Kasper S. Pedersen

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/...

🎉 Yesterday, Carl Emil Andersen defended his thesis entitled "Expanding the Field of Low- and Zero-Valent Metals in Metal-Organic Frameworks".

Thanks to Profs. @munzgroup.bsky.social (Saarland), Christine McKenzie (Univ. of Southern Denmark), and Martin Nielsen (DTU) for scrutinizing the thesis.

This includes in addition to 3D-ED, for instance, magnetometry, UV-vis-NIR, IR, fluorescence, EPR & NMR spectroscopy, and X-ray diffraction. 🧑‍🔬
Interested students should check out the course here: kurser.dtu.dk/course/26127

With this addition, we now offer a extensive portfolio of state-of-the-art techniques, leveraging some of the department's most advanced equipment to enhance students' hands-on experience in synthesizing and characterizing inorganic compounds and materials.

⚡ 💎 This year, we successfully integrated 3D electron diffraction into the curriculum for "26127 Experimental Inorganic Chemistry" at DTU Chemistry at the Technical University of Denmark — adding a powerful new tool to our teaching toolbox.

🎈The "2024 Pioneering Investigators" Feature Article by @majadunstan.bsky.social and me is highlighted in today's ChemComm!

"Valence tautomerism, non-innocence, and emergent magnetic phenomena in lanthanide-organic tessellations"

📖 Check it out here: pubs.rsc.org/en/content/a...

📣Join this group at the Technical University of Denmark👇🇩🇰

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/Candid...

Valence tautomerism, non-innocence, and emergent magnetic phenomena in lanthanide-organic tessellations Coordination networks based on lanthanide ions entangle collective magnetic phenomena, otherwise only observed in inorganic 4f materials, and the tunable spatial and electronic structure engineering i...

🎉 "2024 Pioneering Investigators" Feature Article out in ChemComm:

"Valence tautomerism, non-innocence, and emergent magnetic phenomena in lanthanide-organic tessellations"

We review recent results on 4f-organic tessellations with novel 🧲 and⚡properties.

🔗 pubs.rsc.org/en/content/a...

#chemsky

kasperpedersen.org

Hi #chemsky! 🧪
We are a synthetic inorganic chemistry group at the Technical University of Denmark, broadly interested in d- and f-block chemistry, framework materials, magnetism, crystallography, and synchrotron spectroscopy.
More info: www.kasperpedersen.org
Recent group photo👇 🧑‍🔬🇩🇰🇦🇺🇫🇷🇯🇵🇰🇿