1
|
Tian R, Li K, Lin Y, Lu C, Duan X. Characterization Techniques of Polymer Aging: From Beginning to End. Chem Rev 2023; 123:3007-3088. [PMID: 36802560 DOI: 10.1021/acs.chemrev.2c00750] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Polymers have been widely applied in various fields in the daily routines and the manufacturing. Despite the awareness of the aggressive and inevitable aging for the polymers, it still remains a challenge to choose an appropriate characterization strategy for evaluating the aging behaviors. The difficulties lie in the fact that the polymer features from the different aging stages require different characterization methods. In this review, we present an overview of the characterization strategies preferable for the initial, accelerated, and late stages during polymer aging. The optimum strategies have been discussed to characterize the generation of radicals, variation of functional groups, substantial chain scission, formation of low-molecular products, and deterioration in the polymers' macro-performances. In view of the advantages and the limitations of these characterization techniques, their utilization in a strategic approach is considered. In addition, we highlight the structure-property relationship for the aged polymers and provide available guidance for lifetime prediction. This review could allow the readers to be knowledgeable of the features for the polymers in the different aging stages and provide access to choose the optimum characterization techniques. We believe that this review will attract the communities dedicated to materials science and chemistry.
Collapse
Affiliation(s)
- Rui Tian
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Kaitao Li
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Yanjun Lin
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- School of Chemical Engineering, Qinghai University, Xining 810016, China
| | - Chao Lu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Xue Duan
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| |
Collapse
|
2
|
Rozelle AL, Kumar RN, Lee S. Photo-induced DNA interstrand cross-links formed by a coumarin-modified nucleoside. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2019; 38:236-247. [PMID: 30922158 DOI: 10.1080/15257770.2018.1515439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Coumarins are a class of naturally occurring compounds that have been shown to form photochemical DNA interstrand cross-links (ICLs). However, study of a coumarin base has not been explored. Using nucleophilic substitution and phosphoramidite chemistry, we synthesized a coumarin base-containing oligonucleotide. Upon exposure to long-wave ultraviolet light, the coumarin-modified oligonucleotide formed ICLs with complementary oligonucleotide containing dT and dC opposite the coumarin base, presumably through a [2 + 2] cycloaddition mechanism. Moderate yields with both bases were observed; though, dT has a higher reactivity than dC. Overall, this work provides new means for biochemical characterization of ICLs formed by coumarins.
Collapse
Affiliation(s)
- Aaron Leland Rozelle
- a Division of Chemical Biology and Medicinal Chemistry , College of Pharmacy, The University of Texas at Austin , Austin , Texas , 78712 , USA
| | - Rayala Naveen Kumar
- a Division of Chemical Biology and Medicinal Chemistry , College of Pharmacy, The University of Texas at Austin , Austin , Texas , 78712 , USA
| | - Seongmin Lee
- a Division of Chemical Biology and Medicinal Chemistry , College of Pharmacy, The University of Texas at Austin , Austin , Texas , 78712 , USA
| |
Collapse
|
3
|
Greene LE, Lincoln R, Cosa G. Spatio-temporal monitoring of lipid peroxyl radicals in live cell studies combining fluorogenic antioxidants and fluorescence microscopy methods. Free Radic Biol Med 2018; 128:124-136. [PMID: 29649566 DOI: 10.1016/j.freeradbiomed.2018.04.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/05/2018] [Accepted: 04/06/2018] [Indexed: 12/28/2022]
Abstract
Lipid peroxidation of polyunsaturated fatty acids in cells may occur via their catalytic autoxidation through peroxyl radicals under oxidative stress conditions. Lipid peroxidation is related to a number of pathologies, and may be invoked in new forms of regulated cell death, yet it may also have beneficial roles in cell signaling cascades. Antioxidants are a natural line of defense against lipid peroxidation, and may accordingly impact the biological outcome associated with the redox chemistry of lipid peroxidation. Critical to unraveling the physiological and pathological role of lipid peroxidation is the development of novel probes with the partition, chemical sensitivity and more importantly, molecular specificity, enabling the spatial and temporal imaging of peroxyl radicals in the lipid membranes of live cells, reporting on the redox status of the cell membrane. This review describes our recent progress to visualize lipid peroxidation in model membrane systems and in live cell studies. Our work portrays the mechanistic insight leading to the development of a highly sensitive probe to monitor lipid peroxyl radicals (LOO•). It also describes technical aspects including reagents and fluorescence microscopy methodologies to consider in order to achieve the much sought after monitoring of rates of lipid peroxyl radical production in live cell studies, be it under oxidative stress but also under cell homeostasis. This review seeks to bring attention to the study of lipid redox reactions and to lay the groundwork for the adoption of fluorogenic antioxidant probeshancement and maximum intensity recorded in turn provide a benchmark to estimate, when compared to the control BODIPY dye lacking the intramolecular PeT based switch, the overall exte and related fluorescence microscopy methods toward gaining rich spatiotemporal information on lipid peroxidation in live cells.
Collapse
Affiliation(s)
- Lana E Greene
- Department of Chemistry and Quebec Center for Advanced Materials (QCAM/CQMF), McGill University, 801 Sherbrooke Street West, Montreal, QC, Canada H3A 0B8
| | - Richard Lincoln
- Department of Chemistry and Quebec Center for Advanced Materials (QCAM/CQMF), McGill University, 801 Sherbrooke Street West, Montreal, QC, Canada H3A 0B8
| | - Gonzalo Cosa
- Department of Chemistry and Quebec Center for Advanced Materials (QCAM/CQMF), McGill University, 801 Sherbrooke Street West, Montreal, QC, Canada H3A 0B8.
| |
Collapse
|
4
|
A facile route to heterotelechelic polymer prodrug nanoparticles for imaging, drug delivery and combination therapy. J Control Release 2018; 286:425-438. [DOI: 10.1016/j.jconrel.2018.08.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 07/30/2018] [Accepted: 08/07/2018] [Indexed: 12/31/2022]
|
5
|
Kreutzer J, Yagci Y. Metal Free Reversible-Deactivation Radical Polymerizations: Advances, Challenges, and Opportunities. Polymers (Basel) 2017; 10:E35. [PMID: 30966069 PMCID: PMC6415071 DOI: 10.3390/polym10010035] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 12/06/2017] [Accepted: 12/07/2017] [Indexed: 12/21/2022] Open
Abstract
A considerable amount of the worldwide industrial production of synthetic polymers is currently based on radical polymerization methods. The steadily increasing demand on high performance plastics and tailored polymers which serve specialized applications is driven by the development of new techniques to enable control of polymerization reactions on a molecular level. Contrary to conventional radical polymerization, reversible-deactivation radical polymerization (RDRP) techniques provide the possibility to prepare polymers with well-defined structures and functionalities. The review provides a comprehensive summary over the development of the three most important RDRP methods, which are nitroxide mediated radical polymerization, atom transfer radical polymerization and reversible addition fragmentation chain transfer polymerization. The focus thereby is set on the newest developments in transition metal free systems, which allow using these techniques for biological or biomedical applications. After each section selected examples from materials synthesis and application to biomedical materials are summarized.
Collapse
Affiliation(s)
- Johannes Kreutzer
- Department of Chemistry, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey.
| | - Yusuf Yagci
- Department of Chemistry, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey.
- Center of Excellence for Advanced Materials Research (CEAMR) and Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
| |
Collapse
|
6
|
Aparici-Espert I, Francés-Monerris A, Rodríguez-Muñiz GM, Roca-Sanjuán D, Lhiaubet-Vallet V, Miranda MA. A Combined Experimental and Theoretical Approach to the Photogeneration of 5,6-Dihydropyrimidin-5-yl Radicals in Nonaqueous Media. J Org Chem 2016; 81:4031-8. [DOI: 10.1021/acs.joc.6b00314] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Isabel Aparici-Espert
- Instituto
Universitario Mixto de Tecnología Química UPV-CSIC, Universitat Politècnica de València, Avda de los Naranjos s/n, 46022 València, Spain
| | | | - Gemma M. Rodríguez-Muñiz
- Instituto
Universitario Mixto de Tecnología Química UPV-CSIC, Universitat Politècnica de València, Avda de los Naranjos s/n, 46022 València, Spain
| | - Daniel Roca-Sanjuán
- Instituto
de Ciencia Molecular, Universitat de València, P.O. Box 22085, 46071 València, Spain
| | - Virginie Lhiaubet-Vallet
- Instituto
Universitario Mixto de Tecnología Química UPV-CSIC, Universitat Politècnica de València, Avda de los Naranjos s/n, 46022 València, Spain
| | - Miguel A. Miranda
- Instituto
Universitario Mixto de Tecnología Química UPV-CSIC, Universitat Politècnica de València, Avda de los Naranjos s/n, 46022 València, Spain
| |
Collapse
|
7
|
Lederhose P, Haworth NL, Thomas K, Bottle SE, Coote ML, Barner-Kowollik C, Blinco JP. Design of Redox/Radical Sensing Molecules via Nitrile Imine-Mediated Tetrazole-ene Cycloaddition (NITEC). J Org Chem 2015; 80:8009-17. [DOI: 10.1021/acs.joc.5b01088] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Paul Lederhose
- School
of Chemistry, Physics and Mechanical Engineering, Faculty of Science
and Technology, Queensland University of Technology, Queensland 4001, Australia
- Preparative
Macromolecular Chemistry, Institut für Technische Chemie und
Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstr. 18, 76131 Karlsruhe, Germany
- Institut
für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Naomi L. Haworth
- ARC
Centre of Excellence for Electromaterials Science, Research School
of Chemistry, The Australian National University, Canberra, ACT 2601, Australia
| | - Komba Thomas
- School
of Chemistry, Physics and Mechanical Engineering, Faculty of Science
and Technology, Queensland University of Technology, Queensland 4001, Australia
| | - Steven E. Bottle
- School
of Chemistry, Physics and Mechanical Engineering, Faculty of Science
and Technology, Queensland University of Technology, Queensland 4001, Australia
| | - Michelle L. Coote
- ARC
Centre of Excellence for Electromaterials Science, Research School
of Chemistry, The Australian National University, Canberra, ACT 2601, Australia
| | - Christopher Barner-Kowollik
- School
of Chemistry, Physics and Mechanical Engineering, Faculty of Science
and Technology, Queensland University of Technology, Queensland 4001, Australia
- Preparative
Macromolecular Chemistry, Institut für Technische Chemie und
Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstr. 18, 76131 Karlsruhe, Germany
- Institut
für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - James P. Blinco
- School
of Chemistry, Physics and Mechanical Engineering, Faculty of Science
and Technology, Queensland University of Technology, Queensland 4001, Australia
| |
Collapse
|
8
|
Chmela Š, Kollár J, Hrčková Ľ. Fluorescent dye-labeled TIPNO type regulator for nitroxide mediated reversible-deactivation radical polymerization. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2015.04.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
9
|
H. Lessard B, P. Bender T. Controlled and selective placement of boron subphthalocyanines on either chain end of polymers synthesized by nitroxide mediated polymerization. AIMS MOLECULAR SCIENCE 2015. [DOI: 10.3934/molsci.2015.4.411] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|
10
|
Impellizzeri S, Stamplecoskie KG, Scaiano JC. Sensitized excited free-radical processes as read–write tools: impact on non-linear lithographic processes. Phys Chem Chem Phys 2013; 15:14873-8. [DOI: 10.1039/c3cp51723c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
|
11
|
|
12
|
Yan GP, Fairfull-Smith KE, Smith CD, Hanson GR, Bottle SE. Porphyrin containing isoindoline nitroxides as potential fluorescence sensors of free radicals. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424611003203] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A series of new spin-labeled porphyrin containing isoindoline nitroxide moieties were synthesized and characterized as potential free radical fluorescence sensors. Fluorescence-suppression was observed in the free-base monoradical porphyrins, whilst the free-base biradical porphyrins exhibited highly suppressed fluorescence about three times greater than the monoradical porphyrins. The observed fluorescence-suppression was attributed to enhanced intersystem crossing resulting from electronexchange between the doublet nitroxide and the excited porphyrin fluorophore. Notably, fluorescencesuppression was not as strong in the related metalated porphyrins, possibly due to insufficient spin coupling between the nitroxide and the porphyrin. Continuous wave EPR spectroscopy of the diradical porphyrins in fluid solution suggests that the nitroxyl-nitroxyl interspin distance is long enough and tumbling is fast enough not to detect dipolar coupling.
Collapse
Affiliation(s)
- Guo-Ping Yan
- School of Material Science and Engineering, Wuhan Institute of Technology, Wuhan 430073, P.R. China
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Kathryn E. Fairfull-Smith
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Craig D. Smith
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Graeme R. Hanson
- Centre for Advanced Imaging, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Steven E. Bottle
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane, QLD 4001, Australia
| |
Collapse
|
13
|
Monti S, Cicogna F, Passaglia E, Prampolini G, Barone V. Theoretical study of the conformational and optical properties of a fluorescent dye. A step toward modeling sensors grafted on polymer structures. Phys Chem Chem Phys 2011; 13:21471-8. [PMID: 22052212 DOI: 10.1039/c1cp22878a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The conformational and photophysical properties in toluene solution of a naphthoic acid derivative, namely 4-naphthoyloxy-1-methoxy-2,2,6,6-tetramethylpiperidine, which can simulate a pendant active group grafted on apolar polymer structures, were studied by means of calculations based on the density functional theory (DFT) and its time-dependent extension (TD-DFT) coupled to a polarizable continuum model (PCM) of the surrounding medium. The conformational landscape was exhaustively explored and the conformers responsible for the absorption and emission spectra were identified through well established computational procedures based on a tuned combination of functional (PBE0) and basis set (N07D) which reproduced satisfactorily the experimental absorption and emission wavelengths.
Collapse
Affiliation(s)
- Susanna Monti
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR), UoS di Pisa Area della Ricerca, via G. Moruzzi 1, I-56124 Pisa, Italy.
| | | | | | | | | |
Collapse
|
14
|
Wagner H, Brinks MK, Hirtz M, Schäfer A, Chi L, Studer A. Chemical Surface Modification of Self-Assembled Monolayers by Radical Nitroxide Exchange Reactions. Chemistry 2011; 17:9107-12. [DOI: 10.1002/chem.201100543] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2011] [Revised: 04/04/2011] [Indexed: 11/09/2022]
|
15
|
Morris JC, McMurtrie JC, Bottle SE, Fairfull-Smith KE. Generation of Profluorescent Isoindoline Nitroxides Using Click Chemistry. J Org Chem 2011; 76:4964-72. [DOI: 10.1021/jo200613r] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jason C. Morris
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology and ‡Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Queensland 4001, Australia
| | - John C. McMurtrie
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology and ‡Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Queensland 4001, Australia
| | - Steven E. Bottle
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology and ‡Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Queensland 4001, Australia
| | - Kathryn E. Fairfull-Smith
- ARC Centre of Excellence for Free Radical Chemistry and Biotechnology and ‡Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Queensland 4001, Australia
| |
Collapse
|
16
|
Becker M, Cola LD, Studer A. Site-specific immobilization of proteins at zeolite L crystals by nitroxide exchange reactions. Chem Commun (Camb) 2011; 47:3392-4. [DOI: 10.1039/c0cc05474g] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
17
|
Colwell JM, Blinco JP, Hulbert C, Fairfull-Smith KE, Bottle SE. A Profluorescent Azaphenalene Nitroxide for Nitroxide-Mediated Polymerization. Aust J Chem 2011. [DOI: 10.1071/ch10404] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A novel nitroxide‐mediated polymerization (NMP) control agent; 1,1,3,3‐tetramethyl‐2,3‐dihydro‐2‐azaphenalen‐2‐yloxyl (TMAO), was used in the free‐radical polymerization of styrene. The conversion of styrene during NMP was studied using FT‐Raman spectroscopy and the effectiveness of TMAO as a NMP control agent was assessed by GPC analysis. Fidelity of the TMAO‐alkoxyamine end‐group on the synthesized polymers was confirmed by GPC, UV‐Vis and fluorescence spectroscopic analyses. Comparison to the well known NMP control agent, TEMPO was made. TMAO showed control of molecular weight approaching that of TEMPO. Attempts to improve the properties of TMAO as an NMP control agent by synthesizing an analogue with bulkier substituents around the nitroxide did not generate the target molecule but demonstrated some of the interesting chemistry of the azaphenalene ring system.
Collapse
|
18
|
Blinco JP, Fairfull-Smith KE, Morrow BJ, Bottle SE. Profluorescent Nitroxides as Sensitive Probes of Oxidative Change and Free Radical Reactions. Aust J Chem 2011. [DOI: 10.1071/ch10442] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This paper presents a review on the use of tethered nitroxide–fluorophore molecules as probes of oxidative change and free radical generation and reaction. The proximity of the nitroxide free radical to the fluorophore suppresses the normal fluorescence emission process. Nitroxide free radical scavenging, metabolism or redox chemistry return the system to its natural fluorescent state and so these tethered nitroxide–fluorophore molecules are described as being profluorescent. A survey of profluorescent nitroxides found in the literature is provided as well as background on the mechanism of action and applications of these compounds as fluorometric probes within the fields of biological, materials and environmental sciences.
Collapse
|
19
|
|
20
|
Schulte B, Tsotsalas M, Becker M, Studer A, De Cola L. Dynamische Selbstorganisation von Mikrokristallen über Nitroxidaustauschreaktionen. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201002851] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
21
|
Yoshikawa H, Kobayashi M, Takahashi T, Awaga K. A Novel Free Radical Probe Based on a Preluminescent Iridium Complex Bearing a Nitronyl Radical Moiety. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2010. [DOI: 10.1246/bcsj.20100050] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
22
|
Guillaneuf Y, Dufils PE, Autissier L, Rollet M, Gigmes D, Bertin D. Radical Chain End Chemical Transformation of SG1-Based Polystyrenes. Macromolecules 2009. [DOI: 10.1021/ma901838m] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Yohann Guillaneuf
- UMR 6264 Laboratoire Chimie Provence, Université de Provence, Avenue Escadrille Normandie-Niemen, Case 542, Marseille 13397, Cedex 20, France
| | - Pierre-Emmanuel Dufils
- UMR 6264 Laboratoire Chimie Provence, Université de Provence, Avenue Escadrille Normandie-Niemen, Case 542, Marseille 13397, Cedex 20, France
| | - Laurent Autissier
- UMR 6264 Laboratoire Chimie Provence, Université de Provence, Avenue Escadrille Normandie-Niemen, Case 542, Marseille 13397, Cedex 20, France
| | - Marion Rollet
- UMR 6264 Laboratoire Chimie Provence, Université de Provence, Avenue Escadrille Normandie-Niemen, Case 542, Marseille 13397, Cedex 20, France
| | - Didier Gigmes
- UMR 6264 Laboratoire Chimie Provence, Université de Provence, Avenue Escadrille Normandie-Niemen, Case 542, Marseille 13397, Cedex 20, France
| | - Denis Bertin
- UMR 6264 Laboratoire Chimie Provence, Université de Provence, Avenue Escadrille Normandie-Niemen, Case 542, Marseille 13397, Cedex 20, France
| |
Collapse
|
23
|
Jia M, Tang Y, Lam YF, Green SA, Blough NV. Prefluorescent Nitroxide Probe for the Highly Sensitive Determination of Peroxyl and Other Radical Oxidants. Anal Chem 2009; 81:8033-40. [DOI: 10.1021/ac901374m] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Min Jia
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Chemistry Department, Michigan Technological University, Houghton, Michigan 49931
| | - Yu Tang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Chemistry Department, Michigan Technological University, Houghton, Michigan 49931
| | - Yiu-Fai Lam
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Chemistry Department, Michigan Technological University, Houghton, Michigan 49931
| | - Sarah A. Green
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Chemistry Department, Michigan Technological University, Houghton, Michigan 49931
| | - Neil V. Blough
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Chemistry Department, Michigan Technological University, Houghton, Michigan 49931
| |
Collapse
|
24
|
Chmela Š, Hrčková L. Nitroxide mediated styrene radical polymerization using a fluorescence marked mediator. Eur Polym J 2009. [DOI: 10.1016/j.eurpolymj.2009.06.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
25
|
Dou W, Su X. Study on the interaction between nitroxide free radical and conjugated polyelectrolytes by fluorimetry. LUMINESCENCE 2009; 24:45-9. [DOI: 10.1002/bio.1062] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
26
|
Fairfull-Smith KE, Bottle SE. The Synthesis and Physical Properties of Novel Polyaromatic Profluorescent Isoindoline Nitroxide Probes. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800597] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
27
|
Sato S, Suzuki M, Soma T, Tsunoda M. Synthesis and properties of umbelliferone-nitroxide radical hybrid compounds as fluorescence and spin-label probes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 70:799-804. [PMID: 18029225 DOI: 10.1016/j.saa.2007.09.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2007] [Revised: 08/30/2007] [Accepted: 09/18/2007] [Indexed: 05/25/2023]
Abstract
Two hybrid compounds 6 and 7, linked via an ester-bond between the 7-hydroxyl residue of an umbelliferone 1 and a carboxylic acid residue of two nitroxide radicals 3 and 4, and one hybrid compound 8, linked via an ester-bond between a 3-carboxylic acid residue of umbelliferone 2 and a hydroxyl residue of nitroxide radical 5, were synthesized in good yields, and their fluorescence and ESR spectra before and after the addition of L-ascorbic acid sodium salt in PBS (pH 7.0) were measured. The ESR intensities of 6 and 7 were proportionally reduced after the addition of ascorbic acid sodium salt, and their fluorescence intensities were increased maximally by eight- and nine-fold, respectively. However, the fluorescence intensity of 8 was essentially unchanged.
Collapse
Affiliation(s)
- Shingo Sato
- Department of Chemistry and Chemical Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa-shi, Yamagata 992-8510, Japan.
| | | | | | | |
Collapse
|
28
|
Fairfull-Smith KE, Blinco JP, Keddie DJ, George GA, Bottle SE. A Novel Profluorescent Dinitroxide for Imaging Polypropylene Degradation. Macromolecules 2008. [DOI: 10.1021/ma701944p] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kathryn E. Fairfull-Smith
- Australian Research Council Centre of Excellence for Free Radical Chemistry and Biotechnology, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia
| | - James P. Blinco
- Australian Research Council Centre of Excellence for Free Radical Chemistry and Biotechnology, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia
| | - Daniel J. Keddie
- Australian Research Council Centre of Excellence for Free Radical Chemistry and Biotechnology, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia
| | - Graeme A. George
- Australian Research Council Centre of Excellence for Free Radical Chemistry and Biotechnology, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia
| | - Steven E. Bottle
- Australian Research Council Centre of Excellence for Free Radical Chemistry and Biotechnology, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia
| |
Collapse
|
29
|
Feng P, Zhu J, Cheng Z, Zhang Z, Zhu X. Reversible addition–fragmentation chain transfer polymerization of 7-(4-(acryloyloxy)butoxy)coumarin. POLYMER 2007. [DOI: 10.1016/j.polymer.2007.08.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
30
|
Kawai A, Shibuya K. Charge-Transfer Controlled Exchange Interaction in Radical-Triplet Encounter Pairs as Studied by FT-EPR Spectroscopy. J Phys Chem A 2007; 111:4890-901. [PMID: 17518447 DOI: 10.1021/jp067753d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The exchange interaction, J, producing quartet and doublet energy separation in radical-triplet excited molecule encounter pairs, was investigated in solution by measuring chemically induced dynamic electron polarization (CIDEP) created through the radical-triplet pair mechanism. A time-resolved FT-EPR method was utilized to measure CIDEP of galvinoxyl radical by recording FID signals and an absolute magnitude of CIDEP, P(n), was determined for each radical-triplet system by detailed analysis of the time evolution curves of CIDEP. A transient FT-EPR signal phase remarkably depends on the triplet molecule. The signal phase is related to the sign of J value, which is responsible for the radical-triplet pair interaction. Most of galvinoxyl-triplet systems showed normal negative sign. An unusual positive sign was found in some systems characterized by a small energy gap, DeltaG, between the radical-triplet pair and intermolecular charge transfer (CT) states. A theoretical calculation of J value for radical-triplet encounter pairs was carried out by considering exchange integral and intermolecular CT interaction. According to the calculated J value and the diffusion theory for CIDEP magnitude, experimental Pn values were theoretically reproduced as a function of DeltaG. The present results confirm our previously reported CT model explaining the complicated nature of the sign of J value in the galvinoxyl-triplet encounter pairs. According to the proposed model for CT effect on J value and CIDEP results, nature of J value in radical-triplet pairs is discussed.
Collapse
Affiliation(s)
- Akio Kawai
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ohokayama, Tokyo 152-8551, Japan.
| | | |
Collapse
|
31
|
Ivan MG, Scaiano JC. A New Approach for the Detection of Carbon-centered Radicals in Enzymatic Processes Using Prefluorescent Probes¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2003)0780416anaftd2.0.co2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
32
|
Maretti L, Ferbinteanu M, Cimpoesu F, Islam SSM, Ohba Y, Kajiwara T, Yamashita M, Yamauchi S. Spin coupling in the supramolecular structure of a new tetra(quinoline-TEMPO)yttrium(III) complex. Inorg Chem 2007; 46:660-9. [PMID: 17257008 DOI: 10.1021/ic0610841] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The newly synthesized tetra(quinoline-TEMPO)yttrium(III) potassium salt shows interesting structural features at the molecular and supramolecular levels, revealed by the analysis of the X-ray diffraction data. The magnetic susceptibility and EPR data corroborated with structural considerations showed that the exchange and dipolar spin coupling interactions are taking place at the nodes assembling the supramolecular 2D structure. The Y(III) center shows antiprismatic octacoordination, close to the idealized D2 symmetry. The diamagnetic transition metal plays no role in mediating the radical interactions since the TEMPO-type fragments are remote from the chelating moieties of the ligand. In turn, significant interaction occurs on the nodes consisting in the quasi-rectangular coordination of potassium counterions by the spin-bearing TEMPO groups coming from four distinct complex units. The antiferromagnetic susceptibility was consistently modeled by a spin Hamiltonian based on the rectangle topology of four spins S = 1/2. The fitted exchange parameters are Ja = -5.1 cm-1 and Jb = -3.4 cm-1 for the edges, imposing Jd = 0 for the diagonal. These values are in excellent agreement with the ab initio results Ja = -4.83 cm-1, Jb = -3.44 cm-1, Jd = -0.07 cm-1 obtained in a CASSCF(12,8) calculation. Based on the reliability of the ab initio results we were able to select the presented J parameters among several versions of multiple solutions with acceptable goodness of the fit. A methodological caveat about the artifacts of the automatic use of best fit parameters, in the absence of supplementary criteria, in the context of relative blindness of magnetic susceptibility modeling, is raised. The details of the EPR spectrum at 10 K are also consistent, in the frame of dipolar approximation, with the model of four interacting spins at the nodes of the supramolecular assembling.
Collapse
Affiliation(s)
- Luca Maretti
- Institute for Chemical Reaction Science, Tohoku University, Aoba-ku, Katahira 2-1-1, Sendai 980-8577, Japan
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Goto A, Scaiano JC, Maretti L. Photolysis of an alkoxyamine using intramolecular energy transfer from a quinoline antenna—towards photo-induced living radical polymerization. Photochem Photobiol Sci 2007; 6:833-5. [PMID: 17668111 DOI: 10.1039/b705671k] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photolysis of an alkoxyamine triad comprised of the 1-phenylethyl moiety, 2,2,6,6-tetramethylpiperidinyl-1-oxy (TEMPO) and 2-methyl-3-hydroxy quinoline leads to energy transfer from the quinoline moiety (antenna) and cleavage of the C-O alkoxyamine bond, suggesting its possible applications in low temperature living free radical polymerization.
Collapse
Affiliation(s)
- Atsushi Goto
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | | | | |
Collapse
|
34
|
Li L, Hamer GK, Georges MK. A Quantitative 1H NMR Method for the Determination of Alkoxyamine Dissociation Rate Constants in Stable Free Radical Polymerization. Application to Styrene Dimer Alkoxyamines. Macromolecules 2006. [DOI: 10.1021/ma061700c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lichun Li
- Department of Chemical and Physical Sciences, University of Toronto at Mississauga, 3359 Mississauga Road, Mississauga, Ontario, Canada L5L 1C6
| | - Gordon K. Hamer
- Department of Chemical and Physical Sciences, University of Toronto at Mississauga, 3359 Mississauga Road, Mississauga, Ontario, Canada L5L 1C6
| | - Michael K. Georges
- Department of Chemical and Physical Sciences, University of Toronto at Mississauga, 3359 Mississauga Road, Mississauga, Ontario, Canada L5L 1C6
| |
Collapse
|
35
|
Focsaneanu KS, Scaiano J. The Persistent Radical Effect: From Mechanistic Curiosity to Synthetic Tool. Helv Chim Acta 2006. [DOI: 10.1002/hlca.200690227] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
36
|
Danko M, Chmela Š, Hrdlovič P. Synthesis, photochemical stability and photo-stabilizing efficiency of probes based on benzothioxanthene chromophore and Hindered Amine Stabilizer. Polym Degrad Stab 2006. [DOI: 10.1016/j.polymdegradstab.2005.07.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
37
|
Dang YM, Guo XQ. New approach for the detection of peptide- and protein-based radicals using a pre-fluorescent probe. APPLIED SPECTROSCOPY 2006; 60:203-7. [PMID: 16542572 DOI: 10.1366/000370206776023269] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
A novel application for pre-fluorescent probes in the detection of peptide- and protein-based radicals is proposed. Pre-fluorescent probes combine a fluorescent moiety labeled with a paramagnetic nitroxide that acts as a fluorescence quencher. Trapping of a radical by the nitroxide group restores the fluorescence properties. The increase in fluorescence intensity with time reflects the formation and quenching of free radicals and can be employed for the quantitative evaluation of yields and kinetics. In this test system, the pre-fluorescent probe 4-(9-acridinecarbonate)-2,2,6,6-tetramethylpiperidinyl-1-oxyl radical (Ac-Tempo), in which an acridine moiety was labeled with 2,2,6,6-tetramethylpiperidinyl-1-oxy (Tempo), was employed to probe peptide- and protein-based radicals. Peptide-based radicals were generated through the reaction between horseradish peroxidase (HRP)/H(2)O(2) and a derivative of tyrosine. Protein-based radicals were generated through the reaction between myoglobin (Mb) and H(2)O(2). In both cases the Ac-Tempo was found, using a combination of high-performance liquid chromatography (HPLC) and mass spectrometry, to be converted into fluorescent acridine (Ac)-piperidine (4-(9-acridinecarbonate)-2,2,6,6-tetramethylpiperidine).
Collapse
Affiliation(s)
- Ya-Min Dang
- The MOE Key Laboratory of Analytical Science and the Key laboratory for Chemical Biology of Fujian Province, Department of Chemistry, Xiamen University, China
| | | |
Collapse
|
38
|
Poly(amidoamine) Dendrimers Bearing Electron-Donating Chromophores: Fluorescence and Electrochemical Properties. Polym Bull (Berl) 2005. [DOI: 10.1007/s00289-005-0462-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
39
|
Micallef AS, Blinco JP, George GA, Reid DA, Rizzardo E, Thang SH, Bottle SE. The application of a novel profluorescent nitroxide to monitor thermo-oxidative degradation of polypropylene. Polym Degrad Stab 2005. [DOI: 10.1016/j.polymdegradstab.2005.01.030] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
40
|
Guillaneuf Y, Bertin D, Castignolles P, Charleux B. New Experimental Procedure To Determine the Recombination Rate Constants between Nitroxides and Macroradicals. Macromolecules 2005. [DOI: 10.1021/ma050241x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
41
|
Aspée A, Maretti L, Scaiano JC. Monitoring photodecomposition of dibenzyl ketone within NaY zeolite with a pre-fluorescent nitroxide compound. Photochem Photobiol Sci 2005; 2:1125-9. [PMID: 14690224 DOI: 10.1039/b308638k] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Benzyl radicals derived from photodecomposition of dibenzyl ketone have been monitored in NaY zeolite using the pre-fluorescent probe 4-(3-hydroxy-2-methyl-4-quinolinoyloxy)-2,2,6,6-tetramethylpiperidine-1-oxyl free radical (QT). The steady-state and time-resolved fluorescence show a strong interaction of QT within the zeolite cavities. Furthermore, the increase in the fluorescence with the irradiation time reveals the efficient trapping of benzyl radicals by QT under vacuum. Dispersion of the zeolite composites in liquid polymers results in an improvement in the fluorescence measurement and faster kinetics in comparison with the solid samples. These results are interpreted in terms of partial refractive index matching as a consequence of polymer reptation into the zeolite cavities. Analysis of the fluorescence lifetime distribution shows the presence of different fluorescence ensembles with different fluorescence quantum yields, depending on the microenvironment within the zeolite particle. Pre-fluorescent probes offer a novel and useful methodology for studying radical processes in zeolites.
Collapse
Affiliation(s)
- Alexis Aspée
- Department of Chemistry, University of Ottawa, 10 Mari-Curie, Ottawa, Ontario, Canada K1N 6N5
| | | | | |
Collapse
|
42
|
Trenor SR, Shultz AR, Love BJ, Long TE. Coumarins in Polymers: From Light Harvesting to Photo-Cross-Linkable Tissue Scaffolds. Chem Rev 2004; 104:3059-77. [PMID: 15186188 DOI: 10.1021/cr030037c] [Citation(s) in RCA: 551] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Scott R Trenor
- Polymeric Materials and Interfaces Laboratory, Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0344, USA
| | | | | | | |
Collapse
|
43
|
|
44
|
Mitsui M, Kobori Y, Kawai A, Obi K. Quenching Mechanism of Excited Coronene by a Nitroxide Radical Studied by Probing Dynamic Electron Polarization. J Phys Chem A 2004. [DOI: 10.1021/jp036685h] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masaaki Mitsui
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Yasuhiro Kobori
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Akio Kawai
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Kinichi Obi
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ohokayama, Meguro-ku, Tokyo 152-8551, Japan
| |
Collapse
|
45
|
Kruse TM, Souleimonova R, Cho A, Gray MK, Torkelson JM, Broadbelt LJ. Limitations in the Synthesis of High Molecular Weight Polymers via Nitroxide-Mediated Controlled Radical Polymerization: Modeling Studies. Macromolecules 2003. [DOI: 10.1021/ma030091v] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Todd M. Kruse
- Department of Chemical Engineering and Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
| | - Razima Souleimonova
- Department of Chemical Engineering and Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
| | - Andrew Cho
- Department of Chemical Engineering and Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
| | - Maisha K. Gray
- Department of Chemical Engineering and Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
| | - John M. Torkelson
- Department of Chemical Engineering and Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
| | - Linda J. Broadbelt
- Department of Chemical Engineering and Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
| |
Collapse
|
46
|
Miura Y, Ichikawa A, Taniguchi I. ‘Living’ radical polymerization of styrene mediated by spiro ring-substituted piperidinyl-N-oxyl radicals. The effect of the spiro rings on the control of polymerization. POLYMER 2003. [DOI: 10.1016/s0032-3861(03)00497-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
47
|
Miura Y, Nakamura N, Taniguchi I, Ichikawa A. Radical polymerization of butyl acrylate and random copolymerization of styrene and butyl acrylate and styrene and methyl methacrylate mediated by monospiro- and dispiropiperidinyl-N-oxyl radicals. POLYMER 2003. [DOI: 10.1016/s0032-3861(03)00275-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
48
|
Ricci A, Chrétien MN, Maretti L, Scaiano JC. TiO2-promoted mineralization of organic sunscreens in water suspension and sodium dodecyl sulfate micelles. Photochem Photobiol Sci 2003; 2:487-92. [PMID: 12803070 DOI: 10.1039/b212815b] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photostability of the widely used UVB sunscreen agents 2'-ethylhexyl-2-cyano-3-phenylcinnamate (1), 2-hydroxy-4-methoxybenzophenone (2), octyl salicilate (3), and 2'-ethylhexyl-4-methoxycinnamate (4) has been investigated under UVA irradiation in the absence and presence of TiO2, an inorganic filter commonly employed in combination with organic filters in sunscreen preparations. In the absence of TiO2, 1-3 are photostable and 4 undergoes the expected E-Z isomerization; the presence of TiO2 caused mineralization of the organic filters and, surprisingly, the process is noticeably faster in the presence of surfactant than in sunscreen and water suspensions. The results indicate that in water suspension, mineralization is likely to occur on or near the TiO2 particle surface; when the organic sunscreens are segregated in the micelle core, reactive radicals, produced during TiO2-promoted degradation of the micellar system, may participate in sunscreen degradation. In addition, a pre-fluorescent probe for carbon-centered radical detection, 4-(3-hydroxy-2-methyl-4-quinolineoxy)-2,2,6,6-tetramethylpiperidine-1-oxyl free radical or QT (5), was employed to demonstrate that carbon-centered radicals are evolved during micelle degradation and may participate in the mineralization of sunscreens.
Collapse
Affiliation(s)
- Andrea Ricci
- Department of Chemistry, Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Canada K1N 6N5
| | | | | | | |
Collapse
|
49
|
Aspée A, García O, Maretti L, Sastre R, Scaiano JC. Free Radical Reactions in Poly(methyl methacrylate) Films Monitored Using a Prefluorescent Quinoline−TEMPO Sensor. Macromolecules 2003. [DOI: 10.1021/ma0212994] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexis Aspée
- Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada, and Instituto de Ciencia y Tecnología de Polímeros (CSIC), Juan de la Cierva 3, Madrid 28006, Spain
| | - Olga García
- Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada, and Instituto de Ciencia y Tecnología de Polímeros (CSIC), Juan de la Cierva 3, Madrid 28006, Spain
| | - Luca Maretti
- Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada, and Instituto de Ciencia y Tecnología de Polímeros (CSIC), Juan de la Cierva 3, Madrid 28006, Spain
| | - Roberto Sastre
- Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada, and Instituto de Ciencia y Tecnología de Polímeros (CSIC), Juan de la Cierva 3, Madrid 28006, Spain
| | - J. C. Scaiano
- Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada, and Instituto de Ciencia y Tecnología de Polímeros (CSIC), Juan de la Cierva 3, Madrid 28006, Spain
| |
Collapse
|
50
|
Coenjarts C, García O, Llauger L, Palfreyman J, Vinette AL, Scaiano JC. Mapping photogenerated radicals in thin polymer films: fluorescence imaging using a prefluorescent radical probe. J Am Chem Soc 2003; 125:620-1. [PMID: 12526647 DOI: 10.1021/ja028835s] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Prefluorescent radical probes, in which fluorescence is activated by radical trapping, and photoinitiators were used to detect radical generation in polymer films using fluorescence spectroscopy and microscopy. Prefluorescent radical probes are the foundation of a fluorescence imaging system for polymer films, that may serve both as a mechanistic tool in the study of photoinitiated radical processes in polymer films and in the preparation of functional fluorescent images.
Collapse
Affiliation(s)
- Chris Coenjarts
- Department of Chemistry, University of Ottawa, Canada K1N 6N5
| | | | | | | | | | | |
Collapse
|