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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 September 2026 | Viewed by 7481

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 250 words) can be sent to the Editorial Office for assessment.

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-anonymized 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.

Related Special Issues

Published Papers (4 papers)

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Research

19 pages, 3893 KB  
Article
Micellar Pseudophase Effects and Chemometric Optimization in Photo-Fenton Degradation of Azo Dyes
by María José Gramaglia, Fernando Javier Arévalo, José Eduardo Natera, Walter Alfredo Massad and Gabriela Valeria Porcal
Photochem 2026, 6(3), 25; https://doi.org/10.3390/photochem6030025 - 21 Jul 2026
Viewed by 296
Abstract
This work investigates the photo-Fenton degradation of azo dyes in an aqueous medium rich in sodium dodecyl sulfate (SDS), using methyl orange (MO) as a model contaminant. Chemometric modeling was integrated with mechanistic analysis to elucidate the role of the micellar pseudophase in [...] Read more.
This work investigates the photo-Fenton degradation of azo dyes in an aqueous medium rich in sodium dodecyl sulfate (SDS), using methyl orange (MO) as a model contaminant. Chemometric modeling was integrated with mechanistic analysis to elucidate the role of the micellar pseudophase in radical distribution, dye partitioning, and overall reaction efficiency. A sequential experimental design strategy was applied, combining fractional factorial design and response surface methodology (RSM) to evaluate the individual and interactive effects of key operational variables and determine the optimal operating conditions for maximum degradation efficiency. Under optimized conditions (pH 2.85, [H2O2] = 100 mM, [Fe2+] = 0.5 mM, [SDS] = 13 mM, [MO] = 0.01 mM), MO degradation reached 98.4% in 5 min. Spectroscopic and partitioning studies revealed a strong affinity of MO for the micellar interface, indicating preferential localization in a microheterogeneous environment. Radical scavenging experiments confirmed that hydroxyl radicals are the dominant oxidizing species in water, while the reduction observed in the presence of SDS suggested secondary radical pathways derived from the surfactant under micellar conditions. Kinetic analyses highlighted the role of intermolecular interactions and micellar compartmentalization in radical generation. The optimized system was successfully extended to other azo dyes, underscoring the potential of surfactant-rich organized media to enhance photo-Fenton reactions in complex aqueous environments. Full article
(This article belongs to the Special Issue Feature Papers in Photochemistry, 3rd Edition)
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41 pages, 7193 KB  
Article
Nonlinear Optical Properties of Fe(II) and Ru(II) Alkynyl-Functionalized 1,3,5-Triphenyl-1,3,5-triazine-2,4,6-triones and 1,3,5-Triphenylbenzenes: Syntheses, Second-Harmonic Generation and Two-Photon Absorption
by Alexander Trujillo, Romain Veillard, Amédée Triadon, Guillaume Grelaud, Gilles Argouarch, Thierry Roisnel, Anu Singh, Isabelle Ledoux, Anissa Amar, Abdou Boucekkine, Marek Samoc, Katarzyna Matczyszyn, Xinwei Yang, Adam Barlow, Marie P. Cifuentes, Mahbod Morshedi, Mark G. Humphrey and Frédéric Paul
Photochem 2026, 6(1), 6; https://doi.org/10.3390/photochem6010006 - 21 Jan 2026
Viewed by 1467
Abstract
We report the use of σ-alkynyl d6 electron-rich transition metal complexes as electron-releasing end-groups in octupolar molecules designed for nonlinear optical (NLO) applications, specifically, N,N′,N″-triarylisocyanurates (5,7,8,10,12) [...] Read more.
We report the use of σ-alkynyl d6 electron-rich transition metal complexes as electron-releasing end-groups in octupolar molecules designed for nonlinear optical (NLO) applications, specifically, N,N′,N″-triarylisocyanurates (5,7,8,10,12) and 1,3,5-triarylbenzenes (6,9,11) functionalized by Fe(II) and Ru(II) organometallic moieties, and their NLO properties, as assessed by hyper-Rayleigh scattering (HRS) and Z-scan. The redox properties are briefly investigated through isolation of the corresponding Fe(III) trications 5[PF6]3 and 6[PF6]3. The second-harmonic generation (SHG) or two-photon absorption (2PA) performance of the Fe(II) and Ru(II) parents is compared with the help of TD-DFT calculations performed on models. Comparison with tris-ferrocenyl isocyanurate 4 reveals that the σ-connection of the metallic centers to the π-manifold is superior to the η5-connection for enhancing NLO properties. The positive effect of organometallic end-groups on NLO properties relative to purely organic electron-releasing substituents is established. The mechanism by which NLO enhancement occurs is complex and possibly connected to the polarizable π-electrons in the ligands surrounding the metal alkynyl units, but in most cases, the observed NLO enhancement must arise from the transition metal centers interacting with the central π-manifold. Full article
(This article belongs to the Special Issue Feature Papers in Photochemistry, 3rd Edition)
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22 pages, 4438 KB  
Article
Gold Nanoparticle-Mediated Delivery of Methylene Blue and INF: A Dual-Action Strategy Against Bacterial Resistance
by Begench Gurbandurdyyev, Berdimyrat Annamuradov, Justice ben Yosef, Yaran Allamyradov, Brayden Gross and Ali Oguz Er
Photochem 2025, 5(4), 40; https://doi.org/10.3390/photochem5040040 - 8 Dec 2025
Cited by 1 | Viewed by 1935
Abstract
Gold nanoparticles (AuNPs) synthesized via picosecond pulsed laser ablation were investigated as enhancers of methylene blue (MB)-mediated photodynamic therapy (PDT) against Escherichia coli. AuNPs produced at 532 and 1064 nm with frequencies of 20–50 kHz showed frequency- and size-dependent effects, with 50 kHz [...] Read more.
Gold nanoparticles (AuNPs) synthesized via picosecond pulsed laser ablation were investigated as enhancers of methylene blue (MB)-mediated photodynamic therapy (PDT) against Escherichia coli. AuNPs produced at 532 and 1064 nm with frequencies of 20–50 kHz showed frequency- and size-dependent effects, with 50 kHz yielding the highest particle concentrations and smaller particles enhancing reactive oxygen species (ROS) generation. UV-Vis and fluorescence spectroscopy confirmed nanoparticle formation and plasmonic properties consistent with TEM measurements. Photobleaching assays demonstrated that AuNPs significantly increased MB singlet oxygen generation, while the efflux pump inhibitor INF-55 further amplified bacterial killing without altering net ROS yield. In vitro assays revealed that INF-55 combined with MB/AuNPs achieved ~59% higher bacterial deactivation compared to MB/AuNPs alone. Molecular docking confirmed stronger binding of INF-55 to the AcrB efflux pump (−9.1 kcal/mol) than MB, supporting its role as a competitive inhibitor that promotes intracellular MB retention. These findings establish a dual-action PDT strategy in which AuNPs enhance ROS production and INF-55 augments antibacterial efficacy via efflux pump inhibition. Together, this platform provides a proof of concept for future translation to biofilm- and tissue-based infection models, and potentially to localized clinical applications such as prosthetic joint, catheter-associated, or chronic wound infections where conventional sterilization or systemic antibiotics are insufficient. Full article
(This article belongs to the Special Issue Feature Papers in Photochemistry, 3rd Edition)
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15 pages, 2389 KB  
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
Cited by 1 | Viewed by 2218
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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