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Akl HN, Salah D, Abdel-Samad HS, Abdel Aziz AA, Abdel-Shafi AA. Fractional dependence of the free energy of activation on the driving force of charge transfer in the quenching of the excited states of substituted phenanthroline homoleptic ruthenium(ii) complexes in aqueous medium. RSC Adv 2023; 13:13314-13323. [PMID: 37143702 PMCID: PMC10152132 DOI: 10.1039/d3ra01280h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 04/22/2023] [Indexed: 05/06/2023] Open
Abstract
The photophysical characteristics of some homoleptic ruthenium(ii) phenanthroline derivatives are investigated in aqueous medium. The lifetimes of the excited 3MLCT state of the studied complexes were found to be very sensitive to the type of the substituents on the phenanthroline ligand and were found to increase from about 0.96 μs in case of the parent [Ru(Phen)3]2+ complex to 2.97 μs in case of [Ru(DPPhen)3]2+. The transient absorption spectra of the current set of complexes were studied also in aqueous medium. Quenching of the excited 3MLCT states of the studied complexes by molecular oxygen were studied and quenching rate constants were found to be in the range 1.02-4.83 × 109 M-1 s-1. Values of singlet oxygen quantum yields were found to be in the range 0.01 to 0.25, and the corresponding efficiencies of singlet oxygen thereby produced, f T Δ, were in the range 0.03-0.52. The mechanism by which the excited 3MLCT state is quenched by oxygen is discussed in light of the spin statistical factor rate constants and the competition between charge transfer and non-charge transfer quenching pathways. The partial charge transfer parameters, p CT, were obtained and found to be about 0.88 for all complexes except for complexes with f T Δ values lower than 0.25. The correlation of the activation free energies ΔG ≠ of the exciplexes formation with the driving force for charge transfer, ΔG CET, gives a charge transfer character of the exciplexes of about 35.0%.
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Affiliation(s)
- Hossam N Akl
- Department of Chemistry, Faculty of Science, Ain Shams University 11566 Abbassia Cairo Egypt
| | - Dina Salah
- Department of Physics, Faculty of Science, Ain Shams University 11566 Abbassia Cairo Egypt
| | - Hesham S Abdel-Samad
- Department of Chemistry, Faculty of Science, Ain Shams University 11566 Abbassia Cairo Egypt
| | - Ayman A Abdel Aziz
- Department of Chemistry, Faculty of Science, Ain Shams University 11566 Abbassia Cairo Egypt
| | - Ayman A Abdel-Shafi
- Department of Chemistry, Faculty of Science, Ain Shams University 11566 Abbassia Cairo Egypt
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2
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Baptista MS, Cadet J, Greer A, Thomas AH. Practical Aspects in the Study of Biological Photosensitization Including Reaction Mechanisms and Product Analyses: A Do's and Don'ts Guide †. Photochem Photobiol 2022; 99:313-334. [PMID: 36575651 DOI: 10.1111/php.13774] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 12/24/2022] [Indexed: 12/29/2022]
Abstract
The interaction of light with natural matter leads to a plethora of photosensitized reactions. These reactions cause the degradation of biomolecules, such as DNA, lipids, proteins, being therefore detrimental to the living organisms, or they can also be beneficial by allowing the treatment of several diseases by photomedicine. Based on the molecular mechanistic understanding of the photosensitization reactions, we propose to classify them in four processes: oxygen-dependent (type I and type II processes) and oxygen-independent [triplet-triplet energy transfer (TTET) and photoadduct formation]. In here, these processes are discussed by considering a wide variety of approaches including time-resolved and steady-state techniques, together with solvent, quencher, and scavenger effects. The main aim of this survey is to provide a description of general techniques and approaches that can be used to investigate photosensitization reactions of biomolecules together with basic recommendations on good practices. Illustration of the suitability of these approaches is provided by the measurement of key biomarkers of singlet oxygen and one-electron oxidation reactions in both isolated and cellular DNA. Our work is an educational review that is mostly addressed to students and beginners.
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Affiliation(s)
- Maurício S Baptista
- Department of Biochemistry, Institute of Chemistry, Universidade de São Paulo, São Paulo, Brazil
| | - Jean Cadet
- Département de Médecine Nucléaire et de Radiobiologie, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | - Alexander Greer
- Department of Chemistry, Brooklyn College, Brooklyn, New York, USA.,Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York, USA
| | - Andrés H Thomas
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, La Plata, Argentina
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Pronkin PG, Tatikolov AS. Meso-aryl-substituted thiacarbocyanine dyes as spectral-fluorescent probes for DNA. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 269:120744. [PMID: 34929626 DOI: 10.1016/j.saa.2021.120744] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 12/01/2021] [Accepted: 12/09/2021] [Indexed: 06/14/2023]
Abstract
The noncovalent interaction of meso-aryl-substituted thiacarbocyanine dyes I and II with dsDNA and ssDNA in aqueous solutions has been studied by spectral-fluorescent methods. Complexation with DNA is accompanied by both aggregation of the dyes and the formation of monomeric strongly fluorescent complexes. Experiments on molecular docking of dyes I and II with dsDNA confirm the previous assumption about the possibility of the formation of complexes of different types: intercalation between base pairs and in the grooves of the double helix of the biopolymer. The possibility of intercalation of the dyes in the complex is confirmed by experiments on thermal dissociation of dsDNA in the presence of dyes I and II, as well as experiments on the interaction of the dyes with ssDNA. An increase in the melting temperatures Tm of dsDNA is obtained in the presence of I and II, similar to that observed for the classical intercalator ethidium bromide. The limits of detection and quantification of DNA, which are important for the use of the dyes as probes for DNA, have been determined. The primary photochemical processes of the dyes in complexes with ssDNA were studied by flash photolysis technique. Complexation with ssDNA hinders photoisomerization and creates favorable conditions for the dye triplet state formation. The decay kinetics of the triplet state of the dyes were monoexponential. The rate constant of quenching of the triplet state by air oxygen was estimated for dye I complexed with ssDNA and was found to be less than the diffusion-controlled limit. This is probably a consequence of the shielding effect of the complex on the triplet quenching process.
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Affiliation(s)
- Pavel G Pronkin
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin St. 4, Moscow 119334 Russia.
| | - Alexander S Tatikolov
- N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin St. 4, Moscow 119334 Russia.
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Parra GG, Correa DS, Silveira-Alves E, Almeida LM, Souza MAR, De Boni L, Misoguti L, Mendonça CR, Zílio SC, Barbosa Neto NM, Borissevitch IE, Gonçalves PJ. Effects of meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS 4) aggregation on its spectral and kinetic characteristics and singlet oxygen production. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 261:120063. [PMID: 34153547 DOI: 10.1016/j.saa.2021.120063] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 06/07/2021] [Indexed: 06/13/2023]
Abstract
The present work reports the effects of meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS4) aggregation on its excited states absorption spectra, triplet states quenching by molecular oxygen and singlet oxygen production. Experimental techniques such as optical absorption, Z-scan with a white light continuum source and the Laser Flash Photolysis were used to fulfil the study. J-aggregates possess reverse saturable absorption in the 505-660 nm spectral range with a peak centered close to 540 nm. These facts together with their fast relaxation time suggest that they can be employed as material for ultrafast optical limiting and switching. Even though aggregation reduces the porphyrin excited-state lifetimes and quantum yields, it does not reduce the probability of the contact between the quencher and the excited aggregate. Aggregation does not change the contribution of energy transfer mechanisms to triplet state quenching by molecular oxygen. The production of singlet oxygen, the intense absorption in the phototherapeutic window and the high efficiency of conversion of light energy into heat, allow consider J-aggregates as a theranostic agent for photomedicine. It is proposed to use J-aggregates for diagnostics by photoacoustic images and in combination with a near-infrared photodynamic/photothermal dual mode therapy, thus improving synergistically the therapeutic response.
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Affiliation(s)
- Gustavo G Parra
- Departamento de Física, FFCLRP, Universidade de São Paulo, Av. Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil
| | - Daniel S Correa
- EMBRAPA Instrumentação, Rua XV de Novembro, 1452, 13560-970 São Carlos, SP, Brazil
| | - Eli Silveira-Alves
- Instituto de Química, Universidade Federal de Goiás, 74001-970 Goiânia, GO, Brazil
| | - Luciane M Almeida
- Universidade Estadual de Goiás/UEG, BR-153 3105, Fazenda Barreiro do Meio, Campus Anápolis de Ciências Exatas e Tecnológicas, 75132-400 Anápolis, GO, Brazil
| | - Marcio A R Souza
- Instituto de Física, Universidade Federal de Goiás, 74001-970 Goiânia, GO, Brazil
| | - Leonardo De Boni
- Instituto de Física de São Carlos, Universidade de São Paulo, 13560-970 São Carlos, SP, Brazil
| | - Lino Misoguti
- Instituto de Física de São Carlos, Universidade de São Paulo, 13560-970 São Carlos, SP, Brazil
| | - Cleber R Mendonça
- Instituto de Física de São Carlos, Universidade de São Paulo, 13560-970 São Carlos, SP, Brazil
| | - Sérgio C Zílio
- Instituto de Física, Universidade Federal de Goiás, 74001-970 Goiânia, GO, Brazil; Instituto de Física de São Carlos, Universidade de São Paulo, 13560-970 São Carlos, SP, Brazil
| | - Newton M Barbosa Neto
- Faculdade de Física, Universidade Federal do Pará, Av. Augusto Correa, 01, Guamá, 66075-110 Belém, PA, Brazil
| | - Iouri E Borissevitch
- Departamento de Física, FFCLRP, Universidade de São Paulo, Av. Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil; Instituto de Física, Universidade Federal de Goiás, 74001-970 Goiânia, GO, Brazil.
| | - Pablo J Gonçalves
- Instituto de Química, Universidade Federal de Goiás, 74001-970 Goiânia, GO, Brazil; Instituto de Física, Universidade Federal de Goiás, 74001-970 Goiânia, GO, Brazil.
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Redman ZC, Wesolowski J, Tomco PL. Photochemical Pathways of Rotenone and Deguelin Degradation: Implications for Rotenoid Attenuation and Persistence in High-Latitude Lakes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:4974-4983. [PMID: 33724011 DOI: 10.1021/acs.est.1c00129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The direct and indirect photochemical degradation of rotenone (ROT) and deguelin (DEG), the primary reduced nicotinamide adenine dinucleotide-inhibiting rotenoid components of the piscicide CFT Legumine, were investigated under simulated sunlight conditions relevant to their dissipation from high-latitude surface waters. Photochemical degradation dominated the elimination of ROT and DEG from surface waters with half-lives ranging from 1.17 to 2.32 and 4.18 to 20.12 h for DEG and ROT, respectively, when the rotenoids were applied in the formulation CFT Legumine. We assessed enhanced degradation processes using argon-purged and cesium chloride-amended water, which demonstrated the rotenoids to rapidly decompose from excited triplet states. We further assessed the influence of reactive oxygen species by hydroxyl radical quenching and thermal generation of singlet oxygen. The studied reactive oxygen species did not significantly contribute; however, alcohols such as isopropanol may inhibit degradation by quenching ROT excited states or preventing intersystem crossing. Finally, we compared photochemical degradation in water collected from Hope Lake, Alaska, to a solution of Suwanee River fulvic acids, which demonstrated that dissolved organic matter (DOM) quality is a major factor that modulates ROT attenuation through a combination of shielding (light attenuation) and excited-state quenching mechanisms and is temperature-dependent. Molecular-level characterizations of DOM may help account for the site-specific degradation of these rotenoids in the environment.
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Affiliation(s)
- Zachary C Redman
- Department of Chemistry, College of Arts and Sciences, University of Alaska Anchorage, 3211 Providence Dr., Anchorage, Alaska 99508, United States
| | - Joshua Wesolowski
- Department of Chemistry, College of Arts and Sciences, University of Alaska Anchorage, 3211 Providence Dr., Anchorage, Alaska 99508, United States
| | - Patrick L Tomco
- Department of Chemistry, College of Arts and Sciences, University of Alaska Anchorage, 3211 Providence Dr., Anchorage, Alaska 99508, United States
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6
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Structural and computational investigation of an imine-based propeller-shaped macrocyclic cage. SN APPLIED SCIENCES 2021. [DOI: 10.1007/s42452-021-04255-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
AbstractIn this study, we present the synthesis, spectroscopic and structural characterization of self-assembling gem-dimethyl imine based molecular cage (IMC). Self-assembling macrocycles and cages have well-defined cavities and have extensive functionalities ranging from energy storage, liquid crystals, and catalysts to water splitting photo absorber. IMC has large voids i.e., 25% of the total crystal volume thus could accommodate wide substrates. The synthesized imine-based molecular cages are stabilized by coaxial π bonded networks and long-range periodic van der Waal and non-bonded contacts as observed from the crystal structure. IMC also has typical properties of soft condensed matter materials, hence theoretical prediction of stress and strain tensor along with thermophysical properties were computed on crystal system and were found to be stable. Molecular dynamics revealed IMC is stabilized by, strong interactions between the interstitial phenyl rings. Density functional theory (DFT) based physicochemical properties were evaluated and has band gap of around 2.38ev (520 nm) similar to various photocatalytic band gap materials.
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Thorning F, Strunge K, Jensen F, Ogilby PR. The complex between molecular oxygen and an organic molecule: modeling optical transitions to the intermolecular charge-transfer state. Phys Chem Chem Phys 2021; 23:15038-15048. [PMID: 34212959 DOI: 10.1039/d1cp01738a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The collision complex between the ground electronic state of an organic molecule, M, and ground state oxygen, O2(X3Σg-), can absorb light to produce an intermolecular charge transfer (CT) state, often represented simply as the M radical cation, M+˙, paired with the superoxide radical anion, O2-˙. Aspects of this transition have been the subject of numerous studies for ∼70 years, many of which address fundamental concepts in chemistry and physics. We now examine the extent to which the combination of Molecular Dynamics simulations and electronic structure response methods can model transitions to the toluene-O2 CT state. To account for the experimental spectra, we consider (a) the distribution of toluene-O2 geometries that contribute to the transitions, (b) a quantitative description of intermolecular CT, and (c) oxygen-induced local transitions in toluene that complement the CT transitions, specifically transitions that populate toluene triplet states. We find that the latter oxygen-induced local transitions play a prominent role on the long wavelength side of the spectrum commonly attributed to the intermolecular CT transition. Our calculations provide a new perspective on the seminal discussion between R. S. Mulliken and D. F. Evans on the nature of O2-dependent transitions in organic molecules, and bode well for modeling transitions to excited states with CT character in noncovalent weakly-bonded molecular complexes.
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Affiliation(s)
| | - Kris Strunge
- Chemistry Department, Aarhus University, DK-8000, Aarhus, Denmark.
| | - Frank Jensen
- Chemistry Department, Aarhus University, DK-8000, Aarhus, Denmark.
| | - Peter R Ogilby
- Chemistry Department, Aarhus University, DK-8000, Aarhus, Denmark.
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Bresolí-Obach R, Torra J, Zanocco RP, Zanocco AL, Nonell S. Singlet Oxygen Quantum Yield Determination Using Chemical Acceptors. Methods Mol Biol 2021; 2202:165-188. [PMID: 32857355 DOI: 10.1007/978-1-0716-0896-8_14] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Singlet oxygen (1O2) is the first electronic excited state of molecular oxygen. Due to its non-radical and non-ionic character as well as its mild reactivity, 1O2 has a pivotal role in cell signaling processes at low concentration, yet it is cytotoxic at high concentrations. Quantifying the production of 1O2, particularly in biological systems, is therefore essential for understanding and controlling its effects. 1O2 can be produced by chemical and biological reactions, yet its most common method of production is by photosensitization, whereby an initially photoexcited molecule transfers its acquired electronic energy to the dioxygen molecule. The efficiency of this process is characterized by the 1O2 production quantum yield, ΦΔ, which can be determined by directly monitoring its intrinsic weak near-infrared phosphorescence or indirectly by trapping it with a suitable acceptor, a process that can be monitored by common analytical techniques. Indirect methods are thus very popular, yet they may lead to severe errors if used incorrectly. Herein we describe the common aspects of indirect methods and propose a general step-by-step procedure for the determination of ΦΔ values. In addition, we identify the key experimental conditions that need to be controlled to obtain meaningful results.
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Affiliation(s)
- Roger Bresolí-Obach
- Institut Químic de Sarrià, Universitat Ramon Llull, Barcelona, Spain.,Department of Chemistry, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Joaquim Torra
- Institut Químic de Sarrià, Universitat Ramon Llull, Barcelona, Spain.,Madrid Institute for Advanced Studies in Nanoscience (IMDEA Nanoscience), Madrid, Spain
| | - Renzo P Zanocco
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Antonio L Zanocco
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Santi Nonell
- Institut Químic de Sarrià, Universitat Ramon Llull, Barcelona, Spain.
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Cheng YH, Belyaev A, Ho ML, Koshevoy IO, Chou PT. The distinct O 2 quenching mechanism between fluorescence and phosphorescence for dyes adsorbed on silica gel. Phys Chem Chem Phys 2020; 22:27144-27156. [PMID: 33226034 DOI: 10.1039/d0cp05182a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We herein aim to probe the emission quenched by O2 on silica gel. Our special focus is on the O2 quenching of the fluorescence of a series of organic D-π-A phosphonium compounds 1-3. The results show that the O2 quenching rate constants for the fluorescence of 1-3 are on the order of 1010 M-1 s-1, which are nearly on the same order as those measured for 1-3 and common organic compounds in solution. In yet another approach, the study of O2 quenching of phosphorescence in the solid phase indicates that the O2 quenching rate constant for the triplet state, i.e., , is smaller than by two orders of magnitude. Detailed investigation indicates that this distinction stems from the intrinsic O2 quenching rate constants for the singlet and triplet states subsequent to the formation of collisional complexes. In the absence of the solvent cage effect, is greatly influenced by the formation energy of the O2-dye CT complex, whereas in the solid phase is a nearly diffusion-controlled rate. Due to the larger distinction between and in the solid phase, O2 quenching of fluorescence is efficient for dyes in the solid phase. This leads to a feasible application of sensing O2 with regular fluorescent dyes adsorbed on porous solid substrates.
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Affiliation(s)
- Yu-Hsuan Cheng
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan.
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Buglak AA, Filatov MA, Hussain MA, Sugimoto M. Singlet oxygen generation by porphyrins and metalloporphyrins revisited: A quantitative structure-property relationship (QSPR) study. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112833] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Li B, Zhang TS, Xue J, Xie BB, Fang WH, Shen L. Theoretical studies on the photochemistry of 2-nitrofluorene in the gas phase and acetonitrile solution. Phys Chem Chem Phys 2020; 22:16772-16782. [PMID: 32662496 DOI: 10.1039/d0cp01969k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The photophysical and photochemical mechanisms of 2-nitrofluorene (2-NF) in the gas phase and acetonitrile solution have been studied theoretically. Upon ∼330 nm irradiation to the first bright state (1ππ*), the 2-NF system can decay to triplet excited states via rapid intersystem crossing (ISC) processes through different surface crossing points or to the ground state via an ultrafast internal conversion (IC) process through the S1/S0 conical intersection. The 1nπ* dark state will serve as a bridge when the system leaves the Franck-Condon (FC) region and approaches to the S1 minimum. The molecule maintains a planar geometry during the excited-state relaxation processes. The differences on excitation properties such as electronic configurations and spin-orbit coupling (SOC) interactions between those in the gas phase and acetonitrile solution cannot be neglected, indicating possible changes on the efficiency of the related ISC processes for the 2-NF system in solution. Once arrived at the T1 state, it would further decay to the S0 state or photodegrade into the Ar-O˙ and NO˙ free radicals. During the intramolecular rearrangement process, the twisting of the nitro group out of the aromatic-ring plane is regarded as a critical structural variation for the photodegradation of the 2-NF system. The free radicals finally form through oxaziridine-type intermediate and transition state structures. The present work provides important mechanistic insights to the photochemistry of nitro-substituted polyaromatic compounds.
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Affiliation(s)
- Bo Li
- Hangzhou Institute of Advanced Studies, Zhejiang Normal University, 1108 Gengwen Road, Hangzhou 311231, Zhejiang, P. R. China.
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Motta LC, Kritee K, Blum JD, Tsz-Ki Tsui M, Reinfelder JR. Mercury Isotope Fractionation during the Photochemical Reduction of Hg(II) Coordinated with Organic Ligands. J Phys Chem A 2020; 124:2842-2853. [DOI: 10.1021/acs.jpca.9b06308] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Laura C. Motta
- Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - K. Kritee
- Environmental Defense Fund, Boulder, Colorado 80302, United States
| | - Joel D. Blum
- Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109, United States
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Martin Tsz-Ki Tsui
- Department of Biology, University of North Carolina at Greensboro, North Carolina 27402, United States
| | - John R. Reinfelder
- Department of Environmental Sciences, Rutgers University, New Brunswick, New Jersey 08901, United States
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Urieta-Mora J, Krug M, Alex W, Perles J, Fernández I, Molina-Ontoria A, Guldi DM, Martín N. Homo and Hetero Molecular 3D Nanographenes Employing a Cyclooctatetraene Scaffold. J Am Chem Soc 2019; 142:4162-4172. [DOI: 10.1021/jacs.9b10203] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Javier Urieta-Mora
- Departamento Química Orgánica, Facultad C. C. Químicas, Universidad Complutense de Madrid, Av. Complutense s/n, 28040 Madrid, Spain
- IMDEA-Nanociencia, C/Faraday 9, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
| | - Marcel Krug
- Department of Chemistry and Pharmacy Friedrich-Alexander-Universität, Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Wiebke Alex
- Department of Chemistry and Pharmacy Friedrich-Alexander-Universität, Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Josefina Perles
- Single Crystal X-ray Diffraction Laboratory, Interdepartmental Research Service (SIdI), Universidad Autónoma de Madrid Cantoblanco, 28049 Madrid, Spain
| | - Israel Fernández
- Departamento Química Orgánica, Facultad C. C. Químicas, Universidad Complutense de Madrid, Av. Complutense s/n, 28040 Madrid, Spain
| | - Agustín Molina-Ontoria
- IMDEA-Nanociencia, C/Faraday 9, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
| | - Dirk M. Guldi
- Department of Chemistry and Pharmacy Friedrich-Alexander-Universität, Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Nazario Martín
- Departamento Química Orgánica, Facultad C. C. Químicas, Universidad Complutense de Madrid, Av. Complutense s/n, 28040 Madrid, Spain
- IMDEA-Nanociencia, C/Faraday 9, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
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Suenobu T, Arahori I, Nakayama KI, Suzuki T, Katoh R, Nakagawa T. Reaction of Oxygen with the Singlet Excited State of [n]Cycloparaphenylenes (n = 9, 12, and 15): A Time-Resolved Transient Absorption Study Seamlessly Covering Time Ranges from Subnanoseconds to Microseconds by the Randomly-Interleaved-Pulse-Train Method. J Phys Chem A 2019; 124:46-55. [DOI: 10.1021/acs.jpca.9b09846] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tomoyoshi Suenobu
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Ikuya Arahori
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Ken-ichi Nakayama
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | | | - Ryuzi Katoh
- College of Engineering, Nihon University, Koriyama, Fukushima 963-8642, Japan
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Kuncewicz J, Dąbrowski JM, Kyzioł A, Brindell M, Łabuz P, Mazuryk O, Macyk W, Stochel G. Perspectives of molecular and nanostructured systems with d- and f-block metals in photogeneration of reactive oxygen species for medical strategies. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.07.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Smit JH, van der Velde JHM, Huang J, Trauschke V, Henrikus SS, Chen S, Eleftheriadis N, Warszawik EM, Herrmann A, Cordes T. On the impact of competing intra- and intermolecular triplet-state quenching on photobleaching and photoswitching kinetics of organic fluorophores. Phys Chem Chem Phys 2019; 21:3721-3733. [PMID: 30499568 DOI: 10.1039/c8cp05063e] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
While buffer cocktails remain the most commonly used method for photostabilization and photoswitching of fluorescent markers, intramolecular triplet-state quenchers emerge as an alternative strategy to impart fluorophores with 'self-healing' or even functional properties such as photoswitching. In this contribution, we evaluated combinations of both approaches and show that inter- and intramolecular triplet-state quenching processes compete with each other. We find that although the rate of triplet-state quenching is additive, the photostability is limited by the faster pathway. Often intramolecular processes dominate the photophysical situation for combinations of covalently-linked and solution-based photostabilizers and photoswitching agents. Furthermore we show that intramolecular photostabilizers can protect fluorophores from reversible off-switching events caused by solution-additives, which was previously misinterpreted as photobleaching. Our studies also provide practical guidance for usage of photostabilizer-dye conjugates for STORM-type super-resolution microscopy permitting the exploitation of their improved photophysics for increased spatio-temporal resolution. Finally, we provide evidence that the biochemical environment, e.g., proximity of aromatic amino-acids such as tryptophan, reduces the photostabilization efficiency of commonly used buffer cocktails. Not only have our results important implications for a deeper mechanistic understanding of self-healing dyes, but they will provide a general framework to select label positions for optimal and reproducible photostability or photoswitching kinetics in different biochemical environments.
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Affiliation(s)
- Jochem H Smit
- Molecular Microscopy Research Group, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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17
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Mikrut M, Regiel-Futyra A, Samek L, Macyk W, Stochel G, van Eldik R. Generation of hydroxyl radicals and singlet oxygen by particulate matter and its inorganic components. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 238:638-646. [PMID: 29614473 DOI: 10.1016/j.envpol.2018.03.068] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 02/12/2018] [Accepted: 03/20/2018] [Indexed: 06/08/2023]
Abstract
Particulate matter (PM) can strongly affect redox biochemistry and therefore induce the response of the immune system and aggravate the course of autoimmune diseases. Nanoparticles containing transition metal compounds possessing semiconductor properties (TiO2, ZnO) may act as photocatalysts and accelerate the generation of reactive oxygen species (ROS) and reactive nitrogen species (RNS). In this study, the NIST standard reference material, SRM 1648a, has been analyzed in terms of this consideration. Organic compounds present in SRM 1648a were removed by cold oxygen plasma treatment. Samples of SRM 1648a with removed organic content (<2% of organic carbon, <1% of nitrogen) were obtained within 2 h of this treatment. The treatment did not affect the morphology of the powder. The reference material and PM2.5 collected in Kraków are composed of smaller particles and nanoparticles forming aggregates. The efficiency of (photo)generation of hydroxyl radicals and singlet oxygen was compared for original and organics-free samples. The analyzed samples showed the highest activity towards ROS generation when exposed to UV-vis-NIR light, moderate under UV irradiation, and the lowest in dark. Data collected in the present study suggest that the organic fraction is mostly responsible for singlet oxygen generation, as almost twice higher efficiency of 1O2 generation was observed for the original NIST sample compared to the material without the organic fraction. However, particulate matter collected in Kraków was found to have a five times higher activity in singlet oxygen generation (compared for original NIST and Kraków dust samples).
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Affiliation(s)
- Magdalena Mikrut
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Kraków, Poland
| | - Anna Regiel-Futyra
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Kraków, Poland
| | - Lucyna Samek
- Faculty of Physics and Applied Computer Science, AGH-UST University of Science and Technology, Al. Mickiewicza 30, 30-059, Kraków, Poland
| | - Wojciech Macyk
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Kraków, Poland.
| | - Grażyna Stochel
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Kraków, Poland
| | - Rudi van Eldik
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Kraków, Poland; Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Egerlandstr. 1, 91058, Erlangen, Germany.
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18
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Horiuchi H, Sakai A, Akiyama S, Ikeda R, Ito S, Furuya M, Gomibuchi Y, Ichikawa M, Yoshihara T, Tobita S, Okutsu T. Extension of π-system of silylated porphyrin derivative for photodynamic therapy. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.02.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Horiuchi H, Terashima K, Sakai A, Suda D, Yoshihara T, Kobayashi A, Tobita S, Okutsu T. The effect of central metal on the photodynamic properties of silylated tetraphenylporphyrin derivative. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2016.01.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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20
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Buglak AA, Telegina TA, Kritsky MS. A quantitative structure–property relationship (QSPR) study of singlet oxygen generation by pteridines. Photochem Photobiol Sci 2016; 15:801-11. [DOI: 10.1039/c6pp00084c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Singlet oxygen production quantum yields of pteridine photosensitizers were analyzed with the QSPR method. The ability of pterins and flavins to generate1O2in D2O correlated withEHOMOand electronegativity, as well as with the dipole moment and some other parameters.
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Affiliation(s)
- Andrey A. Buglak
- A.N. Bach Institute of Biochemistry
- Research Center of Biotechnology of the Russian Academy of Sciences
- Moscow
- Russia
| | - Taisiya A. Telegina
- A.N. Bach Institute of Biochemistry
- Research Center of Biotechnology of the Russian Academy of Sciences
- Moscow
- Russia
| | - Mikhail S. Kritsky
- A.N. Bach Institute of Biochemistry
- Research Center of Biotechnology of the Russian Academy of Sciences
- Moscow
- Russia
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21
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Abdel-Shafi AA, Hassanin HA, Al-Shihry SS. Partial charge transfer contribution to the solvent isotope effect and photosensitized generation of singlet oxygen, O2(1Δg), by substituted ruthenium(II) bipyridyl complexes in aqueous media. Photochem Photobiol Sci 2015; 13:1330-7. [PMID: 25026362 DOI: 10.1039/c4pp00117f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The efficiency of singlet oxygen photosensitized by some ruthenium(ii) bipyridyl complex ions in aqueous media is reported in this study. Measurements were carried out in H2O and D2O. The effect of the deuterium isotope on the lifetime of (3)MLCT excited states of these complexes is studied in H2O and D2O. The deuterium isotope effect was discussed in terms of the vibronic coupling to the solvent in addition to the charge transfer to the solvent mechanism due to their dependence on the oxidation potential of the sensitizer. Quenching rate constants, kq, for quenching of the (3)MLCT states of these ruthenium complex ions by molecular oxygen were found to be in the range of (2.08-3.84) × 10(9) M(-1) s(-1) in H2O and (1.69-3.48) × 10(9) M(-1) s(-1) in D2O. The efficiency of singlet oxygen, O2((1)Δg), production as a result of the (3)MLCT quenching by oxygen, f, is reported in D2O and found to be in the range 0.25-0.56. It has been found that the lifetime of the excited state is longer in D2O, τ, than in H2O, τ, which was related to partial charge transfer to the solvent in addition to the vibronic coupling mechanism. Mechanisms by which the excited states of these ruthenium complexes are quenched by molecular oxygen that shows the competition between charge transfer, non-charge transfer deactivation channels or energy transfer assisted charge transfer deactivation mechanisms are reported.
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Affiliation(s)
- Ayman A Abdel-Shafi
- Department of Chemistry, College of Science, King Faisal University, P.O. Box 400 Hufof, 31982, Al-Hassa, Saudi Arabia.
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22
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Voiciuk V, Redeckas K, Martynaitis V, Steponavičiūtė R, Šačkus A, Vengris M. Redefining the established understanding of excitation dynamics of photochromic oxazines. Phys Chem Chem Phys 2015; 17:17828-37. [PMID: 26087921 DOI: 10.1039/c5cp02143j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Since the introduction of photochromic indolo-benzoxazines, difference absorption of these photoexcited compounds has been assigned to the ground state of the ring-opened isomer. This assignment relies on the alleged resemblance of the spectra of photo- and chemically induced forms. In this paper, we expose the issue of the discrepancy between the absorption spectra of photoproducts and the corresponding chemically opened forms. As a result, a substantial change in the current explanation of photodynamics of photochromic oxazines is proposed. The spectral features earlier ascribed to the photoproduct are suggested to arise due to the absorption of the triplet state. This hypothesis was tested and confirmed in acetonitrile by measuring the effect of oxygen quenching of photoproduct states. In view of this interpretation, light-induced ring opening does not occur in indolo-benzoxazines dissolved in acetonitrile, and, consequently these molecules should no longer be regarded as molecular switches. On the other hand, we show that methanol solution under UV light does produce small amounts of ring-opened form of the molecule.
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Affiliation(s)
- V Voiciuk
- Department of Quantum Electronics, Vilnius University, Saulėtekio al. 9, LT-10222 Vilnius, Lithuania.
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23
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Oderinde MS, Varela-Alvarez A, Aquila B, Robbins DW, Johannes JW. Effects of Molecular Oxygen, Solvent, and Light on Iridium-Photoredox/Nickel Dual-Catalyzed Cross-Coupling Reactions. J Org Chem 2015; 80:7642-51. [DOI: 10.1021/acs.joc.5b01193] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Martins S. Oderinde
- Chemistry
Department (Oncology), AstraZeneca Pharmaceuticals LP, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Adrian Varela-Alvarez
- Chemistry
Department (Oncology), AstraZeneca Pharmaceuticals LP, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Brian Aquila
- Chemistry
Department (Oncology), AstraZeneca Pharmaceuticals LP, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Daniel W. Robbins
- Chemistry
Department (Oncology), AstraZeneca Pharmaceuticals LP, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
| | - Jeffrey W. Johannes
- Chemistry
Department (Oncology), AstraZeneca Pharmaceuticals LP, 35 Gatehouse Drive, Waltham, Massachusetts 02451, United States
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24
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El-Daly SA, Ebeid E. Spectroscopic studies, fluorescence quenching by molecular oxygen and amplified spontaneous emission of 1,4-bis [2-(2-pyridyl) vinyl] benzene (P2VB) diolefinic laser dye. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.01.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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25
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Asturiol D, Barbatti M. Electronic states of porphycene-O2 complex and photoinduced singlet O2 production. J Chem Phys 2013; 139:074307. [DOI: 10.1063/1.4818490] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Photophysical characterization of the plant growth regulator 2-(1-naphthyl) acetamide. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2013.05.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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27
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Zou Q, Fang Y, Zhao Y, Zhao H, Wang Y, Gu Y, Wu F. Synthesis and in Vitro Photocytotoxicity of Coumarin Derivatives for One- and Two-Photon Excited Photodynamic Therapy. J Med Chem 2013; 56:5288-94. [PMID: 23763331 DOI: 10.1021/jm400025g] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Qianli Zou
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing
100190, P. R. China
- Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yanyan Fang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing
100190, P. R. China
- Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yuxia Zhao
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing
100190, P. R. China
| | - Hongyou Zhao
- Department
of Laser Medicine, Chinese PLA General Hospital, Beijing 100853, P. R. China
| | - Ying Wang
- Department
of Laser Medicine, Chinese PLA General Hospital, Beijing 100853, P. R. China
| | - Ying Gu
- Department
of Laser Medicine, Chinese PLA General Hospital, Beijing 100853, P. R. China
| | - Feipeng Wu
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing
100190, P. R. China
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28
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Natarajan A, Burns A, Takemori M, Jain S, Boden E, Vasudevan V, Puthamane K, Naik SN, Kuriakose G. Pyrophthalones as blue wavelength absorbers in thermoplastic media. Photochem Photobiol 2011; 88:250-6. [PMID: 22077769 DOI: 10.1111/j.1751-1097.2011.01036.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have explored the utility of pyrophthalones as violet-blue light filtering dyes in polymer matrices for wavelengths below 450 nm. Further, we have investigated the photodegradation of these molecules in thermoplastic media and the mechanisms behind their degradation. Finally, a range of additives have been explored to improve the photostability of these molecules to achieve the desired performance.
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29
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Ganini D, Christoff M, Ehrenshaft M, Kadiiska MB, Mason RP, Bechara EJH. Myoglobin-H2O2 catalyzes the oxidation of β-ketoacids to α-dicarbonyls: mechanism and implications in ketosis. Free Radic Biol Med 2011; 51:733-43. [PMID: 21609760 PMCID: PMC3619417 DOI: 10.1016/j.freeradbiomed.2011.05.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 04/14/2011] [Accepted: 05/02/2011] [Indexed: 11/24/2022]
Abstract
Acetoacetate (AA) and 2-methylacetoacetate (MAA) are accumulated in metabolic disorders such as diabetes and isoleucinemia. Here we examine the mechanism of AA and MAA aerobic oxidation initiated by myoglobin (Mb)/H(2)O(2). We propose a chemiluminescent route involving a dioxetanone intermediate whose thermolysis yields triplet α-dicarbonyl species (methylglyoxal and diacetyl). The observed ultraweak chemiluminescence increased linearly on raising the concentration of either Mb (10-500 μM) or AA (10-100 mM). Oxygen uptake studies revealed that MAA is almost a 100-fold more reactive than AA. EPR spin-trapping studies with MNP/MAA revealed the intermediacy of an α-carbon-centered radical and acetyl radical. The latter radical, probably derived from triplet diacetyl, is totally suppressed by sorbate, a well-known quencher of triplet carbonyls. Furthermore, an EPR signal assignable to MNP-AA(•) adduct was observed and confirmed by isotope effects. Oxygen consumption and α-dicarbonyl yield were shown to be dependent on AA or MAA concentrations (1-50 mM) and on H(2)O(2) or tert-butOOH added to the Mb-containing reaction mixtures. That ferrylMb is involved in a peroxidase cycle acting on the substrates is suggested by the reaction pH profiles and immunospin-trapping experiments. The generation of radicals and triplet dicarbonyl products by Mb/H(2)O(2)/β-ketoacids may contribute to the adverse health effects of ketogenic unbalance.
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Affiliation(s)
- Douglas Ganini
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Marcelo Christoff
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Marilyn Ehrenshaft
- Free Radical Metabolism Group, Laboratory of Toxicology and Pharmacology, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC 27709, USA
| | - Maria B Kadiiska
- Free Radical Metabolism Group, Laboratory of Toxicology and Pharmacology, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC 27709, USA
| | - Ronald P Mason
- Free Radical Metabolism Group, Laboratory of Toxicology and Pharmacology, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC 27709, USA
| | - Etelvino JH Bechara
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
- Departamento de Ciências Exatas e da Terra, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Diadema, SP, Brazil
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30
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Silylation enhancement of photodynamic activity of tetraphenylporphyrin derivative. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2011.04.032] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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31
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Netto-Ferreira JC, Heyne B, Scaiano JC. Photophysics and photochemistry of aflatoxins B1 and B2. Photochem Photobiol Sci 2011; 10:1701-8. [DOI: 10.1039/c1pp05103b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Nuin E, Andreu I, Torres MJ, Jiménez M.C, Miranda MA. Enhanced Photosafety of Cinacalcet upon Complexation with Serum Albumin. J Phys Chem B 2010; 115:1158-64. [DOI: 10.1021/jp1069576] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Edurne Nuin
- Departamento de Química-Instituto de Tecnología Química (UPV-CSIC), Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
| | - Inmaculada Andreu
- Departamento de Química-Instituto de Tecnología Química (UPV-CSIC), Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
| | - M. José Torres
- Allergy Service, Research Laboratory, Carlos Haya Hospital, Málaga, Spain
| | - M .Consuelo Jiménez
- Departamento de Química-Instituto de Tecnología Química (UPV-CSIC), Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
| | - Miguel A. Miranda
- Departamento de Química-Instituto de Tecnología Química (UPV-CSIC), Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
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33
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Woodka MD, Schnee VP, Polcha MP. Fluorescent Polymer Sensor Array for Detection and Discrimination of Explosives in Water. Anal Chem 2010; 82:9917-24. [DOI: 10.1021/ac102504t] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marc D. Woodka
- RDECOM CERDEC Night Vision and Electronic Sensors Directorate, United States Army, Fort Belvoir, Virginia 22060, United States
| | - Vincent P. Schnee
- RDECOM CERDEC Night Vision and Electronic Sensors Directorate, United States Army, Fort Belvoir, Virginia 22060, United States
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34
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Bañuelos-Prieto J, Agarrabeitia AR, Garcia-Moreno I, Lopez-Arbeloa I, Costela A, Infantes L, Perez-Ojeda ME, Palacios-Cuesta M, Ortiz MJ. Controlling Optical Properties and Function of BODIPY by Using Asymmetric Substitution Effects. Chemistry 2010; 16:14094-105. [DOI: 10.1002/chem.201002095] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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35
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36
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Ogilby PR. Singlet oxygen: there is indeed something new under the sun. Chem Soc Rev 2010; 39:3181-209. [PMID: 20571680 DOI: 10.1039/b926014p] [Citation(s) in RCA: 831] [Impact Index Per Article: 59.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Singlet oxygen, O(2)(a(1)Delta(g)), the lowest excited electronic state of molecular oxygen, has been known to the scientific community for approximately 80 years. It has a characteristic chemistry that sets it apart from the triplet ground state of molecular oxygen, O(2)(X(3)Sigma), and is important in fields that range from atmospheric chemistry and materials science to biology and medicine. For such a "mature citizen", singlet oxygen nevertheless remains at the cutting-edge of modern science. In this critical review, recent work on singlet oxygen is summarized, focusing primarily on systems that involve light. It is clear that there is indeed still something new under the sun (243 references).
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Affiliation(s)
- Peter R Ogilby
- Center for Oxygen Microscopy and Imaging, Department of Chemistry, Aarhus University, DK-8000, Arhus, Denmark.
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37
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Brigante M, Charbouillot T, Vione D, Mailhot G. Photochemistry of 1-Nitronaphthalene: A Potential Source of Singlet Oxygen and Radical Species in Atmospheric Waters. J Phys Chem A 2010; 114:2830-6. [DOI: 10.1021/jp910203y] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marcello Brigante
- Laboratoire de Photochimie Moléculaire et Macromoléculaire, Clermont Université, Université Blaise Pascal, BP 10448, F-63000, Clermont-Ferrand, France, Laboratoire de Photochimie Moléculaire et Macromoléculaire, CNRS, UMR 6505, F-63177 Aubière, France, and Dipartimento di Chimica Analitica, Università di Torino, Via P. Giuria 5, 10125 Torino, Italy
| | - Tiffany Charbouillot
- Laboratoire de Photochimie Moléculaire et Macromoléculaire, Clermont Université, Université Blaise Pascal, BP 10448, F-63000, Clermont-Ferrand, France, Laboratoire de Photochimie Moléculaire et Macromoléculaire, CNRS, UMR 6505, F-63177 Aubière, France, and Dipartimento di Chimica Analitica, Università di Torino, Via P. Giuria 5, 10125 Torino, Italy
| | - Davide Vione
- Laboratoire de Photochimie Moléculaire et Macromoléculaire, Clermont Université, Université Blaise Pascal, BP 10448, F-63000, Clermont-Ferrand, France, Laboratoire de Photochimie Moléculaire et Macromoléculaire, CNRS, UMR 6505, F-63177 Aubière, France, and Dipartimento di Chimica Analitica, Università di Torino, Via P. Giuria 5, 10125 Torino, Italy
| | - Gilles Mailhot
- Laboratoire de Photochimie Moléculaire et Macromoléculaire, Clermont Université, Université Blaise Pascal, BP 10448, F-63000, Clermont-Ferrand, France, Laboratoire de Photochimie Moléculaire et Macromoléculaire, CNRS, UMR 6505, F-63177 Aubière, France, and Dipartimento di Chimica Analitica, Università di Torino, Via P. Giuria 5, 10125 Torino, Italy
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38
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Siegert S, Vogeler F, Schiedt J, Weinkauf R. Direct spectroscopy of contact charge transfer states: Possible consequences for tryptophan excited-state deactivation pathways by O2 and formation of reactive oxygen species. Phys Chem Chem Phys 2010; 12:4996-5006. [DOI: 10.1039/b926289j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Jensen PG, Arnbjerg J, Tolbod LP, Toftegaard R, Ogilby PR. Influence of an Intermolecular Charge-Transfer State on Excited-State Relaxation Dynamics: Solvent Effect on the Methylnaphthalene−Oxygen System and its Significance for Singlet Oxygen Production. J Phys Chem A 2009; 113:9965-73. [DOI: 10.1021/jp905728d] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Poul-Gudmund Jensen
- Center for Oxygen Microscopy and Imaging, Department of Chemistry, Aarhus University, DK-8000 Århus, Denmark
| | - Jacob Arnbjerg
- Center for Oxygen Microscopy and Imaging, Department of Chemistry, Aarhus University, DK-8000 Århus, Denmark
| | - Lars Poulsen Tolbod
- Center for Oxygen Microscopy and Imaging, Department of Chemistry, Aarhus University, DK-8000 Århus, Denmark
| | - Rasmus Toftegaard
- Center for Oxygen Microscopy and Imaging, Department of Chemistry, Aarhus University, DK-8000 Århus, Denmark
| | - Peter R. Ogilby
- Center for Oxygen Microscopy and Imaging, Department of Chemistry, Aarhus University, DK-8000 Århus, Denmark
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Garcia-Moreno I, Costela A, Pintado-Sierra M, Martin V, Sastre R. Efficient Red-Edge Materials Photosensitized by Rhodamine 640. J Phys Chem B 2009; 113:10611-8. [DOI: 10.1021/jp904419j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Inmaculada Garcia-Moreno
- Instituto de Química-Física “Rocasolano”, CSIC, Serrano 119, 28006 Madrid, Spain, Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Angel Costela
- Instituto de Química-Física “Rocasolano”, CSIC, Serrano 119, 28006 Madrid, Spain, Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Mercedes Pintado-Sierra
- Instituto de Química-Física “Rocasolano”, CSIC, Serrano 119, 28006 Madrid, Spain, Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Virginia Martin
- Instituto de Química-Física “Rocasolano”, CSIC, Serrano 119, 28006 Madrid, Spain, Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Roberto Sastre
- Instituto de Química-Física “Rocasolano”, CSIC, Serrano 119, 28006 Madrid, Spain, Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
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Serrano-Pérez JJ, Olaso-González G, Merchán M, Serrano-Andrés L. Singlet oxygen generation in PUVA therapy studied using electronic structure calculations. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2009.04.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Mitigating unwanted photophysical processes for improved single-molecule fluorescence imaging. Biophys J 2009; 96:2371-81. [PMID: 19289062 DOI: 10.1016/j.bpj.2008.11.061] [Citation(s) in RCA: 169] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2008] [Revised: 11/12/2008] [Accepted: 11/17/2008] [Indexed: 01/12/2023] Open
Abstract
Organic fluorophores common to fluorescence-based investigations suffer from unwanted photophysical properties, including blinking and photobleaching, which limit their overall experimental performance. Methods to control such processes are particularly important for single-molecule fluorescence and fluorescence resonance energy transfer imaging where uninterrupted, stable fluorescence is paramount. Fluorescence and FRET-based assays have been carried out on dye-labeled DNA and RNA-based systems to quantify the effect of including small-molecule solution additives on the fluorescence and FRET behaviors of both cyanine and Alexa fluorophores. A detailed dwell time analysis of the fluorescence and FRET trajectories of more than 200,000 individual molecules showed that two compounds identified previously as triplet state quenchers, cyclooctatetraene, and Trolox, as well as 4-nitrobenzyl alcohol, act to favorably attenuate blinking, photobleaching, and influence the rate of photoresurrection in a concentration-dependent and context-dependent manner. In both biochemical systems examined, a unique cocktail of compounds was shown to be optimal for imaging performance. By simultaneously providing the most rapid and direct access to multiple photophysical kinetic parameters, smFRET imaging provides a powerful avenue for future investigations aimed at discovering new compounds, and effective combinations thereof. These efforts may ultimately facilitate tuning organic dye molecule performance according to each specific experimental demand.
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Andrew TL, Swager TM. Reduced Photobleaching of Conjugated Polymer Films through Small Molecule Additives. Macromolecules 2008. [DOI: 10.1021/ma802050v] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Trisha L. Andrew
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
| | - Timothy M. Swager
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
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Tanaka F, Tsumura K, Furuta T, Iwamoto K, Okamoto M. Efficiencies of singlet oxygen production and rate constants for oxygen quenching in the S1state of dicyanonaphthalenes and related compounds. Photochem Photobiol Sci 2008; 7:56-62. [DOI: 10.1039/b711781g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Widengren J, Chmyrov A, Eggeling C, Löfdahl PA, Seidel CAM. Strategies to improve photostabilities in ultrasensitive fluorescence spectroscopy. J Phys Chem A 2007; 111:429-40. [PMID: 17228891 DOI: 10.1021/jp0646325] [Citation(s) in RCA: 169] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Given the particular importance of dye photostability for single-molecule and fluorescence fluctuation spectroscopy investigations, refined strategies were explored for how to chemically retard dye photobleaching. These strategies will be useful for fluorescence correlation spectroscopy (FCS), fluorescence-based confocal single-molecule detection (SMD) and related techniques. In particular, the effects on the addition of two main categories of antifading compounds, antioxidants (n-propyl gallate, nPG, ascorbic acid, AA) and triplet state quenchers (mercaptoethylamine, MEA, cyclo-octatetraene, COT), were investigated, and the relevant rate parameters involved were determined for the dye Rhodamine 6G. Addition of each of the compound categories resulted in significant improvements in the fluorescence brightness of the monitored fluorescent molecules in FCS measurements. For antioxidants, we identify the balance between reduction of photoionized fluorophores on the one hand and that of intact fluorophores on the other as an important guideline for what concentrations to be added for optimal fluorescence generation in FCS and SMD experiments. For nPG/AA, this optimal concentration was found to be in the lower micromolar range, which is considerably less than what has previously been suggested. Also, for MEA, which is a compound known as a triplet state quencher, it is eventually its antioxidative properties and the balance between reduction of fluorophore cation radicals and that of intact fluorophores that defines the optimal added concentration. Interestingly, in this optimal concentration range the triplet state quenching is still far from sufficient to fully minimize the triplet populations. We identify photoionization as the main mechanism of photobleaching within typical transit times of fluorescent molecules through the detection volume in a confocal FCS or SMD instrument (<1-20 ms), and demonstrate its generation via both one- and multistep excitation processes. Apart from reflecting a major pathway for photobleaching, our results also suggest the exploitation of the photoinduced ionization and the subsequent reduction by antioxidants for biomolecular monitoring purposes and as a possible switching mechanism with applications in high-resolution microscopy.
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Affiliation(s)
- Jerker Widengren
- Experimental Biomolecular Physics, Department of Applied Physics, Albanova University Center, Royal Institute of Technology, SE-10691 Stockholm, Sweden.
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Tanielian C, Mechin R, Seghrouchni R, Schweitzer C. Mechanistic and Kinetic Aspects of Photosensitization in the Presence of Oxygen †§. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2000)0710012makaop2.0.co2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Abdel-Shafi AA, Ward MD, Schmidt R. Mechanism of quenching by oxygen of the excited states of ruthenium(ii) complexes in aqueous media. Solvent isotope effect and photosensitized generation of singlet oxygen, O2(1Δg), by [Ru(diimine)(CN)4]2−complex ions. Dalton Trans 2007:2517-27. [PMID: 17563787 DOI: 10.1039/b704895e] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study we report on the photophysical properties of some [RuL(CN)4](2-) complex ions where L = 2,2'-bipyridine (bpy), 5,5'-dimethyl-2,2'-bipyridine (dmb), 1,10-phenanthroline (phen), 1-ethyl-2-(2-pyridyl)benzimidazole (pbe), 2,2':6',2'''-terpyridine (tpy) and [RuL3](2+) where L = bpy or phen. Measurements were carried out in H2O and D2O. The effect of the deuterium isotope effect on the lifetime of these complexes is discussed. It has also been found that the presence of cyano groups has a pronounced effect on the lifetime of the excited metal-to-ligand charge transfer ((3)MLCT) of these complexes. Quenching of the (3)MLCT states by oxygen is reported in H2O and D2O. The rate constants, k(q), for quenching of the (3)MLCT states of these ruthenium complex ions by molecular oxygen are in the range (2.55 to 7.01) x 10(9) M(-1) s(-1) in H2O and (3.38 to 5.69) x 10(9) M(-1) s(-1) in D2O. The efficiency of singlet oxygen, O2((1)Delta(g)), production as a result of the (3)MLCT quenching by oxygen, f(Delta)(T), is reported in D2O and found to be in the range 0.29-0.52. The rate constants, k(q)(Delta), for quenching of singlet oxygen by ground state sensitizers in D2O is also reported and found to be in the range (0.15 to 3.46) x 10(7) M(-1) s(-1). The rate constants and the efficiency of singlet oxygen formation are quantitatively reproduced by a model that assumes the competition of a non-charge transfer (nCT) and a CT deactivation channel. nCT deactivation occurs from a fully established spin-statistical equilibrium of (1)(T1(3)Sigma) and (3)(T1(3)Sigma) encounter complexes by internal conversion (IC) to lower excited complexes that dissociate to yield O2((1)Delta(g)), and O2((3)Sigmag-). The balance between CT and nCT deactivation channels which is described by the relative contribution p(CT) of CT induced deactivation is discussed. The kinetic model proposed for the quenching of pi-pi* triplet states by oxygen can also be applied to the quenching of (3)MLCT states by oxygen.
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Affiliation(s)
- Ayman A Abdel-Shafi
- Department of Chemistry, Faculty of Science, Ain Shams University, 11566, Abbassia, Cairo, Egypt.
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Abdel-Shafi AA, Bourdelande JL, Ali SS. Photosensitized generation of singlet oxygen from rhenium(i) and iridium(iii) complexes. Dalton Trans 2007:2510-6. [PMID: 17563786 DOI: 10.1039/b705524b] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photophysical properties in dilute acetonitrile solution are reported for a number of iridium(III) and rhenium(I) complexes. The nature of the lowest excited state of the complexes under investigation is either metal-to-ligand charge transfer ((3)MLCT) or a ligand centred ((3)LC) state. Rate constants, k(q), for quenching of the lowest excited states by molecular oxygen are in the range 1.5 x 10(8) to 1.4 x 10(10) M(-1) s(-1). Efficiency of singlet oxygen production, f(Delta)(T), following oxygen quenching of the lowest excited states of these complexes, are in the range of 0.27-1.00. The rate constants and the efficiency of singlet oxygen formation are quantitatively reproduced by a model that assumes the competition between a non-charge transfer (nCT) and a CT deactivation channel. The balance between CT and nCT deactivation channels, which is described by the relative contribution p(CT) of CT induced deactivation, is discussed. The kinetic model is found to be successfully applied in the case of quenching of the excited triplet states of coordination compounds by oxygen in acetonitrile, as was proposed for the quenching of pi-pi* triplet states by oxygen.
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Affiliation(s)
- Ayman A Abdel-Shafi
- Department of Chemistry, Faculty of Science, Ain Shams University, 11566, Abbassia, Cairo, Egypt.
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Mancilha FS, DaSilveira Neto BA, Lopes AS, Moreira PF, Quina FH, Gonçalves RS, Dupont J. Are Molecular 5,8-π-Extended Quinoxaline Derivatives Good Chromophores for Photoluminescence Applications? European J Org Chem 2006. [DOI: 10.1002/ejoc.200600376] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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