Alejandro Cadranel

Breaking Kasha’s Rule to Enable Higher Reactivity in Photoredox Catalysis Nearly all photochemical transformations known to date follow Kasha’s rule, implying that reactions occur only from the lowest electronically excited state of a given spin multiplicity due to the fast...

We show how photoredox catalysis can bypass Kasha’s rule, enabling reactions from higher excited states.

This work, led by the exceptional @bjoernpfund.bsky.social, offers new insights into photochemical reactivity.

Published in JACS @jacs.acspublications.org

bit.ly/3IysmjX

Nature of Anti‐Dissipative High‐Energy Excited States in Quaterpyridine‐Bridged Ruthenium Complexes Upon photoexcitation, meta-connected quaterpyridine-bridged Ru complexes undergo fast inter-ligand electron transfer like typical chromophores, but unusually slow intra-ligand electron transfer withi...

Our in-depth study about how to avoid dissipation in solar-energy conversion w/ molecular chromophores is a HOT🔥paper @angewandtechemie.bsky.social @solarfau.bsky.social @fau.de In collab with fantastic @ludotroian.bsky.social & team - European WEAVE program
onlinelibrary.wiley.com/doi/full/10....

High-pressure pump–probe experiments reveal the mechanism of excited-state proton-coupled electron transfer and a shift from stepwise to concerted pathways Nature Chemistry - Chemical energy conversion and storage rely on the selective movement of protons and electrons, thus understanding these processes is important for applications. Now experiments...

This is a clever way to distinguish PCET from PT/ET pathways: using pressure.

ET/PT mechanisms lead to larger volume changes due to solvation of charged species.

@guldi-group.bsky.social @natchem.nature.com

rdcu.be/etauw

The next masterpiece from Matthias focusing on Coulombic dyads as new #photocatalyst class has been accepted in ACIE. Higher quantum yields in red-light catalysis by adding an inexpensive salt to use #Os as efficiently as possible. onlinelibrary.wiley.com/doi/10.1002/... @labheinze.bsky.social

Excited State Dynamics of Odd [n]Cumulenes: Chain Length and Conformational Effects Over the past decades, carbon allotropes have been extensively studied and applied to various technological applications due to their unique electronic and optical properties. Contemporary research ha...

Years in the making, finally published! Congrats Bob and Yanwen, and thanks for the great collaboration ‪‪@guldi-group.bsky.social‬!

Excited State Dynamics of Odd [n]Cumulenes
pubs.acs.org/doi/full/10....

A Near-Infrared-II Luminescent and Photoactive Vanadium(II) Complex with a 760 ns Excited State Lifetime Ruthenium and iridium are key components in the most important applications of photoactive complexes, namely, light-emitting devices, photocatalysis, bioimaging, biosensing, and photodynamic therapy. ...

Long-lived #excited states with non-precious transition metals? Check Alexandra’s paper on a polypyridine #vanadium complex. #luminescence and #photocatalysis in #water published in @jacs.acspublications.org
pubs.acs.org/doi/10.1021/jacs.5c04471 #ChemSky

Abundant Transition Metal Based Photocatalysts for Red Light‐Driven Photocatalysis We discussed here the recent developments on the abundant transition metal based photocatalysts and their applications in red light-driven photocatalysis.

Our review article on red light driven photocatalysis using abundant metal based photocatalysts is now online @ChemEurJ! Please have a look if you are interested in this topic. Many thanks to the reviewers.

doi.org/10.1002/chem...

YouTube video by Prof Nicolas Electronic Structure with Orca: Solvent Effects in the Calculation of IR Spectra

New video, on how explicit solvation affects calculation of vibrations and IR spectra. Please share, like, etc! It will be appreciated!
#compchem #chemsky #science

youtu.be/yqfIN0u2X3g

Molecular Design Principles for Photoactive Transition Metal Complexes: A Guide for “Photo-Motivated” Chemists Luminescence and photochemistry involve electronically excited states that are inherently unstable and therefore spontaneously decay to electronic ground states, in most cases by nonradiative energy release that generates heat. This energy dissipation can occur on a time scale of 100 fs (∼10–13 s) and usually needs to be slowed down to at least the nanosecond (∼10–9 s) time scale for luminescence and intermolecular photochemistry to occur. This is a challenging task with many different factors to consider. An alternative emerging strategy is to target dissociative excited states that lead to metal–ligand bond homolysis on the subnanosecond time scale to access synthetically useful radicals. Based on a thorough review at the most recent advances in the field, this article aims to provide a concise guide to obtaining luminescent and photochemically useful coordination compounds with d-block elements. We hope to encourage “photo-motivated” chemists who have been reluctant to apply their synthetic and other knowledge to photophysics and photochemistry, and we intend to stimulate new approaches to the synthetic control of excited state behavior.

A simple guide to the design of metal complexes in luminescence and photoredox catalysis.

With Giacomo Morselli and Christian Reber in JACS @jacs.acspublications.org

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

🚨 PhD Position Available! 🚨

Join our group at FAU as part of RTG 2861! 🎓🔬 We are looking for a PhD candidate to study carbon planar lattices via transient spectroscopies.

📌 Details & application: rtg2861-pcl.chm.tu-dresden.de/joboffer/

🔄 Retweets appreciated!

#chemsky #pisky #PhD #Spectroscopy

Two Birds, One Stone: Microsecond Dark Excited-State Lifetime and Large Cage Escape Yield Afforded by an Iron–Anthracene Molecular Dyad Iron photosensitizers represent a holy grail in photochemistry, but their widespread implementation is limited by their short excited-state lifetimes and poor cage escape yields. Here, the introductio...

Microsecond Dark Excited-State Lifetime and Large Cage Escape Yield Afforded by an Iron–Anthracene Molecular Dyad! Electron and energy transfer become accessible! Check out our latest work, spearheaded by the great Felix and Simon! Out in @acs.org pubs.acs.org/doi/full/10....

Iron(III) Complexes with Luminescence Lifetimes of up to 100 ns to Enhance Upconversion and Photocatalysis Iron is the most abundant transition metal element and would be the ideal replacement for noble metals in many applications that rely on luminescent and long-lived electronically excited states. We sh...

Iron(III) complexes with luminescence lifetimes as long as precious metal-based compounds

Utilization of an attached organic chromophore while maintaining a luminescent and photoactive LMCT excited state

Joel Wellauer & @bjoernpfund.bsky.social in JACS

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

Barrierless Electron Transfer in a Photosynthetic Reaction Center Model Ultrafast IR absorption spectroscopy was utilized to interrogate excited-state electron transfer in a strongly-coupled, cyanide-bridged photoinduced mixed-valent system. Despite structural asymmetry,...

Ultrafast IR spectroscopy of photoinduced mixed-valence systems reveals a fully delocalized Class III behavior in the excited state @fau.de @guldi-group.bsky.social
onlinelibrary.wiley.com/doi/full/10....

ICP2025 The 32nd International Conference on Photochemistry will take place from July 13 (Sunday) to July 18 (Friday), 2025 in Aachen (Germany). The event is jointly organized by the RWTH Aachen University…

Registration for the 32nd International Conference on Photochemistry is now open! Secure your spot at #ICP2025 and join us in Aachen for an exciting week of cutting-edge photochemistry.

Register now at 👉 www.icp2025.de

A very cool Bismuth MLCT chromophore with red-light photocatalytic activity. Fantastic collaboration!