Simon Pascal
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pascalsci.bsky.social
Simon Pascal
@pascalsci.bsky.social
140 followers 220 following 14 posts
Chemist-Photophysicist, CNRS researcher, CEISAM, Nantes University, France
🌈Design of charged, zwitterionic and coordinated near-infrared dyes
🎸Also, bedroom musician, stompboxes addict 🦶
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pascalsci.bsky.social
Post-doctoral position at CEISAM lab in Nantes !

Join to synthesize near-infrared dyes and design next-gen solar cells, within the Connect Talent TRANSCEND project funded by Région Pays de la Loire, Nantes Métropole & @cnrs.fr.

Deadline: Sept. 23rd
Apply here: emploi.cnrs.fr/Offres/CDD/U...
Description of the post-doctoral position in molecular chemistry proposed by Dr S. Pascal at the CEISAM laboratory and funded by the Connect’ Talent program of the Pays de la Loire region.
September 2, 2025 at 8:38 AM
pascalsci.bsky.social
What began as an unexpected color change years ago led us to a rare discovery: a metastable macrocycle with two Meisenheimer adducts, fueled by cyanide and stabilized by H-bonds.
A study from CINaM (@univ-amu.fr) & CEISAM (Nantes Univ), now OA in @angewandtechemie.bsky.social :
tinyurl.com/a65eekm8
A tetranitroazacalixarene macrocycle captures cyanide reversibly via nucleophiloic aromatic substitution to form a metastable dianionic bis-Meisenheimer complex, with a color change of the solution from yellow to orange.
August 26, 2025 at 9:21 AM
pascalsci.bsky.social
New chapter in the coupled polymethines story:
we explored anionic & neutral dyes, with exciting photophysics (e.g., pH-switching via spirocyclization of a dianionic species 🤯)
A joint study from CINaM (@univ-amu.fr) & CEISAM (Nantes Univ) labs, now OA in @orgchemfront.rsc.org:
tinyurl.com/58kudd4j
A colorfoul scheme of anionic coupled polymethine dyes and their neutral precursors, uncovering a range of exciting photophysical behaviors: including ESIPT, photoacid emission, and NIR pH-switching.
July 7, 2025 at 1:38 PM
pascalsci.bsky.social
Big congrats to Dr Yoann Cotelle (iSm2, Marseille) who brilliantly defended his HDR today, a great day for supramolecular chemistry, and a perfect reason to gather a remarkable jury !
Picture of the end of the HDR defense of Yoann Cotelle with the jury.
June 27, 2025 at 2:16 PM
pascalsci.bsky.social
How far can we push quinones into the NIR while keeping them ultra-light?
Our latest dye, synthesized by Tatiana Munteanu (CINaM, @univ-amu.fr) and modeled by Carmelo Naim (CEISAM, Nantes Univ.), reaches nearly 700 nm with MW < 300 Da!
Read more: shorturl.at/dhlHM
(@rsc.org & @orgbiomolchem.rsc.org)
Scheme of a far-red absorbing cationic benzoquinone diimine dye and plot of its absorption spectrum, with a picture of the dye dissolved in dichloromethane solution.
February 26, 2025 at 11:08 AM
pascalsci.bsky.social
Our latest work explores new reactivities of benzoquinone-monoimines, including the one-step synthesis of bis-zwitterionic macrocycles via transamination.

A joint study from @univ-amu.fr (CINaM), Nantes Université (CEISAM), & Univ. Politehnica of Bucharest.

Here in J. Org. Chem.: shorturl.at/mUBii
This is the cover of the Journal J. Org. Chem. from January 2025. The cover juxtaposes the molecular structures of your bis-zwitterionic macrocycles against a stunning mountainous landscape, creating a striking symmetry. The molecular orbitals and bonds seem to mirror the rugged peaks and valleys of the mountains, suggesting a connection between the natural world and the precision of molecular design.
January 28, 2025 at 9:20 AM
pascalsci.bsky.social
Hi Bluesky, bringing some color your way !
To start, we dove into 60+ years of Coupled Polymethines research, piecing together the colorful puzzle of these remarkable dyes.
Check out our review in The Chemical Record: shorturl.at/aYwg
Historical development of Coupled Polymethine Dyes and notable structures.
November 13, 2024 at 7:01 AM