ArticlePhysical chemistry chemical physics : PCCP2024
Electronic relaxation pathways in thio-acridone and thio-coumarin: two heavy-atom-free photosensitizers absorbing visible light.
Article in Physical chemistry chemical physics : PCCP, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Double Thionation of 4-Dimethylaminophthalimide Leads to the Development of a Highly Effective Photosensitizer.Chemistry (Weinheim an der Bergstrasse, Germany) · 2026Article
- Twisted Anthracene-Fused BODIPY: Intersystem Crossing and Torsion-Induced Non-Radiative Relaxation of the Singlet Excited State.Molecules (Basel, Switzerland) · 2026Article
- Effect of Thionation of the Carbonyl Groups in Naphthalimide-Phenoxazine Electron Donor-Acceptor Dyads on the Excited- State Dynamics: Transient Optical and Electron Paramagnetic Resonance Spectral Studies.Chemistry (Weinheim an der Bergstrasse, Germany) · 2025Article
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Authors and funding
9 authors.
Funding
Abstract
Heavy-atom-free photosensitizers (HAF-PSs) have emerged as a new class of photosensitizers aiming to broaden their applicability and versatility across various fields of the photodynamic therapy of cancers. The strategy involves replacing the exocyclic oxygen atoms of the carbonyl groups of established biocompatible organic fluorophores with sulfur, thereby bathochromically shifting their absorption spectra and enhancing their intersystem crossing efficiencies. Despite these advancements, the photophysical attributes and electronic relaxation mechanisms of many of these HAF-PSs remain inadequately elucidated. In this study, we investigate the excited state dynamics and photochemical properties of two promising HAF-PSs, thio-coumarin and thio-acridone. Employing a combination of steady-state and time-resolved techniques from femtoseconds to microseconds, coupled with quantum chemical calculations, we unravel the electronic relaxation mechanisms that give rise to the efficient population of long-lived and reactive triplet states in these HAF-PSs.
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