Simon Pascal

Je crois que je me vois, coin de la régie à gauche, à faire du stop avec les bigoudènes, oh !

Les coûts cachés de l’open — TheMetaNews Pour les chercheur·ses qui viennent de terminer la rédaction d’un article après plusieurs mois, voire années, de dur labeur, c’est le moment très satisfaisant… de sortir la carte bleue. En effet, depu...

« Les coûts cachés de l'open [access] » — un bon résumé de la situation complexe, dans @themeta.news themeta.news/les-couts-ca...

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.

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...

Thanks Tatiana !

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.

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 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.

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

Poke @d84ka.bsky.social

Picture of the end of the HDR defense of Yoann Cotelle with the jury.

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 !

Exciting research and now exciting news: Tatiana, who carried out most of this work, has just joined Bluesky!
Follow her for more on quinones and dyes: @tatianamunteanu.bsky.social

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.

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)

Vous souhaitez communiquer vos derniers résultats ? Visitez notre page consacrée aux manifestations en chimie organique organisées par la communauté française : new.societechimiquedefrance.fr/divisions/ch...

JCO are back!!! 29-31 October 2025 - Palaiseau - École Polytechnique. To know more visit our website : jco2025.com

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.

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

Hi Matthieu, I would be happy to join the group, thanks !

For fellow chemists, journals downgraded from level 1 to level 0 by the Finnish Publication Forum include: Molecules (the historical one), IJMS, Polymers or Cancers...
see full list here:

julkaisufoorumi.fi/sites/defaul...

Thèse soutenue ! Merci à toutes les personnes sans qui ça n'aurait pas été possible ☀️

Chimistes 🇫🇷 : si vous êtes chimiste français ou francophone ou basé en France, et que vous voulez être ajouté à une petite liste de la communauté, faites signe 👋 bsky.app/profile/did:...

🤘🏼

Coupled Polymethine Dyes: Six Decades of Discoveries This review delves into the coupling principle of polymethines, first introduced by Dähne and Leupold in 1966, which narrows the optical gap of coupled polymethine dyes. Compiling decades of research...

Here is a properly working link to access the review:
shorturl.at/N6bGl
Plus, it is on HAL !

Historical development of Coupled Polymethine Dyes and notable structures.

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