.nature.com/articles/s41...

Spearheaded by the Reinholdt group (Lund), we find that the elusive P≡N molecule finds new life in an Os complex and unlocks unique [NPS₂]²⁻, [NPCl]⁻, and aromatic [PN₄]⁻ species.

Honored to receive the 2025 Bjerrum Gold Medal 🏅 for "outstanding contributions to inorganic and coordination chemistry", awarded at the Danish Chemical Society Annual Meeting.
Pictured with Niels J. Bjerrum, grandson of the celebrated chemist Niels J. Bjerrum.

www.kemi.dtu.dk/english/nyhe...

⏰ Only three more days to apply for an open PhD position in lanthanide and actinide chemistry, with a focus on switchable materials, at DTU Chemistry! 🇩🇰 🧪

🔗 Learn more and apply here: efzu.fa.em2.oraclecloud.com/hcmUI/Candid...

📖 You can explore our recent work here: www.kasperpedersen.org

PhD scholarship in switchable f-block–organic framework materials - DTU Chemistry PhD scholarship in switchable f-block–organic framework materials. The PhD project will focus on the design, synthesis, and characterization of new types of metal-organic network structures, which inc...

👋 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/Candid...

📅 Deadline: May 30
📖 Find our recent work here: www.kasperpedersen.org/articles/

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-organic) van der Waals crystals, where molecular alloying can drive complete and temperature-tunable

💡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,

Molecular alloying drives valence change in a van der Waals antiferromagnet Engineering van der Waals (vdW) crystals leverages control of the confinement and transport of charge, spin, and heat in 2D atomic layers. This study introduces a new function by altering valence stat...

🎉 Just out in Chem! @cp-chem.bsky.social

"Molecular alloying drives valence change in a van der Waals antiferromagnet"

👉 See: www.cell.com/chem/abstrac...

for materials synthesis, and lots of electron, (high-pressure) X-ray, and neutron diffraction and spectroscopy, magnetism and transport.

🧑‍🔬 Anton Viborg, @majadunstan.bsky.social, Nathan Yutronkie, Amit Chanda, Felix Trier, Nini Pryds, Fabrice Wilhelm, Andrei Rogalev, @pinkowiczgroup.bsky.social

🏛 DTU Chemistry, DTU Energy, ESRF - The European Synchrotron, Jagiellonian University
💰 Villum Fonden, Independent Research Fund Denmark

pubs.rsc.org/en/content/a...

🎉 Our latest research on valence tautomerism in 4f-organic materials is now out in @chemicalscience.rsc.org

We explore the factors driving conversion temperature, cooperativity, thermodynamics, and the magnetic & conductive properties of this fascinating, new class of materials. 🧲⚡

Read it here🔓👇

❄️ Our recent paper on sub-Kelvin magnetic refrigeration in a frustrated Eu(II)-organic network is featured in this week's issue of JACS 📖

Check out the paper here: pubs.acs.org/doi/10.1021/...

#ChemSky

👋Our department at the Technical University of Denmark is looking for an assistant/associate professor in *any* chemical discipline! 🧪🇩🇰

Check it out and feel free to get in touch 💬

👇
efzu.fa.em2.oraclecloud.com/hcmUI/Candid...

📣📣PhD Position available in Inorganic Chemistry at the University of Southern Denmark📣📣

🗓️Application Deadline: 5 March (23:59 CET)

🔁Reposts appreciated

👇👇See Below for more information and to apply👇👇
fa-eosd-saasfaprod1.fa.ocs.oraclecloud.com/hcmUI/Candid...

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

🎉 New sub-Kelvin cool paper out in the Journal of the American Chemical Society❄️❄️

"A Triangular Frustrated Eu(II)–Organic Framework for Sub-Kelvin Magnetic Refrigeration"

👉 pubs.acs.org/doi/10.1021/...