Article
Chemistry, Applied
Mingyang Li, Yao Du, Haitao Zhan, Luhang Zhang, Hujian Wu, Dawei Zhao, Qi Wang, Tao Wang
Summary: In this study, we synthesized five novel flavonol camphorsulfonates (HFSs) photoinitiators based on a flavonol scaffold. These HFSs exhibited excellent photoinitiating properties in both one-component and two-component photoinitiating systems, resulting in high conversion and fast polymerization rates in acrylates. Furthermore, the HFSs showed thermal stability in thermogravimetric tests. Various complementary methods were used to explain the photoinitiating mechanisms, including real-time FT-IR spectroscopy, UV-Vis absorption spectroscopy, fluorescence spectroscopy, analysis of photolysis products, cyclic voltammetry, free radical capture experiments, and molecular modelling calculations.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Chemistry, Applied
Yujie Qi, Xing Huang, Haoqi Zhai, Mengquan Shi, Yuxi Zhang, Yunlong Zhang, Yuxia Zhao
Summary: Lignin model compounds containing C alpha-carbonyl beta-O-4 structure unit were synthesized and characterized, and their photoinitiation efficiency was evaluated. F4 showed the best performance as a one-component photoinitiator, equivalent to a commercial two-component system. The photolysis mechanism of F4 and the generated active species under light irradiation were also identified.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Chemistry, Applied
X. D. Guo, H. Y. Zhou, J. X. Wang
Summary: The novel bifunctional photoinitiator TX-EG-IPDI-2959, containing thioxanthone and hydroxyalkylphenone moieties, demonstrates efficient photolysis and polymerization under visible light irradiation. The intramolecular synergistic effect between the two moieties enhances reaction efficiency.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Chemistry, Applied
Can Xu, Shang Gong, Xiang Wu, Yuwei Wu, Qiuyan Liao, Ying Xiong, Zhen Li, Hongding Tang
Summary: The development of carbazole-based photo-bleachable dyes as free radical initiators for visible light polymerization showed promising results in effectively initiating the photopolymerization of thick materials. Carbazole-based dyes like CM-2 and CI-2 demonstrated better free radical initiating efficiencies and successful polymerization of thick films under visible light irradiation. These findings suggest great potential for deep photocuring of thick materials using these dyes.
Article
Polymer Science
Jingfang Li, Hongwei Lu, Hao Zheng, Xianju Zhou, Jun Nie, Xiaoqun Zhu
Summary: By isomerizing E,Z-BPC back to E,E-BPC through heating, a thermally activated system for free radical photopolymerization was developed. The intra-molecular hydrogen bonding of N-H center dot center dot center dot O=C in E,Z-BPC also contributes to its stability at room temperature under sunlight irradiation in presence of TEOA.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Xinyue Guo, Weijie Wang, Decheng Wan, Ming Jin
Summary: Three novel oxime esters based on the pi-conjugated trans-stilbene group were synthesized as photoinitiators for LED photopolymerization, exhibiting good absorption and efficient photoinitiation properties under LED irradiation. The photolysis rates and free radical generation quantum yields of the PIs increase from polar to nonpolar solvents, with the D-pi-A type OXE-S showing a significant increase in photolysis rate from acetonitrile to toluene. These PIs have great potential in photocuring applications.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Chemistry, Physical
Rong Zhong, Hui Hu, Yanfang Zhou
Summary: The novel photoinitiator showed good photoinitiating activity and thermal stability compared to commercial photoinitiators, with lower migration of the residual photoinitiator in the cured film.
Article
Chemistry, Applied
Yi Zhu, Lun Li, Yuchao Zhang, Yang Ou, Jingyan Zhang, Yusuf Yagci, Ren Liu
Summary: This work reports the synthesis and characterization of sulfonium salt photoinitiators (PIs) with a coumarin skeleton. The photochemical and photophysical properties of the PIs were investigated through spectroscopic and computational investigations. The PIs showed excellent photolysis and initiating efficiency for various photopolymerization reactions without any additives in the UV and visible regions. The solubility and activity of the active species could be controlled by adjusting the length of the aliphatic chain on the sulfur atom. These PIs are anticipated to have broad applications in photopolymerization processes.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Chemistry, Physical
Liqiang Li, Di Zhu, Xiaotong Peng, Pu Xiao
Summary: Photopolymerization is popular for its mild reaction conditions and controllability, but concerns about the leachability of photoinitiators have risen. A novel polymerizable photoinitiator was designed in this study, showing excellent migration stability and potential applications in biomedical and food packaging industries.
Article
Chemistry, Multidisciplinary
Yi Zhu, Dandan Xu, Yuchao Zhang, Yufan Zhou, Yusuf Yagci, Ren Liu
Summary: The novel photoinitiator P-PTh possesses broad wavelength absorption capabilities in the UV, visible, and near-IR regions, allowing it to efficiently initiate polymerization reactions at different wavelengths. This flexibility may lead to novel pathways in curing applications for pigment systems.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Christine Elian, Benjamin Mourot, Camil Benbouziyane, Jean-Pierre Malval, Sonia Lajnef, Fabienne Peyrot, Florian Massuyeau, Olivier Siri, Denis Jacquemin, Simon Pascal, Davy-Louis Versace
Summary: In this study, a near-infrared-absorbing heptamethine compound incorporating bulky benzo[cd]indole heterocycles was designed to prevent self-aggregation of the dye. Compared to a reference system, the incorporation of the heterocycles resulted in a significantly enhanced photoinitiating reactivity. The researchers achieved a 100% conversion of acrylates C=C bonds even under air conditions by incorporating the near-infrared sensitizer into a three-component system, which allowed for self-regeneration of the photoredox cycle. This cycle was thoroughly investigated by identifying the intermediates using EPR spectroscopy.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Tung-Liang Huang, Yung-Chung Chen
Summary: In this study, novel visible light one-component photoinitiators based on benzophenone scaffold were synthesized, showing improved UV-Vis absorption regions and thermal properties. The free radical generation and chemical reaction mechanisms of these photoinitiators were confirmed. The photopolymerization experiments demonstrated the enhanced photosensitivity and improved optical and thermal properties of the synthesized compounds.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Polymer Science
Antonela Gallastegui, Maria Emilia Zambroni, Carlos A. Chesta, Rodrigo E. Palacios, Maria Lorena Gomez
Summary: The research focused on developing novel water-soluble eco-friendly hybrid photoinitiator systems, which showed higher polymerization rates and versatility in photopolymerization applications.
Review
Polymer Science
Ameya Jagtap, Aarti More
Summary: Photopolymerization is a polymerization reaction that utilizes a light source to form active species and follow the conventional polymerization process. The key component in this system is the photoinitiator, which governs the curing rate by absorbing radiation and initiating the reaction.
Review
Polymer Science
Nicolas Giacoletto, Malika Ibrahim-Ouali, Frederic Dumur
Summary: The development of photoinitiating systems activable in the visible and near-infrared region is an active research field, with squaraine dyes serving as relevant examples that offer various absorption wavelengths to revolutionize the scope of photopolymerization applications.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Chemistry, Physical
Wiem Bouali, Muejgan Yaman, Nurgul Seferogu, Zeynel Seferogu
Summary: Novel chemosensors, including coumarin hydrazide, were synthesized and demonstrated the ability to detect cyanide ions through absorption and fluorescence turn-off response. The reaction mechanism between the sensors and the ions was determined through experimental and theoretical studies. The sensors exhibited high detection ability and effectiveness.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Parinaz Abdollahian, Hassan Heidari, Soheila Hassanzadeh, Mohammad Hasanzadeh
Summary: This study successfully synthesized various types of thiolated-graphene quantum dots (GQDs) and utilized them in a one-droplet microfluidic paper-based analytical device for the simultaneous multi-sensing of heavy metal ions. The GQDs were functionalized and stabilized on the surface of hydrophobic fiber-glass, enabling colorimetric chemosensing of ions including iron, copper, cobalt, mercury, chrome, manganese, and nickel. The results were confirmed using fluorescence spectrometry, and the platform showed potential for facile metal ion detection in human urine models and environmental fluids.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
S. L. Barrett, C. Meyer, E. Cwiklik, V Fieglein, M. Burns, J. Guerrero, W. J. Brittain
Summary: Laboratory illumination is strong enough to create a photostationary state (PSS) of amphiphilic azo-benzene compounds in water. The [cis]PSS/[trans]PSS ratios were observed to be 0.33-1.2 in D2O and 0.37-3.8 in dimethyl sulfoxide-d6. ortho-Fluoroazobenzene amphiphiles show higher cis-isomer concentration at equilibrium compared to non-fluorinated compounds due to differences in optical absorption profiles. The kinetics of isomerization were measured using UV-Vis spectroscopy and the ratio of trans-to-cis rates does not directly correlate with the observed PSS. The half-life for PSS formation is 40 minutes for fluorinated compounds and 80 minutes for non-fluorinated compounds.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Jalil Khodayari, Karim Zare, Omid Moradi, Mohammadreza Kalaee, Niyaz Mohammad Mahmoodi
Summary: In this study, an eco-friendly biocomposite (CMC/MIL/CuO) was synthesized and characterized, and its ability to decolorize Acid Blue 92 dye was investigated. The results showed that CMC/MIL/CuO can be used as a suitable photocatalyst for dye decolorization.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Bo Ma, Qian Xu, Huajun Yao, Yalin Chen, Yiyang Wang, Yunfei Yang, Hongfang Shen, Youjun Lu
Summary: This study designed an integrated structure of Cu2O@Au/Cu2O heterostructure particles, which achieved significantly enhanced photocatalytic performance by simultaneously considering the integrated structural characteristics and localized surface plasmon resonance (LSPR) effect. Experimental characterization and theoretical simulation confirmed the three-in-one synergy of the integrated heterostructure, including the LSPR effect of Au nanoparticles, the light scattering based on core-shell heterostructure, and the effective charge separation based on inter-embedded heterostructure. The concept of integrated heterostructure cooperated with LSPR effect provides a new strategy for designing future catalysts.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Robert G. H. Marks, Sarah P. Rockel, Klaus Kerpen, Holger Somnitz, Philipp R. Martin, Maik A. Jochmann, Torsten C. Schmidt
Summary: This study investigated the pH-dependent photolysis of phosphonates in aqueous solutions and analyzed the transformation products. The results showed that the photolysis rate of phosphonates was influenced by pH and light conditions. Furthermore, the carbon kinetic isotope effects varied for different types of phosphonates.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
T. M. Naren Vidaarth, S. Surendhiran, K. S. G. Jagan, S. Savitha, K. S. Balu, A. Karthik, B. Kalpana
Summary: In this study, magnesium oxide nanoparticles were synthesized using plant seed extracts, which exhibited excellent performance in removing dyes from textile water bodies. These nanoparticles also showed strong antibacterial and antioxidant properties.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Mikhail Yu. Ovchinnikov, Vyacheslav A. Antipin, Sergey L. Khursan
Summary: In this study, the recombination of separated ion-radical states (SIRS) in PAPh films was analyzed, and it was found that the contribution of X-SIRS recombination to total luminescence varies with different environments. It was also shown that the recombination of labile SIRS is independent of the nature of the atmosphere. The study theoretically substantiated that SIRS recombination can occur via the transfer of both positive and negative charges, and the efficiency of thermal activation of recombination processes depends on the ratio of radiant and conductive channels of energy transfer.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Sumaira Naeem, Tayyaba Mubashir, Mudassir Hussain Tahir, Jawayria Najeeb, Ahmed Z. Dewidar, Hosam O. El-ansary, Silas Lagat, Anthony Pembere
Summary: This study presents an alternative methodology using machine learning for the selection of novel organic molecules to develop high-performance organic solar cell devices.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
D. Thirumoolan, S. Ragupathy, S. Renukadevi, P. Rajkumar, Rajakumar S. Rai, R. M. Saravana Kumar, Imran Hasan, Mani Durai, Young-Ho Ahn
Summary: In this study, the photodegradation of brilliant green dye was studied in relation to the comparative photocatalytic activity of pure ZnO and Ni-doped ZnO/CSAC. The Ni-doped ZnO/CSAC showed a higher photocatalytic degradation rate under visible light irradiation, suggesting its potential as an effective wastewater treatment material.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Ajmal Khan, Zhidong Chang, Wenjun Li, Xiaohui Ma, Mei Dong, Liang Geng, Ghulam Yasin, Shuaib Khan, Hira Anwar
Summary: Due to its functional structure and tunable shape, 2D zeolitic imidazole framework (ZIFs) have gained significant interest in various fields. In this study, thin ZIF-8 sheets were prepared using a mixed solvent and then delaminated into single layers through physical sonication. These hexagonal sheets exhibited high stability and controlled morphology, and showed excellent performance in dye degradation compared to 3D ZIF-8 crystals.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Vitaly A. Podshibyakin, Evgenii N. Shepelenko, Leonid D. Popov, Tatyana M. Valova, Anton O. Ayt, Lyudmila G. Kuzmina, Anton V. Lisovin, Oleg N. Burov, Mikhail E. Kletskii, Alexander D. Dubonosov, Vladimir A. Bren
Summary: Bifunctional hybrids containing photochromic indolyl(thienyl) diarylethenes and an ionochromic rhodamine moiety connected by a dimethylene spacer were synthesized. These hybrids exhibit absorption at 450-455 nm and fluorescence at 560 nm in toluene. UV light triggers ring-closed non-fluorescent diarylethene formation, which can be reversed under visible light or in the dark. In the presence of H+ cation, a naked eye effect is observed with the opening of the rhodamine-spirolactam ring and a pink-crimson coloration at 561 nm accompanied by intense long-wavelength emission at 586 nm. This process is reversible by exposure to triethylamine, as confirmed by NMR experiments. The light-induced isomerizations and proton-induced transformations were explained using computational methods. Reversible switching of fluorescent properties can be achieved by light irradiation and proton.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Majid Sharifi-Rad, Hazem S. Elshafie, Pawel Pohl
Summary: The study investigated the synthesis of silver nanoparticles using Lallemantia royleana leaf extract, characterized their physico-chemical properties, and evaluated their biopharmaceutical and catalytic applications. The synthesized nanoparticles showed good stability and exhibited higher antioxidant, antimicrobial, anti-inflammatory, anti-arthritic, and cytotoxic activities compared to the leaf extract. These results provide a promising green synthesis route for silver nanoparticles with potential biomedical and catalytic applications.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Meera Moydeen Abdul Hameed, Badr M. Thamer
Summary: Security encoding using photochromism is an effective method for creating authentication substrates. A unique photochromic ink has been developed that emits light continuously under UV rays and darkness. The ink is produced by dispersing lanthanidedoped aluminate nanoparticles in a polymer binder. The resulting composite ink can be used to create transparent films on paper, and the stamped patterns become visible under UV rays, changing from colorless to green.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Monika Lamoria, Rita Kakkar, Marilyn Daisy Milton
Summary: Four novel water-soluble benzimidazolium and bis-benzimidazolium salts with a fluorophore-spacer-receptor design were synthesized and demonstrated to selectively detect Fe3+ ions with large Stokes shifts. The binding mechanism and detection performance were investigated through theoretical and experimental studies.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)