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Stefano Crespi

@screspi.bsky.social
1.2K followers 361 following 15 posts

Assistant Professor in Organic Photochemistry at Uppsala University Editor of the Journal of Molecular Structure

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Reposted by Stefano Crespi
George Williams @gtwsuprachem.bsky.social · 01/07/2026
Really pleased to see our work on using rotaxanes to tune photoswitching out now! Great work by my first PhD student Alex and the group, with some amazing computational insight by @screspi.bsky.social and the team! onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com
Mechanically Interlocked Indigo Photoswitches
By incorporating indigo photoswitches into the axle of a rotaxane, which features a hydrogen bonding macrocycle, we demonstrate improvement in activation wavelength, photostationary states and therma...
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Johannes Walker @johanneswalker.bsky.social · 22/06/2026
Particularly thanks to Marius who made the original observation of the selectivity and to @screspi.bsky.social and Jorn Steen for the calculations that support the stereochemical model to explain the selectivity.
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Stefano Crespi @screspi.bsky.social · 20/02/2026
Check out our latest publication in @angewandtechemie.bsky.social where we show that the infamous V shape in the substituent effects in the thermal isomerization of azobenzenes comes from a single nonadiabatic mechanism 🔥 and not a mix of two. onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com
The Nonadiabatic Nature of the Substituent Effects in Azobenzene
Unified nonadiabatic switching: thermal Z→E isomerization of para-substituted azobenzenes proceeds through a single nonadiabatic rotational pathway. The iconic bell-shaped Hammett plot is a σp artifa...
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George Williams @gtwsuprachem.bsky.social · 30/01/2026
Dead excited to share our preprint showcasing some of the effects of incorporating indigo photoswitches into rotaxanes Fantastic work by Alex, and great to be working with @screspi.bsky.social and co! chemrxiv.org/doi/full/10....
Cartoon representation of an indigo photoswitch in a rotaxane
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Stefano Crespi @screspi.bsky.social · 19/11/2025
Proud of being recipient of the first Nagel Prize in Chemistry ⚗️ from @scienceacademyswe.bsky.social www.kva.se/nyheter/tva-...
kva.se
Två yngre kemister tilldelas första Nagelska priset - Kungl. Vetenskapsakademien
Kungl. Vetenskapsakademien tilldelar Eleni Stavrinidou, Linköpings universitet, och Stefano Crespi, Uppsala universitet, det allra första Nagelska priset i kemi. Det handlar om en miljon kronor varder...
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Tanja Weil @weilgroup.bsky.social · 24/07/2025
We developed an AND-gated chemiluminescent photosensitizer that only generates light inside tumor cells, activating under 2 cancer cell-specific conditions. Many thanks to Wenwu Peng @pengww.bsky.social from Seah Ling Kuan's group @seahling.bsky.social & our collaborators! shorturl.at/uXTg3
pubs.acs.org
Autonomous Activation of a Gated Chemiluminescent Photosensitizer Enables Targeted Photodynamic Therapy in Tumor Cells
Chemiluminescence-based photodynamic therapy (CLPDT) offers a promising solution to the light penetration limits of traditional PDT. However, it lacks spatiotemporal control. Intracellularly activated...
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Stefano Crespi @screspi.bsky.social · 21/07/2025
Our pipeline to compute thermal barriers of photoswitches💡 is out!🥳 We especially focused on NBDs for MOST🔋 and imines, but also stilbenes and DAEs. Try it out! You need just chemdraws and freeware to get libraries computed doi.org/10.1002/cptc...
doi.org
Semi‐Automated Pipeline for Transition State Search of Molecular Photoswitches
A semi-automated pipeline for the transition state search of molecular switches (PiTS3) is reported, which facilitates the search, optimization, and conformational analysis of transition states of ph...
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Fredrik Schaufelberger @fschaufelberger.bsky.social · 05/06/2025
Over the moon that the first paper from Anja's studies on metal chelate rotaxanes is now online in @angewandtechemie.bsky.social. doi.org/10.1002/anie... Massive congratulations Anja, @daisypooler.bsky.social Huseyn, Monika and @screspi.bsky.social 🥳🎉🎊🍀🥃 Thread below --》
doi.org
Modulation of Lanthanide Luminescence with the Mechanical Bond: Antenna‐Emitter Confinement in a Compact [2]Rotaxane
Luminescent emitters based on lanthanide ions are of ubiquitous importance in the biological sciences, but typically need sensitisation from a covalently attached adjacent chromophore – an “antenna” ....
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Stefano Crespi @screspi.bsky.social · 19/04/2025
Mati's work on aldehyde and COOH effect on HTIs is out! Nice collaboration with the Ott group for the inclusion and switching of HTIs in MOFs💡 doi.org/10.1002/chem...
doi.org
The Effect of Aldehyde and Carboxylic Acid Substitution on the Isomerization of Hemithioindigo Photoswitches
Hemithioindigo (HTI) photoswitches exhibit robust photoisomerization under visible light and relatively high thermal bistability. In this work, we report various modifications of the HTI core, namely....
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KoenigChemistry @chemistrykoenig.bsky.social · 16/01/2025
Tert-butylamine as a labile ligand and base enables cross-coupling reactions with various nucleophile classes. A great collaboration of Jonas with the Sigman lab and Gschwind group #ChemSky #ChemCollabs #photocatalysis doi.org/10.1021/acsc...
doi.org
Cross-Coupling Reactions with Nickel, Visible Light, and tert-Butylamine as a Bifunctional Additive
Transition metal catalysis is crucial for the synthesis of complex molecules, with ligands and bases playing a pivotal role in optimizing cross-coupling reactions. Despite advancements in ligand desig...
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Ivan Aprahamian @aprahamian.bsky.social · 16/01/2025
Reposting this #molswitch #molmachine starter pack. If you want to be included in it, please let me know go.bsky.app/EwimNbK
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Matthieu Sollogoub @msollogoub.bsky.social · 06/01/2025
Here is a tentative Supramolecular Chemistry starter kit. Please let me know if you wish to be added ! #ChemSky go.bsky.app/RjRgi6n
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Stefano Crespi @screspi.bsky.social · 26/12/2024
Great to be highlighted by @chemistryviews.bsky.social! Go pnictogen switches 😀 💡
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ChemistryViews @chemistryviews.bsky.social · 26/12/2024
Molecular Switch with a Variety of External Triggers: Reversible molecular switching of a phosphaethene polyaromatic hydrocarbon by irradiation, metal coordination, or deprotonation www.chemistryviews.org/molecular-sw...
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Stefano Crespi @screspi.bsky.social · 24/12/2024
Another C=P switch💡🅿️, this time with a metal twist 😀 great collaboration with @orthaberlab.bsky.social
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Steve Cranford @cranfordmatter.bsky.social · 13/12/2024
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Waser Group @lcsolab.bsky.social · 05/12/2024
Our OrgChem Starter Pack is growing with already 122 entries, but we will start a volume 2 if we go over the 150 limit! go.bsky.app/NSEFPFJ
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Orthaber Lab @orthaberlab.bsky.social · 04/12/2024
Absolutely delighted to see the light of this collaborative work between the @screspi.bsky.social team and our group, with all the spectroscopy help. Demonstrating degenerate isomerisation of phosphaalkenes using NMR spectroscopy #chemsky #NMRchat onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com
Probing the Hidden Photoisomerization of a Symmetric Phosphaalkene Switch
In this study, we present the synthesis and analysis of a novel, air-stable, and solvent-resistant phosphaalkene switch. Using this symmetric switch, we have demonstrated degenerate photoisomerizatio...
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Stefano Crespi @screspi.bsky.social · 03/12/2024
Hey #Chemsky! For my first post, I am hyped to share our latest efforts on main group C=P photoswitches💡, where we explored their isomerization mechanisms and observed experimentally symmetric molecules switch via NMR!🧲🔍a great international collaboration! onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com
Probing the Hidden Photoisomerization of a Symmetric Phosphaalkene Switch
In this study, we present the synthesis and analysis of a novel, air-stable, and solvent-resistant phosphaalkene switch. Using this symmetric switch, we have demonstrated degenerate photoisomerizatio...
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Reposted by Stefano Crespi
Harmit Singh Malik @harmitmalik.bsky.social · 26/11/2024
You ever have one of those amazing weeks when everything clicks in your multiple roles as an academic PI- scientist, mentor, parent, partner, colleague, psychologist, fundraiser, salesperson? (Yeah, me neither.) But screwing up each of these roles takes special talent. (I am that talented.)
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Kjell Jorner @valencekjell.com · 21/11/2024
What better first post than to advertise this position. Come join our group! Our group is recruiting a postdoctoral researcher for a project on reactive machine learning potentials. Reposts and spreading the word to interested people in your network appreciated! jobs.ethz.ch/job/view/JOP...
jobs.ethz.ch
Postdoc position in reactive machine learning potentials
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Ivan Aprahamian @aprahamian.bsky.social · 21/11/2024
Here is a starter pack for folks into tiny switches and machines. I am sure I missed many. Please let me know if you should be included and I will add you go.bsky.app/EwimNbK
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Lisa Vondung @lisavondung.bsky.social · 19/11/2024
Would you like to spend the next summer in beautiful Hamburg doing some uranium chemistry? If you're an undergraduate student from the UK, Ireland or North America, you have 11 days left to apply for two fully funded research internships via the DAAD: www.daad.de/rise/en/rise... #chemsky
The Elbphilharmonie building in Hamburg surrounded by the Elbe river with blue skies and a few clouds. Canal with houses and people on stand up paddling boards queuing at a waterside café Summer day at the Alster lake in Hamburg with people on stand up paddling boards and a sailing boat
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