Well-Structured Narrow Near-Infrared Absorption Based on Nonaggregated Hexarylene-Bisimide toward a Colorless Dye Extended π-conjugated systems are often insoluble, and their aggregation manner greatly affects their absorption spectra. This study produced a planar, soluble, and nonaggregated hexarylene-bisimide (HB) with appropriate substituents. The single-crystal X-ray structure of HB confirmed the planar molecular structure with small twist angles and the dimerization behavior of HB in the solid state. The concentration-dependent 1H NMR experiments in CDCl3 indicated that the association constant Kdimer is 4.6 × 103 M–1 at 298 K and ΔGdimer (298 K) = −20.8 kJ mol–1. The longest absorption of HB at the monomeric state exhibits a sharp and intense peak at 921 nm (ε = 230,000 M–1 cm–1, full width at half-maximum = 718 cm–1) in toluene. 75% of the absorption of HB above 400 nm appears in the near-infrared region, thus giving a practically colorless solution. Magnetic circular dichroism spectra of a series of oligorylene-bisimides reveal the predominant contribution of the linear polyene-like conjugation over the annulene-like conjugation for larger [n]oligorylene-bisimides.

Well-Structured Narrow Near-Infrared Absorption Based on Nonaggregated Hexarylene-Bisimide toward a Colorless Dye | The Journal of Organic Chemistry pubs.acs.org/doi/10.1021/... #PiSky

Synthesis and Photophysical Analysis of Amphiphilic Azobenzene Surfactants for Photomechanical Actuation Subtle electronic modifications of tailored amphiphilic azobenzene derivatives exhibit distinct cis-state half-lives despite similar activation barriers. The structural functionalization enables the ...

Small electronic tweaks → big differences: cis-state half-lives diverge despite similar activation barriers. Their dual solubility makes them photomechanical surfactants, showing distinct behavior in oil-in-water vs water-in-oil emulsions. 🌊☀️🛢️
doi.org/10.1002/ejoc...

FRET Materials for Biosensing and Bioimaging Förster resonance energy transfer (FRET) spectroscopy and microscopy are constantly expanding sensing techniques for analyzing biomolecular interactions. In addition to the biological recognition mole...

Okay. Let's start my Bluesky adventure with posting our recent FRET materials review: Chemical Reviews pubs.acs.org/doi/10.1021/...

And for anyone who is interested in Theodor Förster's life and career before, during, and after National Socialism in Germany, we recently published this Viewpoint article in Angewandte Chemie - onlinelibrary.wiley.com/doi/10.1002/...

We’re excited to welcome James Batteas (Texas A&M) as an invited speaker at #INCOME2025 in Berlin! His group explores how precise mechanical forces can drive reactions in dry solids—making synthesis safer, more efficient & sustainable. Don’t miss his talk! #mechanochemistry 👉 tinyurl.com/35b77vfm

Please retweet! We are looking for highly committed scientists with an individual scientific research career plan. You will work in an excellent consortium and have top research conditions. Work share is 80-20, that is you have one day per week to work on your own ideas.

we are still happy to receive abstracts - meet us in Hawaii

Understanding Electron Beam-Induced Chemical Polymerization Processes of Small Organic Molecules Using Operando Liquid-Phase Transmission Electron Microscopy Electron beams evolved as important tools for modern technologies that construct and analyze nanoscale architectures. While electron–matter interactions at atomic and macro scales are well-studied, a ...

Our 2. paper of this year is out: Understanding Electron Beam-Induced Chemical Polymerization Processes of Small Organic Molecules Using Operando Liquid-Phase Transmission Electron Microscopy | ACS Nano pubs.acs.org/doi/10.1021/...

I am super exited to share the publication hashtag#openaccess of our paper “Automated Research Platform for Development of Triplet−Triplet Annihilation Photon Upconversion Systems” published in
@acs.org Central Science

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

We have updated our "Chemical Neuroscience" course to include pentameric ligand-gated channels and the first GPCRs. www.traunergroup.org/teaching

Ion Mobility Mass Spectrometry to Probe Sequences in Supramolecular Copolymers The analysis of the microstructure of supramolecular copolymers is difficult because of their dynamic character. Here, benzene-1,3,5-tricarboxamide (BTA) co-assemblies are analysed by ion mobility - ...

Glad to join #chemsky and share our latest work on probing the sequence of supramolecular polymers with ion mobility / mass spectrometry! Great colloboration between @ipcm-sorbonne.bsky.social @univevry.bsky.social and UMons. Open access in @angewandtechemie.bsky.social doi.org/10.1002/anie...

Listening to the Formation of Polymorphs in a Ball Mill In this contribution, we apply our newly developed ball-milling operando platform, which combines Raman spectroscopy and thermal (IR) imaging, as well as acoustic and high-speed optical video recordings, to the synthesis and transformation of citric acid–isonicotinamide (1:2) cocrystal polymorphs in transparent PMMA jars. Particularly, we demonstrate how Raman, temperature, acoustic, and video data are complementary and enable detection and connection of chemical and physical events happening during ball-milling in a time-resolved manner. Importantly, we show that the formation of the three cocrystal polymorphs can be detected through acoustic analyses solely. Even more impressively, the meticulous analyses of the sound data allowed subtle polymorphic transitions to be perceived in operando mode when the Raman spectroscopy was not conclusive enough. Such changes in sound signatures are greatly linked to the beads’ motions in the milling jar. A new data analysis methodology of acoustic recordings is proposed through a combination of energetic and statistical approaches that simplifies the data analyses for potential users. The interpretation of the detected sound signals was further validated thanks to the high-speed videos recorded in synchronization with all other operando techniques. Finally, we broaden this acoustic methodology to opaque stainless-steel jars, showing the relevance of the acoustic analysis method for following polymorphic transformations of cocrystals, as well as pure substances, in any type of milling jar.

Cool and creative work from Cesar Leroy and team from @cnrs.bsky.social at@icgmmontpellier.bsky.social. I saw the setup while visting Montpellier last year - in short, you can follow the reaction progress through sound changes during the mixing in the ball mill. doi.org/10.1021/acs....

Year-one highlights January 2025 marks one year since the launch of Nature Chemical Engineering.

🎉 January 2025 marks one year since the launch of Nature Chemical Engineering.

To commemorate our first anniversary, we have curated a collection of highlights from the first 12 issues. We hope you enjoy exploring the list! #ChemSky #Physics

www.nature.com/collections/...

Hello! Just created an account on Bluesky. A chemist believing the power of molecules. Synthetic chemistry, molecular nanocarbon science, catalysis, and chemical biology. Be unique, go crazy, be happy!

Trapping Anions within Stacks of Tetra-Urea Macrocycles Designing molecular receptors that bind anions in water is a significant challenge, and an even greater difficulty lies in using these receptors to remove anions from water without resorting to the ha...

Trapping anions within stacks of macrocycles pubs.acs.org/doi/10.1021/.... Collaboration between UTS, Sydney, Xiamen, Aveiro, Glasgow and Bristol. Well done and thanks to everyone involved. By forming aggregates with anions in water we can get chromate levels down to acceptable levels by filtration.

a man in a suit stands in front of a microphone and says this is the start of your career Alt: a man in a suit speaks into a microphone and says, 'this is the start of your career'

🚨New job opening 🚨

Hey #Chemsky, we have an opening for an editor on the cross-journal team to handle papers in organic chemistry & related fields

📍 Shanghai, Beijing, Heidelberg or Berlin
🗓️ Closing date: Feb 4th
❔ DMs open if you have questions

www.nature.com/naturecareer...

Here is a tentative Supramolecular Chemistry starter kit. Please let me know if you wish to be added ! #ChemSky
go.bsky.app/RjRgi6n

1st paper of 2025 is a fact: Turns out, adding gas bubbles can boost photon absorption in photoreactors by scattering and intensifying light intensity.

🔗 React Chem Eng: pubs.rsc.org/en/content/a...

🙌: @jhaschuurmans.bsky.social, Stefan, Arnab, Miguel, John & @tnoel82.bsky.social

#flowchemistry

This is big! @prash-singh.bsky.social and co-workers have uncovered how bacterial flagella switch direction: This breakthrough advances our understanding of bacterial movement and chemotaxis, and nanomachine design principles! #Microbiology #ScienceNews #nanotechnology #nanomachine

Molecular Drillers for 2 nm Resolution Nanochannel Perforation of 2D Nanoplates Perpendicular nanochannel creation of two-dimensional (2D) nanostructures requires highly controlled anisotropic drilling processes of the entire structure via void formation. However, chemical approa...

First publication of the year 2025 is out: We studied Lewis acid base conjugates as Molecular Drillers for the Perforation of 2D Nanoplates with 2-nm Nanochannel Resolution| Journal of the American Chemical Society @acspublications.bsky.social
pubs.acs.org/doi/10.1021/...

It's a team effort together with Gregory Schneider (Leiden University) and Xinliang Feng (MPI Halle), so hot results and thrilling research are highly expected. Looking forward to applications. Please retweet/resky

Hi there: we're happy to be on BlueSky now, too! Stay tuned as we're getting set up here for the #ChemSky community - more to follow soon!

Photoconductance Induced by Excited‐State Intramolecular Proton Transfer (ESIPT) in Single‐Molecule Junctions Single-molecule electrical measurement of excited-state intramolecular proton transfer (ESIPT) photocycle reveals the dynamic process of photoconductance under different irradiation wavelengths. The ...

Photoconductance Induced by Excited-State Intramolecular Proton Transfer (ESIPT) in Single-Molecule Junctions by Y. Li, B. Xiao et al.

onlinelibrary.wiley.com/doi/10.1002/...

Left: A blue butterfly on a blue background; right: The Chemistry Europe logo and "We're on BlueSky" in white on a black background.

Hello world: we're happy to be on BlueSky now, too! Stay tuned as we're getting set up here for the #ChemSky community - more to follow soon!

#Crystal structure of an intercalated #porphyrin dimer which is stable in solution.

Let's start our #chemsky journey: Congratulations to #LiamCribbin #TCDChemistry on his 1st paper now out in #BJOC @BeilsteinInstitut.hessen.social.ap.brid.gy
"C–C Coupling in sterically demanding #porphyrin environments" doi.org/10.3762/bjoc... funded by @researchireland.bsky.social (PORPHYSHAPE)

We are moving one step closer to our goal to develop a general method to red-shift photoswitchable ligands as a foundation for in vivo photopharmacology with our latest work: "A platform for the development of highly red-shifted azobenzenes". Link: doi.org/10.26434/che....

Non-equilibrium Steady States in Catalysis, Molecular Motors, and Supramolecular Materials: Why Networks and Language Matter All chemists are familiar with the idea that, at equilibrium steady state, the relative concentrations of species present in a system are predicted by the corresponding equilibrium constants, which are related to the free energy differences between the system components. There is also no net flux between species, no matter how complicated the reaction network. Achieving and harnessing non-equilibrium steady states, by coupling a reaction network to a second spontaneous chemical process, has been the subject of work in several disciplines, including the operation of molecular motors, the assembly of supramolecular materials, and strategies in enantioselective catalysis. We juxtapose these linked fields to highlight their common features and challenges as well as some common misconceptions that may be serving to stymie progress.

Considering the diverse backgrounds of my new followers, I'll share here a perspective I co-wrote with Steve Goldup about kinetic assymetry, and it's pivotal role in designing meaningful #out-of-equilibrium systems - including life itself! :) pubs.acs.org/doi/10.1021/...
#ChemSky 🧪⚗️

Exceptions, Paradoxes, and Their Resolutions in Chemical Reactivity Progress in chemistry has primarily been framed through inductive processes, leading to the frequent emergence of exceptions and unexpected reactivities. These anomalies─ranging from surprising reacti...

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

Excited to share our newest paper in
@JMaterChem C on multilayer films for photon upconversion-driven photoswitching!
A super cool collaborative project lead by Rachel Evans
@cambridgeuni.bsky.social

#TTAUC🌈
#photoswitch↔️
pubs.rsc.org/en/Content/A...