Article
Chemistry, Multidisciplinary
Yu-Ying Jiang, Hui Liu, Ting Li, Kun Zhang, Peng-Fu Gao, Meng-Shu Zhou, Li-Lei Zhang, Hong-Ru Fu
Summary: Controlling molecular packing has a significant impact on the aggregate states and optoelectronic characteristics. In this study, two coordination polymers with different molecular packing modes were synthesized through coordination-driven self-assembly. It was found that the molecular packing mode has a profound effect on the emission characteristics. Compound 1, which features a monomer packing mode, exhibits both blue fluorescence and ultralong phosphorescence at room temperature, while compound 2, which lacks phosphorescence, shows excimer-dominated green fluorescence emission.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Organic
Daniel Pecorari, Andrea Mazzanti, Stefano Gianvittorio, Simone Foschi, Stefano Stagni, Valentina Fiorini, Michele Mancinelli
Summary: The stereodynamic properties of amino bis-mesityl-boranes bearing carbazole and benzocarbazole as donor heterocycles were investigated through dynamic NMR analysis and DFT calculations. Different pi-contributions to the B-N bond were found for the two series, leading to pronounced variations in the fluorescence spectra.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Spectroscopy
Wenbin Hu, Mingyue Fan, Xian-Fu Zhang, Mengmeng Li, Guoying Li
Summary: meso-RNH substituted BODIPY compounds with different substituents (R = C3H7, C4H9, PhCH2, H, and Ph) were synthesized to investigate their photophysical properties and photosensitizing abilities. UV-vis absorption, fluorescence spectroscopy, laser flash photolysis, and chemical trapping methods were employed to measure various parameters. The results show that the presence of meso-RNH leads to blue shift of absorption and emission wavelength, decrease in fluorescence quantum yield and lifetime, and increase in singlet oxygen formation. The mechanisms include photoinduced charge transfer, S0 and S1 geometry, and ground state structural isomerization. These findings are valuable for designing new functional materials.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Paola Zimmermann Crocomo, Takahito Kaihara, Soki Kawaguchi, Patrycja Stachelek, Satoshi Minakata, Piotr de Silva, Przemyslaw Data, Youhei Takeda
Summary: Novel electron donor-acceptor-donor compounds were designed and synthesized with dibenzo[a,j]phenazine as the central acceptor core and two 7-membered diarylamines as the donors. Slight structural modification led to unique photophysical behavior, including dual emission from room-temperature phosphorescence and triplet-triplet annihilation, as revealed by physicochemical analysis and quantum chemical calculations. Electrochemical analysis suggested sigma-dimer formation and electrochemical polymerization on the electrode.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Applied
Shin-ichi Kondo, Shiori Abe, Hiroshi Katagiri
Summary: Cyclosiloxanes containing 1-naphthyl and 5-substituted naphthyl groups were prepared from silanediols using bases as catalysts. The selectivity for the synthesis of cyclotrisiloxanes and cyclotetrasiloxanes can be controlled by substituents and base strength. Electron-donating groups give kinetically controlled cyclo-trisiloxane, while electron-withdrawing groups give thermodynamically stable cyclotetrasiloxane.
Article
Chemistry, Applied
Pei-Ting Li, Nian-Sheng Xu, Wen-Wen Li, Chun-Lin Sun, Zi-Fa Shi, Xiao-Ping Cao, Hao-Li Zhang
Summary: In this study, a series of alpha-cyano-1,4-diphenylbutadiene derivatives containing triphenylamine structure were designed and synthesized. By changing the connection mode, the fluorescent wavelengths of the compounds were further regulated.
Article
Chemistry, Multidisciplinary
Meng Lv, Xicun Lu, Yanrong Jiang, Maria E. Sandoval-Salinas, David Casanova, Haitao Sun, Zhenrong Sun, Jianhua Xu, Youjun Yang, Jinquan Chen
Summary: The study focuses on enhancing triplet generation efficiency and uncovering the mechanism of intersystem crossing by designing spiro-compounds. By fine-tuning the energy levels between spiro-charge transfer and high energy states, near-unity triplet generation quantum yield was achieved.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Applied
Ying Zeng, Xiangxiang Zhai, Guangming Wang, Yuming Su, Minjian Wu, Biaobing Wang, Kaka Zhang
Summary: Organic afterglow materials, featuring small rate constants of key photophysical processes, such as phosphorescence decay and nonradiative decay of triplet excited states, have become an important class of luminescent materials. The transformation of afterglow mechanism from room-temperature phosphorescence to thermally-activated delayed fluorescence in intramolecular charge transfer systems has been reported. This transformation is achieved by increasing the acceptor strength of the ICT molecules, reducing singlet-triplet splitting energy, and enabling reverse intersystem crossing pathway to harvest triplet energies. These findings provide deep understanding of the behaviors of organic triplets with small photophysical rate constants. In addition, these organic ICT molecules have shown promising applications when incorporated into aqueous emulsion systems.
Article
Nanoscience & Nanotechnology
Thanh B. Nguyen, Hajime Nakanotani, Chin-Yiu Chan, Shunta Kakumachi, Chihaya Adachi
Summary: A proof of concept was presented for maximizing the TTU contribution yield in blue OLEDs through the doping of TADF molecules. The bipolar carrier transport ability of TADF materials enables direct carrier recombination on the molecules, expanding the recombination zone. Although the external electroluminescence quantum efficiency of OLEDs is slightly lower, the TTU efficiency approaches the upper limit. Furthermore, by employing TADF molecules, the operational device lifetime of OLEDs increased by five times, highlighting the importance of expanding the recombination zone for enhancing overall OLED performance in TTU-OLEDs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Guangming Wang, Xuefeng Chen, Jiahui Liu, Shuhui Ding, Kaka Zhang
Summary: By incorporating advanced charge transfer (CT) technology, we designed difluoroboron beta-diketonate (BF(2)bdk) CT compounds with moderate singlet-triplet splitting energy and relatively large spin-orbit coupling matrix elements, achieving efficient intersystem crossing (ISC) and moderate rates of reverse intersystem crossing (RISC). The organic matrices suppress nonradiative decay of BF(2)bdk's T-1 states, leading to high afterglow efficiency, long lifetimes, and excellent processability for TADF-type organic afterglow materials.
SCIENCE CHINA-CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Xi Chen, Noreen Rehmat, Ivan V. Kurganskii, Partha Maity, Ayhan Elmali, Jianzhang Zhao, Ahmet Karatay, Omar F. Mohammed, Matvey V. Fedin
Summary: Bodipy (BDP)-perylenebisimide (PBI) donor-acceptor dyads/triad were synthesized to investigate the spin-orbit charge-transfer intersystem crossing (SOCT-ISC). Different quantum yields of singlet oxygen were observed for the dyads/triad, and various processes including FRET, CS, CR, and TTET were observed in the excited state dynamics. Time-resolved electron paramagnetic resonance spectroscopy revealed the involvement of both radical pair ISC and SOCT-ISC in the intersystem crossing. The triad BDP-PBI-2 showed an unusual electron spin polarization pattern of (e, e, e, e, e, e) in the triplet state formed via the RP ISC mechanism.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Takayoshi Tonami, Hajime Miyamoto, Masayoshi Nakano, Ryohei Kishi, Yasutaka Kitagawa
Summary: Singlet fission (SF) occurs when a singlet exciton state is converted into a double-triplet exciton state through interactions with nuclear motions. In this study, the effects of static disorder on SF in pentacene crystal models were investigated using quantum dynamics simulation and classical molecular mechanics/molecular dynamics. It was found that static disorder accelerates the relaxation pathways from singlet exciton to double-triplet exciton through faster decay of coherence between the states.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Organic
Anissa Beghennou, Geoffrey Gontard, Heloise Dossmann, Kevin Passador, Serge Thorimbert, Vincent Corce, Candice Botuha
Summary: Efficient synthesis of original 1,6-naphthyridin-7(6H)-ones and their optical properties, including dual fluorescence, solvatochromism, acidochromism, large Stokes shifts, and high quantum yields, are described in this study. These properties make them suitable for biological applications or as luminescent devices in materials science.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Article
Optics
Mikhail A. Panfilov, Tatyana Yu. Karogodina, Yao Songyin, Oleg Yu. Karmatskih, Alexey Yu. Vorob'ev, Irina S. Tretyakova, Evgeni M. Glebov, Alexander E. Moskalensky
Summary: This paper extends the library of possible modifications of BODIPYs by presenting experimental data and quantum chemical calculations for a new family of meso-substituted BODIPYs with nitrophenyl groups. The optical properties of the novel compounds are characterized and it is shown that the fluorescence quantum yield and singlet oxygen generation efficiency vary significantly within the family. The experimental data presented in this paper may be useful for further designing of BODIPY dyes and NO photodonors.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Physical
Sergi Vela, Alberto Fabrizio, Ksenia R. Briling, Clemence Corminboeuf
Summary: Machine learning techniques have shown accuracy in retrieving electronic excited state properties of large molecular databases at a reduced computational cost. Learning fundamental quantum objects may be a more efficient alternative for extracting various molecular properties.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Biochemistry & Molecular Biology
Giusy Tassone, Marco Paolino, Cecilia Pozzi, Annalisa Reale, Laura Salvini, Gianluca Giorgi, Maurizio Orlandini, Federico Galvagni, Stefano Mangani, Xuchun Yang, Benedetta Carlotti, Fausto Ortica, Loredana Latterini, Massimo Olivucci, Andrea Cappelli
Summary: The use of Morita-Baylis-Hillman adducts allows for facile site-specific, irreversible, and diastereoselective click-functionalization of a lysine residue, producing an unnatural chromophore with an extended pi-system within a lipophilic binding pocket. This approach opens up the possibility of in vitro preparation of a library of synthetic proteins structurally reminiscent of xanthopsin eubacterial photoreceptors, expanding the scope of optogenetic and lab-on-a-molecule tools introduced by rhodopsin mimics.
Article
Chemistry, Multidisciplinary
Letizia Mencaroni, Benedetta Carlotti, Fausto Elisei, Assunta Marrocchi, Anna Spalletti
Summary: This study presents strong experimental evidence for singlet fission in a new class of fluorene-based molecules, demonstrating ultrafast formation of a double triplet state and efficient triplet exciton separation. The role of solvent polarity and intramolecular charge transfer on the singlet fission mechanism was thoroughly investigated using advanced spectroscopies. These materials, with the unique property of generating high-energy triplet excitons through singlet fission, show promise as photosensitizers for photovoltaic devices.
Article
Biochemistry & Molecular Biology
Barbara Storti, Benedetta Carlotti, Grazia Chiellini, Martina Ruglioni, Tiziano Salvadori, Marco Scotto, Fausto Elisei, Alberto Diaspro, Paolo Bianchini, Ranieri Bizzarri
Summary: By combining steady-state and ultrafast spectroscopy with gated STED imaging, this study demonstrates that F99S/M153T/V163A GFP is an efficient genetic reporter for STED imaging, with no excited state absorption at depletion wavelengths <600 nm and a long emission lifetime. This makes c3GFP a valuable alternative to more common, but less photostable, EGFP and YFP/Citrine mutants for STED imaging studies targeting the green-yellow region of the optical spectrum.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Physical
Alessio Cesaretti, Tommaso Bianconi, Mariafrancesca Coccimiglio, Nicola Montegiove, Yogajivan Rout, Pier Luigi Gentili, Rajneesh Misra, Benedetta Carlotti
Summary: This study reports the evidence of emissive aggregates of push-pull phenothiazine and phenothiazine dioxide derivatives. These aggregates show promise for applications in biology and material science. The study investigates the aggregation-induced emission (AIE) mechanism through time-resolved spectroscopy and advanced data analysis. The results demonstrate significant AIE behavior activated by the restriction of intramolecular rotations. The aggregates also exhibit notable emission upon two-photon excitation and have potential as novel fluorophores for bioimaging.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Biochemistry & Molecular Biology
Alessio Cesaretti, Letizia Mencaroni, Carmela Bonaccorso, Valentina Botti, Eleonora Calzoni, Benedetta Carlotti, Cosimo Gianluca Fortuna, Nicolo Montegiove, Anna Spalletti, Fausto Elisei
Summary: This study investigated the binding ability of a highly water-soluble and red fluorescence dye with DNA and RNA, as well as the changes in their photophysical properties upon interaction with biological targets. The results revealed that certain fluorophores exhibited antiproliferative effects in the cell nucleus, while others were useful for specific organelle labeling in live cell imaging.
Article
Chemistry, Physical
Tommaso Bianconi, Alessio Cesaretti, Pietro Mancini, Nicolo Montegiove, Eleonora Calzoni, Anupama Ekbote, Rajneesh Misra, Benedetta Carlotti
Summary: In this study, we investigated the excited-state deactivation mechanism in three push-pull isomers with phenothiazine electron donor, benzothiazole electron acceptor, and phenyl pi-bridge at different positions. We observed spin-orbit charge-transfer-induced intersystem crossing and efficient production of singlet oxygen in these all-organic donor-acceptor compounds. Moreover, our findings showed the presence of room-temperature phosphorescence in host-guest matrices and water dispersions, and demonstrated the potential of these isomer aggregates for imaging-guided photodynamic therapy.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Biochemistry & Molecular Biology
Letizia Mencaroni, Alessio Cesaretti, Benedetta Carlotti, Martina Alebardi, Fausto Elisei, Ana Ratkovic, Irena Skoric, Anna Spalletti
Summary: The study investigates the optical properties of three aromatic ring derivatives and finds that they exhibit high fluorescence quantum yields and significant nonlinear optical properties, with the thiophene derivative showing the largest hyperpolarizability coefficient. The involvement of the triplet state plays a significant role in the molecular optical behavior, particularly in the thiophene derivative, which may have potential applications in photodynamic therapy.
Article
Biochemistry & Molecular Biology
Alessio Cesaretti, Eleonora Calzoni, Nicolo Montegiove, Tommaso Bianconi, Martina Alebardi, Maria Antonietta La Serra, Giuseppe Consiglio, Cosimo Gianluca Fortuna, Fausto Elisei, Anna Spalletti
Summary: Fluorescence imaging is seeking new far-red emitting probes that selectively respond to specific biological targets. Cationic push-pull dyes, with their intramolecular charge transfer (ICT) character and strong interaction with nucleic acids, show promise in meeting these requirements. In this study, two isomers of push-pull dimethylamino-phenyl dyes were examined for their ICT dynamics, DNA/RNA affinity, and in vitro behavior. The para-quinolinium derivative exhibited RNA-selectivity, localizing in nucleoli and mitochondria with fluorescence microscopy. It also showed potential as a theranostic agent with improved turn-on response and localized staining ability.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Manju Sheokand, Letizia Mencaroni, Anupama Ekbote, Tommaso Bianconi, Maria Aurora Mancuso, Fausto Elisei, Benedetta Carlotti, Rajneesh Misra
Summary: Pyridine-based derivatives Py-1, Py-2, and Py-3 were synthesized and their properties were investigated. Different substituents at the ortho position of the pyridine ring were studied. The derivatives showed high emissive properties and sensitivity to the environment and external stimuli. The introduction of heavy atoms in the pyridine acceptor enhanced the push-pull character and led to mechanochromic luminescence behavior.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Alessio Cesaretti, Zhengxu Cai, Junseok Kim, Hyungjun Kim, Yunxiang Lei, Benedetta Carlotti
Summary: A series of tetraphenyl pyrrole derivatives with benzonitrile substitution at different positions were synthesized and their structure-emission property relationships were investigated. The results showed enhanced intramolecular charge transfer and two-photon absorption cross sections when the substitution was at position 3 of the pyrrole. Substitution at position 2 activated dual-state emission behavior with high photoluminescence quantum yields. The findings provide new insights for the optimized design of highly emitting materials for efficient optoelectronic devices.
Article
Chemistry, Physical
Letizia Mencaroni, Martina Alebardi, Fausto Elisei, Irena Skoric, Anna Spalletti, Benedetta Carlotti
Summary: By employing advanced ultrafast spectroscopies, the excited-state evolution in a series of all-trans stilbenoid compounds was investigated, revealing the double nature of the 2Ag-like state with both singlet and triplet characteristics. The spectral difference between the 2Ag and triplet states was found to correlate with the observed triplet yield and the (1)(TT) separation rate constant. Singlet fission was found to occur efficiently in 1-(pyridyl-4-ylethenyl)-4-(p-nitrostyryl)benzene and nitro-styrylfuran due to their enhanced intramolecular charge transfer character.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Chiara Montanari, Tommaso Bianconi, Manju Sheokand, Titouan Teunens, Giulia Cavalletti, Jerome Cornil, Rajneesh Misra, Benedetta Carlotti
Summary: In this study, six new push-pull compounds with naphthalimide as the electron acceptor and phenothiazine or phenothiazine dioxide as the electron donor were synthesized. The structure-property relationships and the factors enabling thermally activated delayed fluorescence (TADF) in these compounds were investigated. The results showed that the phenothiazine derivatives had a larger push-pull degree compared to the phenothiazine dioxide derivatives, resulting in effective reverse intersystem crossing and TADF only in the case of the oxygen-free compounds. The increased conjugation in the octupolar systems and phenyl-bridged structures allowed higher fluorescence efficiencies to be achieved. The observation of intense red TADF in the solid state makes these materials highly promising for applications in third generation OLED devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Alessio Cesaretti, Anna Spalletti, Fausto Elisei, Paolo Foggi, Raimondo Germani, Cosimo G. Fortuna, Benedetta Carlotti
Summary: This study investigated the excited-state dynamics and nonlinear optical properties of two symmetrical quadrupolar cationic push-pull compounds with different lateral electron donors, as well as their dipolar counterparts. The research found that excited-state symmetry breaking in the quadrupolar compounds significantly affects their nonlinear optical properties and two-photon absorption ability.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(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)
