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Braun J, Powell AK, Unterreiner AN. Gaining Insights into the Interplay between Optical and Magnetic Properties in Photoexcited Coordination Compounds. Chemistry 2024:e202400977. [PMID: 38693865 DOI: 10.1002/chem.202400977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 04/19/2024] [Accepted: 04/30/2024] [Indexed: 05/03/2024]
Abstract
We describe early and recent advances in the fascinating field of combined magnetic and optical properties of inorganic coordination compounds and in particular of 3d-4f single molecule magnets. We cover various applied techniques which allow for the correlation of results obtained in the frequency and time domain in order to highlight the specific properties of these compounds and the future challenges towards multidimensional spectroscopic tools. An important point is to understand the details of the interplay of magnetic and optical properties through performing time-resolved studies in the presence of external fields especially magnetic ones. This will enable further exploration of this fundamental interactions i.e. the two components of electromagnetic radiation influencing optical properties.
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Affiliation(s)
- Jonas Braun
- Karlsruher Institut fur Technologie, Inorganic Chemistry, GERMANY
| | - Annie K Powell
- Karlsruher Institut fur Technologie, Inorganic Chemistry, GERMANY
| | - Andreas Neil Unterreiner
- Karlsruhe Institute of Technology Faculty of Chemistry and Biosciences: Karlsruher Institut fur Technologie Fakultat fur Chemie und Biowissenschaften, Abteilung für Molekulare Physikalische Chemie, Fritz-Haber-Weg 2 Geb. 30.44, 76131, Karlsruhe, GERMANY
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2
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Liu Y, Wu J, Cheng N, Gan P, Li Y, Liu W, Ye J, Tong M, Liang J. The overlooked role of UV 185 induced high-energy excited states in the dephosphorization of organophosphorus pesticide by VUV/persulfate. Chemosphere 2023:138993. [PMID: 37244548 DOI: 10.1016/j.chemosphere.2023.138993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/24/2023] [Accepted: 05/18/2023] [Indexed: 05/29/2023]
Abstract
Vacuum ultraviolet (VUV) based advanced oxidation processes (AOPs) recently attracted widespread interests. However, the role of UV185 in VUV is only considered to be generating a series of active species, while the effect of photoexcitation has long been overlooked. In this work, the role of UV185 induced high-energy excited state for the dephosphorization of organophosphorus pesticides was studied using malathion as a model. Results showed malathion degradation was highly related to radical yield, while its dephosphorization was not. It was UV185 rather than UV254 or radical yield that was responsible for malathion dephosphorization by VUV/persulfate. DFT calculation results demonstrated that the polarity of P-S bond was further increased during UV185 excitation, favoring dephosphorization while UV254 did not. The conclusion was further supported by degradation path identification. Moreover, despite the fact that anions (Cl-, SO42- and NO3-) considerably affected radical yield, only Cl- and NO3- with high molar extinction coefficient at 185 nm significantly affected dephosphorization. This study shed light on the crucial role of excited states in VUV based AOPs and provided a new idea for the development of mineralization technology of organophosphorus pesticides.
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Affiliation(s)
- Yudan Liu
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Jingke Wu
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Nanchunxiao Cheng
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Pengfei Gan
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Yunyi Li
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Wen Liu
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China
| | - Jiangyu Ye
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Meiping Tong
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China
| | - Jialiang Liang
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China.
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López-Vinent N, Cruz-Alcalde A, Lai C, Giménez J, Esplugas S, Sans C. Role of sunlight and oxygen on the performance of photo-Fenton process at near neutral pH using organic fertilizers as iron chelates. Sci Total Environ 2022; 803:149873. [PMID: 34525738 DOI: 10.1016/j.scitotenv.2021.149873] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 08/16/2021] [Accepted: 08/20/2021] [Indexed: 06/13/2023]
Abstract
Nowadays, reaction mechanisms of photo-Fenton process with chelated iron are not yet clearly defined. In this study, five organic fertilizers were used as iron complexes to investigate the role of sunlight and oxygen in photo-Fenton at near neutral pH. UV absorbance and stability constant of each selected iron chelate is different, and this work demonstrates that these parameters affect the reaction mechanisms in SMX degradation. Irradiation experiments without H2O2 revealed that only EDDS-Fe and DTPA-Fe achieved SMX degradation, but different iron release. These results, together with soluble oxygen free experiments, allowed the proposal of complementary reaction mechanisms to those of the classical photo-Fenton. The proposed mechanisms start through the potential photoexcitation of the iron complex, followed by subsequent oxygen-mediated hydroxyl radical generation reactions that are different for EDDS-Fe and DTPA-Fe. Moreover, irradiation experiments using EDTA-Fe and HEDTA-Fe had negligible SMX degradation despite iron release was observed, evidencing the differences between iron chelates.
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Affiliation(s)
- Núria López-Vinent
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, University of Barcelona, C/Martí i Franqués 1, 08028 Barcelona, Spain.
| | - Alberto Cruz-Alcalde
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, University of Barcelona, C/Martí i Franqués 1, 08028 Barcelona, Spain; Institute of Environmental Assessment and Water Research - Spanish National Research Council (IDAEA-CSIC), C/Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Claudia Lai
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, University of Barcelona, C/Martí i Franqués 1, 08028 Barcelona, Spain
| | - Jaime Giménez
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, University of Barcelona, C/Martí i Franqués 1, 08028 Barcelona, Spain
| | - Santiago Esplugas
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, University of Barcelona, C/Martí i Franqués 1, 08028 Barcelona, Spain
| | - Carme Sans
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, University of Barcelona, C/Martí i Franqués 1, 08028 Barcelona, Spain
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Grünbein ML, Kovacs GN, Kloos M, Gorel A, Doak RB, Shoeman RL, Barends TRM, Schlichting I. Crystallographic Studies of Rhodopsins: Structure and Dynamics. Methods Mol Biol 2022; 2501:147-168. [PMID: 35857227 DOI: 10.1007/978-1-0716-2329-9_7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Crystal structures have provided detailed insight in the architecture of rhodopsin photoreceptors. Of particular interest are the protein-chromophore interactions that govern the light-induced retinal isomerization and ultimately induce the large structural changes important for the various biological functions of the family. The reaction intermediates occurring along the rhodopsin photocycle have vastly differing lifetimes, from hundreds of femtoseconds to milliseconds. Detailed insight at high spatial and temporal resolution can be obtained by time-resolved crystallography using pump-probe approaches at X-ray free-electron lasers. Alternatively, cryotrapping approaches can be used. Both the approaches are described, including illumination and sample delivery. The importance of appropriate photoexcitation avoiding multiphoton absorption is stressed.
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Affiliation(s)
| | | | - Marco Kloos
- Max Planck Institute for Medical Research, Heidelberg, Germany
| | - Alexander Gorel
- Max Planck Institute for Medical Research, Heidelberg, Germany
| | - R Bruce Doak
- Max Planck Institute for Medical Research, Heidelberg, Germany
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Yi C, Yu Z, Ren Q, Liu X, Wang Y, Sun X, Yin S, Pan J, Huang X. Nanoscale ZnO-based photosensitizers for photodynamic therapy. Photodiagnosis Photodyn Ther 2020; 30:101694. [PMID: 32109615 DOI: 10.1016/j.pdpdt.2020.101694] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 02/08/2020] [Accepted: 02/21/2020] [Indexed: 02/07/2023]
Abstract
Due to the ability to induce the generation of reactive oxygen species (ROS) under light irradiation, ZnO nanoparticles show great potential in photodynamic therapy (PDT). Photo-triggered ROS production by ZnO nanoparticles and the resulting phototoxicity are efficient in killing cancer cells. This review highlights the recent exciting progress on the nanoscale ZnO-based photosensitizers (PSs) for PDT. Both the semplice ZnO nanoparticles as the PSs and the various chemicals (organic PS, dopant, metal and chemotherapeutic drugs) modified ZnO nanoparticles as the PSs show good ROS generation efficiency. The productive rate of ROS, the wavelength of exciting lights, and the therapeutic effect can be altered by doping different chemicals into ZnO nanoparticles at will. Additionally, we give some outlook on the design and functionalization of next-generation ZnO nanoparticles for more effective anti-cancer applications.
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Franskevych D, Prylutska S, Grynyuk I, Pasichnyk G, Drobot L, Matyshevska O, Ritter U. Mode of photoexcited C 60 fullerene involvement in potentiating cisplatin toxicity against drug-resistant L1210 cells. ACTA ACUST UNITED AC 2019; 9:211-217. [PMID: 31799157 PMCID: PMC6879712 DOI: 10.15171/bi.2019.26] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 03/08/2019] [Accepted: 04/09/2019] [Indexed: 11/23/2022]
Abstract
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Introduction: C60 fullerene has received great attention as a candidate for biomedical applications. Due to unique structure and properties, C60 fullerene nanoparticles are supposed to be useful in drug delivery, photodynamic therapy (PDT) of cancer, and reversion of tumor cells’ multidrug resistance. The aim of this study was to elucidate the possible molecular mechanisms involved in photoexcited C60 fullerene-dependent enhancement of cisplatin toxicity against leukemic cells resistant to cisplatin.
Methods: Stable homogeneous pristine C60 fullerene aqueous colloid solution (10-4 М, purity 99.5%) was used in the study. The photoactivation of C60 fullerene accumulated by L1210R cells was done by irradiation in microplates with light-emitting diode lamp (420-700 nm light, 100 mW·cm-2). Cells were further incubated with the addition of Cis-Pt to a final concentration of 1 μg/mL. Activation of p38 MAPK was visualized by Western blot analysis. Flow cytometry was used for the estimation of cells distribution on cell cycle. Mitochondrial membrane potential (Δψm) was estimated with the use of fluorescent potential-sensitive probe TMRE (Tetramethylrhodamine Ethyl Ester).
Results: Cis-Pt applied alone at 1 μg/mL concentration failed to affect mitochondrial membrane potential in L1210R cells or cell cycle distribution as compared with untreated cells. Activation of ROS-sensitive proapoptotic p38 kinase and enhanced content of cells in subG1 phase were detected after irradiation of L1210R cells treated with 10-5M C60 fullerene. Combined treatment with photoexcited C60 fullerene and Cis-Pt was followed by the dissipation of Δψm at early-term period, blockage of cell transition into S phase, and considerable accumulation of cells in proapoptotic subG1 phase at prolonged incubation.
Conclusion: The effect of the synergic cytotoxic activity of both agents allowed to suppose that photoexcited C60 fullerene promoted Cis-Pt accumulation in leukemic cells resistant to Cis-Pt. The data obtained could be useful for the development of new approaches to overcome drug-resistance of leukemic cells.
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Affiliation(s)
- Daria Franskevych
- Taras Shevchenko National University of Kyiv, Volodymyrska Str., 64, 01601 Kyiv, Ukraine
| | - Svitlana Prylutska
- Taras Shevchenko National University of Kyiv, Volodymyrska Str., 64, 01601 Kyiv, Ukraine
| | - Iryna Grynyuk
- Taras Shevchenko National University of Kyiv, Volodymyrska Str., 64, 01601 Kyiv, Ukraine
| | - Ganna Pasichnyk
- Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, Leontovicha Str, 9, Kyiv 01030, Ukraine
| | - Liudmyla Drobot
- Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, Leontovicha Str, 9, Kyiv 01030, Ukraine
| | - Olga Matyshevska
- Taras Shevchenko National University of Kyiv, Volodymyrska Str., 64, 01601 Kyiv, Ukraine.,Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, Leontovicha Str, 9, Kyiv 01030, Ukraine
| | - Uwe Ritter
- Technical University Ilmenau, Institute of Chemistry and Biotechnology, Weimarer Str., 25, 98693 Ilmenau, Germany
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Gasparyan F, Zadorozhnyi I, Khondkaryan H, Arakelyan A, Vitusevich S. Photoconductivity, pH Sensitivity, Noise, and Channel Length Effects in Si Nanowire FET Sensors. Nanoscale Res Lett 2018; 13:87. [PMID: 29589128 PMCID: PMC5871613 DOI: 10.1186/s11671-018-2494-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 03/09/2018] [Indexed: 06/08/2023]
Abstract
Silicon nanowire (NW) field-effect transistor (FET) sensors of various lengths were fabricated. Transport properties of Si NW FET sensors were investigated involving noise spectroscopy and current-voltage (I-V) characterization. The static I-V dependencies demonstrate the high quality of fabricated silicon FETs without leakage current. Transport and noise properties of NW FET structures were investigated under different light illumination conditions, as well as in sensor configuration in an aqueous solution with different pH values. Furthermore, we studied channel length effects on the photoconductivity, noise, and pH sensitivity. The magnitude of the channel current is approximately inversely proportional to the length of the current channel, and the pH sensitivity increases with the increase of channel length approaching the Nernst limit value of 59.5 mV/pH. We demonstrate that dominant 1/f-noise can be screened by the generation-recombination plateau at certain pH of the solution or external optical excitation. The characteristic frequency of the generation-recombination noise component decreases with increasing of illumination power. Moreover, it is shown that the measured value of the slope of 1/f-noise spectral density dependence on the current channel length is 2.7 which is close to the theoretically predicted value of 3.
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Affiliation(s)
- Ferdinand Gasparyan
- Bioelectronics (ICS-8), Forschungszentrum Jülich, 52425 Jülich, Germany
- Yerevan State University, 1 Alex Manoogian St., 0025 Yerevan, Armenia
| | - Ihor Zadorozhnyi
- Bioelectronics (ICS-8), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Hrant Khondkaryan
- Yerevan State University, 1 Alex Manoogian St., 0025 Yerevan, Armenia
| | - Armen Arakelyan
- Yerevan State University, 1 Alex Manoogian St., 0025 Yerevan, Armenia
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Gao Y, Li Y, Yao L, Li S, Liu J, Zhang H. Catalyst-free activation of peroxides under visible LED light irradiation through photoexcitation pathway. J Hazard Mater 2017; 329:272-279. [PMID: 28183016 DOI: 10.1016/j.jhazmat.2017.01.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2016] [Revised: 01/22/2017] [Accepted: 01/24/2017] [Indexed: 06/06/2023]
Abstract
Catalysts are known to activate peroxides to generate active radicals (i.e., hydroxyl radical (OH) and sulfate radical (SO4-)) under certain conditions, but the activation of peroxides in the absence of catalysts under visible light irradiation has been rarely reported. This work demonstrates a catalyst-free activation of peroxides for the generation of OH and/or SO4- through photoexcited electron transfer from organic dyes to peroxides under visible LED light irradiation, where Rhodamine B (RhB) and Eosin Y (EY) were selected as model dyes. The formation of OH and/or SO4- in the reactions and the electron transfer from the excited dyes to peroxides were validated via electron paramagnetic resonance (EPR), photoluminescence (PL) spectra and cyclic voltammetry (CV). The performance of the peroxide/dye/Vis process was demonstrated to be altered depending on the target substrate. Meanwhile, the peroxide/dye/Vis process was effective for simultaneous decolorization of dyes and production of active radicals under neutral even or basic conditions. The findings of this study clarified a novel photoexcitation pathway for catalyst-free activation of peroxides under visible light irradiation, which could avoid the secondary metal ion (dissolved or leached) pollution from the metal-based catalysts and expand the application range of the peroxide-based catalytic process.
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Affiliation(s)
- Yaowen Gao
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China; Shenzhen Research Institute of Wuhan University, Shenzhen, 518057, China
| | - Yixi Li
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China
| | - Linyu Yao
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China
| | - Simiao Li
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China
| | - Jin Liu
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China
| | - Hui Zhang
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China; Shenzhen Research Institute of Wuhan University, Shenzhen, 518057, China.
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Paunovic V, Ristic B, Markovic Z, Todorovic-Markovic B, Kosic M, Prekodravac J, Kravic-Stevovic T, Martinovic T, Micusik M, Spitalsky Z, Trajkovic V, Harhaji-Trajkovic L. c-Jun N-terminal kinase-dependent apoptotic photocytotoxicity of solvent exchange-prepared curcumin nanoparticles. Biomed Microdevices 2016; 18:37. [PMID: 27106025 DOI: 10.1007/s10544-016-0062-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Indian spice curcumin is known for its anticancer properties, but the anticancer mechanisms of nanoparticulate curcumin have not been completely elucidated. We here investigated the in vitro anticancer effect of blue light (470 nm, 1 W)-irradiated curcumin nanoparticles prepared by tetrahydrofuran/water solvent exchange, using U251 glioma, B16 melanoma, and H460 lung cancer cells as targets. The size of curcumin nanocrystals was approximately 250 nm, while photoexcitation induced their oxidation and partial agglomeration. Although cell membrane in the absence of light was almost impermeable to curcumin nanoparticles, photoexcitation stimulated their internalization. While irradiation with blue light (1-8 min) or nanocurcumin (1.25-10 μg/ml) alone was only marginally toxic to tumor cells, photoexcited nanocurcumin displayed a significant cytotoxicity depending both on the irradiation time and nanocurcumin concentration. Photoexcited nanocurcumin induced phosphorylation of c-Jun N-terminal kinase (JNK), mitochondrial depolarization, caspase-3 activation, and cleavage of poly (ADP-ribose) polymerase, indicating apoptotic cell death. Accordingly, pharmacologial inhibition of JNK and caspase activity rescued cancer cells from photoexcited nanocurcumin. On the other hand, antioxidant treatment did not reduce photocytotoxicity of nanocurcumin, arguing against the involvement of oxidative stress. By demonstrating the ability of photoexcited nanocurcumin to induce oxidative-stress independent, JNK- and caspase-dependent apoptosis, our results support its further investigation in cancer therapy.
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Affiliation(s)
- Verica Paunovic
- Institute of Microbiology and Immunology, School of Medicine, University of Belgrade, Dr Subotica 1, Belgrade, 11000, Serbia
| | - Biljana Ristic
- Institute of Microbiology and Immunology, School of Medicine, University of Belgrade, Dr Subotica 1, Belgrade, 11000, Serbia
| | - Zoran Markovic
- Polymer Institute, Slovak Academy of Sciences, Dubravska cesta 9, 84541, Bratislava, Slovakia
| | - Biljana Todorovic-Markovic
- Vinca Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, Mike Petrovica Alasa 12-14, Belgrade, 11001, Serbia
| | - Milica Kosic
- Institute of Microbiology and Immunology, School of Medicine, University of Belgrade, Dr Subotica 1, Belgrade, 11000, Serbia
| | - Jovana Prekodravac
- Vinca Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, Mike Petrovica Alasa 12-14, Belgrade, 11001, Serbia
| | - Tamara Kravic-Stevovic
- Institute of Histology and Embryology, School of Medicine, University of Belgrade, Visegradska 26, Belgrade, 11000, Serbia
| | - Tamara Martinovic
- Institute of Histology and Embryology, School of Medicine, University of Belgrade, Visegradska 26, Belgrade, 11000, Serbia
| | - Matej Micusik
- Polymer Institute, Slovak Academy of Sciences, Dubravska cesta 9, 84541, Bratislava, Slovakia
| | - Zdeno Spitalsky
- Polymer Institute, Slovak Academy of Sciences, Dubravska cesta 9, 84541, Bratislava, Slovakia
| | - Vladimir Trajkovic
- Institute of Microbiology and Immunology, School of Medicine, University of Belgrade, Dr Subotica 1, Belgrade, 11000, Serbia
| | - Ljubica Harhaji-Trajkovic
- Institute for Biological Research "Sinisa Stankovic", University of Belgrade, Despot Stefan Blvd. 142, Belgrade, 11000, Serbia.
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Tickner J. Photoexcitation of the high-spin J=8 isomer in (176)Yb using 8.5MeV end-point energy Bremsstrahlung. Appl Radiat Isot 2016; 110:42-46. [PMID: 26752318 DOI: 10.1016/j.apradiso.2015.12.054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 12/25/2015] [Indexed: 10/22/2022]
Abstract
Excitation of the 1049.8keV isomeric state (t1/2=11.4s, spin difference between ground and isomeric states ΔJ=8) in (176)Yb using Bremsstrahlung radiation is observed for the first time. In contrast to the photoexcitation of isomeric states in other nuclei with lower spin differences, where effective integrated cross-sections are of order tens to hundreds of barneV, an integrated cross-section of just 0.0484±0.066barneV is observed for (176)Yb.
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Affiliation(s)
- James Tickner
- Commonwealth Scientific and Industrial Research Organisation, Locked Bag 2005, Menai, NSW 2232, Australia.
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Wang D, Lü R, Yuan M, Fu A, Chu T. A DFT/TD-DFT study of thiazolidinedione derivative in dimethylformamide: cooperative roles of hydrogen bondings, electronic and vibrational spectra. Spectrochim Acta A Mol Biomol Spectrosc 2014; 125:131-137. [PMID: 24531543 DOI: 10.1016/j.saa.2014.01.094] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 12/05/2013] [Accepted: 01/19/2014] [Indexed: 06/03/2023]
Abstract
The time-dependent density functional theory (TDDFT) method has been applied to investigate the thiazolidinedione (TZD) derivative A and its hydrogen-bonded complexes with dimethylformamide (DMF) (A-DMF and A-2DMF). The calculation results showed that the excited-state hydrogen bondings of O-H⋯O=C and N-H⋯O=C are strengthened and weakened in the hydrogen-bonded trimer A-2DMF, and their cooperation effect caused a blue shift in the electronic spectrum of A-2DMF. This modulation mechanism of the hydrogen-bond strengthening and weakening and its role in influencing the spectroscopy property of the TZD derivative A in DMF have been analyzed and showed in details.
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Affiliation(s)
- Dandan Wang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China
| | - Rui Lü
- Laboratory of Pathogenic Biology, Medical College, Qingdao University, Qingdao 266071, People's Republic of China
| | - Minghu Yuan
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China
| | - Aiping Fu
- Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, People's Republic of China
| | - Tianshu Chu
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China; Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, People's Republic of China.
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