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Photochem
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Feature Papers in Photochemistry, 3rd Edition
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Feature Papers in Photochemistry, 3rd Edition

A special issue of Photochem (ISSN 2673-7256).

Deadline for manuscript submissions: 30 November 2025 | Viewed by 852

Special Issue Editor

Prof. Dr. Marcelo Guzman

E-Mail Website
Guest Editor
Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
Interests: environmental photochemistry; interfacial oxidations; environmental monitoring; prebiotic chemistry; photocatalytic CO2 reduction; environmental chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Following the success of the previous Special Issue, it is our pleasure to announce a new Special Issue, “Feature Papers in Photochemistry, 3rd Edition”. This Special Issue is designed to publish high-quality papers in Photochem, a journal dedicated to recent advances in the research area of photochemistry. This Special Issue engages in, but is not limited to, the following topics: interactions of UV, as well as visible and IR radiation with molecules and materials. Photochemistry has important associations across a wide spectrum of science, including physics, organic and inorganic chemistry, catalysis, materials science, biology, and medicine.

This Special Issue will present a collection of both research articles and review articles highlighting interesting results in the field of photochemistry.

Prof. Dr. Marcelo Guzman
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photochem is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • photocatalysis
  • photoreduction
  • photochemical electron transfer
  • visible or solar light
  • water and wastewater treatment
  • gaseous pollutant removal
  • energy conversion
  • spectroscopy

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Further information on MDPI's Special Issue policies can be found here.

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Published Papers (1 paper)

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Research

15 pages, 2389 KiB  
Article
Tracking Photoinduced Charge Redistribution in a Cu(I) Diimine Donor–Bridge–Acceptor System with Time-Resolved Infrared Spectroscopy
by Sean A. Roget, Wade C. Henke, Maxwell Taub, Pyosang Kim, Jonathan T. Yarranton, Xiaosong Li, Karen L. Mulfort and Lin X. Chen
Photochem 2025, 5(2), 16; https://doi.org/10.3390/photochem5020016 - 19 Jun 2025
Viewed by 357
Abstract
Understanding electron density migration along excited-state pathways in photochemical systems is critical for optimizing solar energy conversion processes. In this study, we investigate photoinduced electron transfer (PET) in a covalently linked donor–bridge–acceptor (D-B-A) system, where [Cu(I)-bis(1,10-phenanthroline)]+ acts as an electron donor, and [...] Read more.
Understanding electron density migration along excited-state pathways in photochemical systems is critical for optimizing solar energy conversion processes. In this study, we investigate photoinduced electron transfer (PET) in a covalently linked donor–bridge–acceptor (D-B-A) system, where [Cu(I)-bis(1,10-phenanthroline)]+ acts as an electron donor, and anthraquinone, tethered to one of the phenanthroline ligands via a vibrationally active ethyne bridge, behaves as an electron acceptor. Visible transient absorption spectroscopy revealed the dynamic processes occurring in the excited state, including PET to the acceptor species. This was indicated by the spectral features of the anthraquinone radical anion that appeared on a timescale of 30 ps in polar solvents. Time-resolved infrared (TRIR) spectroscopy of the alkyne vibration (CC stretch) of the ethyne bridge provided insight into electronic structural changes in the metal-to-ligand charge transfer (MLCT) state and along the PET reaction coordinate. The observed spectral shift and enhanced transition dipole moment of the CC stretch demonstrated that there was already partial delocalization to the anthraquinone acceptor following MLCT excitation, verified by DFT calculations. An additional excited-state TRIR signal unrelated to the vibrational mode highlighted delocalization between the phenanthroline ligands in the MLCT state. This signal decayed and the CC stretch narrowed and shifted towards the ground-state frequency following PET, indicating a degree of localization onto the acceptor species. This study experimentally elucidates charge redistribution during PET in a Cu(I) diimine D-B-A system, yielding important information on the ligand design for optimizing PET reactions. Full article
(This article belongs to the Special Issue Feature Papers in Photochemistry, 3rd Edition)
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