1
|
Daliran S, Khajeh M, Oveisi AR, Albero J, García H. CsCu 2I 3 Nanoparticles Incorporated within a Mesoporous Metal-Organic Porphyrin Framework as a Catalyst for One-Pot Click Cycloaddition and Oxidation/Knoevenagel Tandem Reaction. ACS APPLIED MATERIALS & INTERFACES 2022; 14:36515-36526. [PMID: 35939817 PMCID: PMC9940116 DOI: 10.1021/acsami.2c04364] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 07/26/2022] [Indexed: 06/15/2023]
Abstract
Metal-organic frameworks (MOFs) and metal halide perovskites are currently under much investigation due to their unique properties and applications. Herein, an innovative strategy has been developed combining an iron-porphyrin MOF, PCN-222(Fe), and an in situ-grown CsCu2I3 nontoxic lead-free halide perovskite based on an earth-abundant metal that becomes incorporated within the MOF channels [CsCu2I3@PCN-222(Fe)]. Encapsulation was designed to decrease and control the particle size and increase the stability of CsCu2I3. The hybrid materials were characterized by various techniques including FE-SEM, elemental mapping and line scanning EDX, TEM, PXRD, UV-Vis DRS, BET surface area, XPS, and photoemission measurements. Hybrid CsCu2I3@PCN-222(Fe) materials were examined as heterogeneous multifunctional (photo)catalysts for copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) and one-pot selective photo-oxidation/Knoevenagel condensation cascade reaction. Interestingly, CsCu2I3@PCN-222(Fe) outperforms not only its individual components CsCu2I3 and PCN-222(Fe) but also other reported (photo)catalysts for these transformations. This is attributed to cooperation and synergistic effects of the PCN-222(Fe) host and CsCu2I3 nanocrystals. To understand the catalytic and photocatalytic mechanisms, control and inhibition experiments, electron paramagnetic resonance (EPR) measurements, and time-resolved phosphorescence were performed, revealing the main role of active species of Cu(I) in the click reaction and the superoxide ion (O2•-) and singlet oxygen (1O2) in the photocatalytic reaction.
Collapse
Affiliation(s)
- Saba Daliran
- Department
of Chemistry, University of Zabol, P.O. Box 98615-538, Zabol 98615-538, Iran
| | - Mostafa Khajeh
- Department
of Chemistry, University of Zabol, P.O. Box 98615-538, Zabol 98615-538, Iran
| | - Ali Reza Oveisi
- Department
of Chemistry, University of Zabol, P.O. Box 98615-538, Zabol 98615-538, Iran
| | - Josep Albero
- Departamento
de Química and Instituto de Tecnología Química
CSIC-UPV, Universitat Politècnica
de València, Av. de los Naranjos s/n, 46022 Valencia, Spain
| | - Hermenegildo García
- Departamento
de Química and Instituto de Tecnología Química
CSIC-UPV, Universitat Politècnica
de València, Av. de los Naranjos s/n, 46022 Valencia, Spain
| |
Collapse
|
2
|
Malek B, Lu W, Mohapatra PP, Walalawela N, Jabeen S, Liu J, Greer A. Probing the Transition State-to-Intermediate Continuum: Mechanistic Distinction between a Dry versus Wet Perepoxide in the Singlet Oxygen "Ene" Reaction at the Air-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6036-6048. [PMID: 35506607 DOI: 10.1021/acs.langmuir.2c00279] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A mechanistic study is reported for the reactions of singlet oxygen (1O2) with alkene surfactants of tunable properties. Singlet oxygen was generated either top-down (photochemically) by delivery as a gas to an air-water interface or bottom-up (chemically) by transport to the air-water interface as a solvated species. In both cases, reactions were carried out in the presence of 7-carbon (7C), 9-carbon (9C), or 11-carbon (11C) prenylsurfactants [(CH3)2C═CH(CH2)nSO3- Na+ (n = 4, 6, 8)]. Higher "ene" hydroperoxide regioselectivities (secondary ROOH 2 to tertiary ROOH 3) were reached in delivering 1O2 top-down through air as compared to bottom-up via aqueous solution. In the photochemical reaction, ratios of 2:3 increased from 2.5:1 for 7C, to 2.8:1 for 9C, and to 3.2:1 for 11C. In contrast, in the bubbling system that generated 1O2 chemically, the selectivity was all but lost, ranging only from 1.3:1 to 1:1. The phase-dependent regioselectivities appear to be correlated with the "ene" reaction with photochemically generated, drier 1O2 at the air-water interface vs those with wetter 1O2 from the bubbling reactor. Density functional theory-calculated reaction potential energy surfaces (PESs) were used to help rationalize the reaction phase dependence. The reactions in the gas phase are mediated by perepoxide transition states with 32-41 kJ/mol binding energy for C═C(π)···1O2. The perepoxide species, however, evolve to well-defined stationary structures in the aqueous phase, with covalent C-O bonds and 85-88 kJ/mol binding energy. The combined experimental and computational evidence points to a unique mechanism for 1O2 "ene" tunability in a perepoxide continuum from a transition state to an intermediate.
Collapse
Affiliation(s)
- Belaid Malek
- Department of Chemistry, Brooklyn College of the City University of New York, Brooklyn, New York 11210, United States
| | - Wenchao Lu
- Department of Chemistry and Biochemistry, Queens College of the City University of New York, 65-30 Kissena Blvd., Queens, New York 11367, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Prabhu Prasad Mohapatra
- Department of Chemistry, Brooklyn College of the City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Niluksha Walalawela
- Department of Chemistry, Brooklyn College of the City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Shakeela Jabeen
- Department of Chemistry, Brooklyn College of the City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Jianbo Liu
- Department of Chemistry and Biochemistry, Queens College of the City University of New York, 65-30 Kissena Blvd., Queens, New York 11367, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Alexander Greer
- Department of Chemistry, Brooklyn College of the City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| |
Collapse
|
3
|
Aebisher D, Bartusik-Aebisher D, Belh SJ, Ghosh G, Durantini AM, Liu Y, Xu Q, Lyons AM, Greer A. Superhydrophobic Surfaces as a Source of Airborne Singlet Oxygen through Free Space for Photodynamic Therapy. ACS APPLIED BIO MATERIALS 2020; 3:2370-2377. [DOI: 10.1021/acsabm.0c00114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- David Aebisher
- Faculty of Medicine, University of Rzeszów, 35-310 Rzeszów, Poland
| | | | - Sarah J. Belh
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 10314, United States
- Ph.D. Program in Chemistry, Graduate Center of City University of New York, New York, New York 10016, United States
| | - Goutam Ghosh
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 10314, United States
- Ph.D. Program in Chemistry, Graduate Center of City University of New York, New York, New York 10016, United States
| | - Andrés M. Durantini
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 10314, United States
- IDAS-CONICET, Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba X5804BYA, Argentina
| | - Yang Liu
- Ph.D. Program in Chemistry, Graduate Center of City University of New York, New York, New York 10016, United States
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
| | - QianFeng Xu
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
| | - Alan M. Lyons
- Ph.D. Program in Chemistry, Graduate Center of City University of New York, New York, New York 10016, United States
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
| | - Alexander Greer
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 10314, United States
- Ph.D. Program in Chemistry, Graduate Center of City University of New York, New York, New York 10016, United States
| |
Collapse
|
4
|
Zampini G, Planas O, Marmottini F, Gulías O, Agut M, Nonell S, Latterini L. Morphology effects on singlet oxygen production and bacterial photoinactivation efficiency by different silica-protoporphyrin IX nanocomposites. RSC Adv 2017. [DOI: 10.1039/c7ra00784a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Different silica-protoporphyrin IX (PpIX) nanocomposites have been synthesized to evaluate the dependence of singlet oxygen production and bacterial inactivation efficiency on the morphology of the nanomaterials.
Collapse
Affiliation(s)
- G. Zampini
- Department of Chemistry
- Biology and Biotechnology
- University of Perugia
- 06123 Perugia
- Italy
| | - O. Planas
- Institut Químic de Sarrià
- Universitat Ramon Llull
- Barcelona 08017
- Spain
| | - F. Marmottini
- Department of Chemistry
- Biology and Biotechnology
- University of Perugia
- 06123 Perugia
- Italy
| | - O. Gulías
- Institut Químic de Sarrià
- Universitat Ramon Llull
- Barcelona 08017
- Spain
| | - M. Agut
- Institut Químic de Sarrià
- Universitat Ramon Llull
- Barcelona 08017
- Spain
| | - S. Nonell
- Institut Químic de Sarrià
- Universitat Ramon Llull
- Barcelona 08017
- Spain
| | - L. Latterini
- Department of Chemistry
- Biology and Biotechnology
- University of Perugia
- 06123 Perugia
- Italy
| |
Collapse
|
5
|
Lacombe S, Pigot T. Materials for selective photo-oxygenation vs. photocatalysis: preparation, properties and applications in environmental and health fields. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01929j] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Photosensitizing materials made of organic dyes embedded in various supports are compared to usual supported TiO2-based photocatalysts.
Collapse
Affiliation(s)
- S. Lacombe
- IPREM UMR CNRS 5254
- Université de Pau et des Pays de l'Adour
- 64053 Pau Cedex
- France
| | - T. Pigot
- IPREM UMR CNRS 5254
- Université de Pau et des Pays de l'Adour
- 64053 Pau Cedex
- France
| |
Collapse
|
6
|
Synthesis, photophysical characterization, and photoinduced antibacterial activity of methylene blue-loaded amino- and mannose-targeted mesoporous silica nanoparticles. Molecules 2015; 20:6284-98. [PMID: 25859784 PMCID: PMC6272360 DOI: 10.3390/molecules20046284] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 03/29/2015] [Accepted: 04/02/2015] [Indexed: 01/01/2023] Open
Abstract
Over the last 20 years, the number of pathogenic multi-resistant microorganisms has grown steadily, which has stimulated the search for new strategies to combat antimicrobial resistance. Antimicrobial photodynamic therapy (aPDT), also called photodynamic inactivation, is emerging as a promising alternative to treatments based on conventional antibiotics. We have explored the effectiveness of methylene blue-loaded targeted mesoporous silica nanoparticles (MSNP) in the photodynamic inactivation of two Gram negative bacteria, namely Escherichia coli and Pseudomonas aeruginosa. For E. coli, nanoparticle association clearly reduced the dark toxicity of MB while preserving its photoinactivation activity. For P. aeruginosa, a remarkable difference was observed between amino- and mannose-decorated nanoparticles. The details of singlet oxygen production in the nanoparticles have been characterized, revealing the presence of two populations of this cytotoxic species. Strong quenching of singlet oxygen within the nanoparticles is observed.
Collapse
|
7
|
González-Béjar M, Liras M, Francés-Soriano L, Voliani V, Herranz-Pérez V, Duran-Moreno M, Garcia-Verdugo JM, Alarcon EI, Scaiano JC, Pérez-Prieto J. NIR excitation of upconversion nanohybrids containing a surface grafted Bodipy induces oxygen-mediated cancer cell death. J Mater Chem B 2014; 2:4554-4563. [PMID: 32261556 DOI: 10.1039/c4tb00340c] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
We report the preparation of water-dispersible, ca. 30 nm-sized nanohybrids containing NaYF4:Er3+, Yb3+ up-conversion nanoparticles (UCNPs), capped with a polyethylene glycol (PEG) derivative and highly loaded with a singlet oxygen photosensitizer, specifically a diiodo-substituted Bodipy (IBDP). The photosensitizer, bearing a carboxylic group, was anchored to the UCNP surface and, at the same time, embedded in the PEG capping; the combined action of the UCNP surface and PEG facilitated the loading for an effective energy transfer and, additionally, avoided photosensitizer leaching from the nanohybrid (UCNP-IBDP@PEG). The effectiveness of the nanohybrids in generating singlet oxygen after near-infrared (NIR) excitation (975 nm) with a continuous wavelength (CW) laser was evidenced by using a probe molecule. In vitro assays demonstrated that the UCNP-IBDP@PEG nanohybrid was taken up by the SH-SY5Y human neuroblastoma-derived cells showing low cytotoxicity. Moreover, ca. 50% cancer cell death was observed after NIR irradiation (45 min, 239 mW).
Collapse
Affiliation(s)
- María González-Béjar
- Instituto de Ciencia Molecular/ICMOL, Universidad de Valencia, C/José Beltrán 2, 46980, Paterna, Valencia, Spain.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Arzoumanian E, Ronzani F, Trivella A, Oliveros E, Sarakha M, Richard C, Blanc S, Pigot T, Lacombe S. Transparent organosilica photocatalysts activated by visible light: photophysical and oxidative properties at the gas-solid interface. ACS APPLIED MATERIALS & INTERFACES 2014; 6:275-288. [PMID: 24304089 DOI: 10.1021/am404175y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The photophysical properties of several photosensitizers (PSs) included or grafted in silica monoliths were compared to their properties in solution. The effects of the solid support on their steady-state and transient absorption spectra, on their quantum yields of singlet oxygen ((1)O2) production, and on their ability to photoinduce the oxidation of dimethylsulfide (DMS) were investigated. Two cyanoanthracene derivatives (9,14-dicyanobenzo[b]triphenylene, DBTP, and 9,10-dicyanoanthracene, DCA), as well as three phenothiazine dyes (methylene blue, MB(+), new methylene blue, NMB(+), methylene violet, MV), were encapsulated in silica, analyzed and compared to two reference PSs (perinaphthenone, PN and rose bengal, RB). A DBTP derivative (3-[N-(N″-triethoxysilylpropyl-N'-hexylurea)]carboxamido-9,14-dicyanobenzo[b]triphenylene, 3) was also prepared and grafted onto silica. Thanks to the transparency and the free-standing shape of the monoliths, the complete spectroscopic characterization of the supported PSs was carried out directly at the gas-solid interface. The influence of the silica network, the PS, and the adsorption/grafting link between the PS and silica was investigated. The effects of PS concentration, gaseous atmosphere, humidity, and hydrophobicity on the production of (1)O2 were analyzed. With all PSs, (1)O2 production was very efficient (quantum yields of (1)O2 production, relative to PN, between 0.6 and 1), and this species was the only one involved in the pollutant photooxidation. The influence of the matrix on the PSs' photophysics could be considered as negligible. In contrast, the matrix effect on DMS photooxidation was extremely important: the gas diffusion inside the porous structure, and thus, the photoactivity of the materials, strictly depended on silica's surface area and porosity. Our results highlight the suitability of these silica structures as inert supports for the study of the photosensitizing properties at the gas-solid interface. Moreover, thanks to the adsorption properties of the matrix, the synthesized materials can be used as microphotoreactor for the (1)O2-mediated oxidation of volatile pollutants.
Collapse
Affiliation(s)
- Emmanuel Arzoumanian
- Laboratoire des IMRCP, UMR CNRS 5623, Université Toulouse III (Paul Sabatier, UPS) , 118 route de Narbonne F-31062 Toulouse Cedex 9, France
| | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Bartusik D, Aebisher D, Lyons A, Greer A. Bacterial inactivation by a singlet oxygen bubbler: identifying factors controlling the toxicity of (1)O2 bubbles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:12098-12104. [PMID: 23075418 PMCID: PMC3812664 DOI: 10.1021/es303645n] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A microphotoreactor device was developed to generate bubbles (1.4 mm diameter, 90 μL) containing singlet oxygen at levels toxic to bacteria and fungus. As singlet oxygen decays rapidly to triplet oxygen, the bubbles leave behind no waste or byproducts other than O(2). From a comparative study in deaerated, air saturated, and oxygenated solutions, it was reasoned that the singlet oxygen bubbles inactivate Escherichia coli and Aspergillus fumigatus, mainly by an oxygen gradient inside and outside of the bubble such that singlet oxygen is solvated and diffuses through the aqueous solution until it reacts with the target organism. Thus, singlet oxygen bubble toxicity was inversely proportional to the amount of dissolved oxygen in solution. In a second mechanism, singlet oxygen interacts directly with E. coli that accumulate at the gas-liquid interface although this mechanism operates at a rate approximately 10 times slower. Due to encapsulation in the gaseous core of the bubble and a 0.98 ms lifetime, the bubbles can traverse relatively long 0.39 mm distances carrying (1)O(2) far into the solution; by comparison the diffusion distance of (1)O(2) fully solvated in H(2)O is much shorter (~150 nm). Bubbles that reached the outer air-water interface contained no (1)O(2). The mechanism by which (1)O(2) deactivated organisms was explored through the addition of detergent molecules and Ca(2+) ions. Results indicate that the preferential accumulation of E. coli at the air-water interface of the bubble leads to enhanced toxicity of bubbles containing (1)O(2). The singlet oxygen device offers intriguing possibilities for creating new types of disinfection strategies based on photodynamic ((1)O(2)) bubble carriers.
Collapse
Affiliation(s)
- Dorota Bartusik
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
| | - David Aebisher
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
| | - Alan Lyons
- Department of Chemistry, College of Staten Island, City University of New York, Staten Island, New York 10314, United States
| | - Alexander Greer
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
| |
Collapse
|
10
|
Bartusik D, Aebisher D, Ghosh G, Minnis M, Greer A. Fluorine end-capped optical fibers for photosensitizer release and singlet oxygen production. J Org Chem 2012; 77:4557-65. [PMID: 22546013 DOI: 10.1021/jo3006107] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The usefulness of a fiber optic technique for generating singlet oxygen and releasing the pheophorbide photosensitizer has been increased by the fluorination of the porous Vycor glass tip. Singlet oxygen emerges through the fiber tip with 669-nm light and oxygen, releasing the sensitizer molecules upon a [2 + 2] addition of singlet oxygen with the ethene spacer and scission of a dioxetane intermediate. Switching from a nonfluorinated to a fluorinated glass tip led to a clear reduction of the adsorbtive affinity of the departing sensitizer with improved release into homogeneous toluene solution and bovine tissue, but no difference was found in water since the sensitizer was insoluble. High surface coverage of the nonafluorohexylsilane enhanced the cleavage efficiency by 15% at the ethene site. The fluorosilane groups also caused crowding and seemed to reduce access of (1)O(2) to the ethene site, which attenuated the total quenching rate constant k(T), although there was less wasted (1)O(2) (from surface physical quenching) at the fluorosilane-coated than the native SiOH silica. The observations support a quenching mechanism that the replacement of the SiOH groups for the fluorosilane C-H and C-F groups enhanced the (1)O(2) lifetime at the fiber tip interface due to less efficient electronic-to-vibronic energy transfer.
Collapse
Affiliation(s)
- Dorota Bartusik
- Department of Chemistry and Graduate Center, City University of New York, Brooklyn College, Brooklyn, New York 11210, United States
| | | | | | | | | |
Collapse
|
11
|
Marin ML, Santos-Juanes L, Arques A, Amat AM, Miranda MA. Organic photocatalysts for the oxidation of pollutants and model compounds. Chem Rev 2011; 112:1710-50. [PMID: 22040166 DOI: 10.1021/cr2000543] [Citation(s) in RCA: 220] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- M Luisa Marin
- Instituto Universitario Mixto de Tecnología Química-Departamento de Química (UPV-CSIC), Avda. de los Naranjos s/n, E-46022, Valencia, Spain
| | | | | | | | | |
Collapse
|
12
|
Functionalization of rho-ZMOF with photosensitizers for singlet oxygen generation. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2011.04.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
13
|
Parvulescu VI, Garcia H. Photocatalysis in green chemistry and destruction of very toxic compounds. CATALYSIS 2011. [DOI: 10.1039/9781849732772-00204] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Vasile I. Parvulescu
- University of Bucharest Faculty of Chemistry, Department of Chemical Technology and Catalysis, Bd. Regina Elisabeta 4–12 030018 Bucharest Romania
| | - Hermenegildo Garcia
- Instituto de Tecnología Química CSIC-UPV Universidad Politécnica de Valencia, Av. De los Naranjos s/n 46022 Valencia Spain
| |
Collapse
|
14
|
Yin L, Niu J, Shen Z, Chen J. Mechanism of reductive decomposition of pentachlorophenol by Ti-doped beta-Bi(2)O(3) under visible light irradiation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:5581-5586. [PMID: 20583811 DOI: 10.1021/es101006s] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The reductive decomposition of pentachlorophenol (PCP) by photocatalysis with Ti-doped beta-Bi(2)O(3) was investigated under visible light (lambda > 420 nm) irradiation. The results indicated that hydroxyl radical (*OH) and singlet oxygen ((1)O(2)) could not be detected with electron spin resonance (ESR) on the photocatalyst under light irradiation. An electron scavenger weakened the photocatalytic activity of the photocatalyst for the decomposition of PCP; however, scavengers of reactive oxygen species (ROS) enhanced the activity. The decomposition intermediates of PCP detected by liquid chromatography-mass spectrometry (LC-MS) and gas chromatography-mass spectrometry (GC-MS) suggested the existence of phenol, cyclohexanone, cyclohexanol, glycol, and propylene. All the evidence suggested that reductive dechlorination was the major route in the decomposition of PCP, during which the photogenerated electron under visible light irradiation acted as reductant. The reliability of the proposed reductive mechanism was further verified by comparing the reduction potential (E(re)) of PCP with the conduction band potential (E(cb)) of the photocatalyst. The decomposition pathway of PCP with electron reduction under visible light irradiation was also investigated.
Collapse
Affiliation(s)
- Lifeng Yin
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | | | | | | |
Collapse
|
15
|
González-Béjar M, Montes-Navajas P, García H, Scaiano JC. Methylene blue encapsulation in cucurbit[7]uril: laser flash photolysis and near-IR luminescence studies of the interaction with oxygen. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:10490-4. [PMID: 19735127 DOI: 10.1021/la9011923] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The effect of methylene blue (MB) encapsulation in cucurbit[7]uril (CB[7]) on triplet excited-state behavior and singlet oxygen (1O2) generation has been studied by using laser flash photolysis (LFP) and time-resolved near-IR luminescence spectroscopy. The lifetime of the triplet excited state of MB is longer in the CB[7] cavity (140 micros for MB-CB[7] vs 79.5 micros for aqueous MB). Cucurbituril also protects the dye triplets from quenching by oxygen, reducing the quenching rate constant [kq(O2)] from 2.6x10(9) M(-1) s(-1) to 0.2x10(9) M(-1) s(-1). The quantum yield of 1O2 production in the air-equilibrated D2O solutions is similar for free MB and for MB-CB[7], and the singlet oxygen lifetime is approximately 70 micros, suggesting its decay occurs in the aqueous (D2O) phase. The generation of singlet oxygen is delayed by CB[7]; this is attributed to the time required for oxygen to access the CB[7] nanocavity and react with the MB triplet. Thus, the rate-limiting step for sensitization is the entry of oxygen into the CB[7] cavity. Encapsulation inside CB[7] increases the relative efficiency of photoinduced MB2+* dication-radical generation, for which a modest yield is observed.
Collapse
Affiliation(s)
- María González-Béjar
- Department of Chemistry, Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, Ontario, Canada, K1N 6N5
| | | | | | | |
Collapse
|
16
|
Lacombe S, Soumillion JP, El Kadib A, Pigot T, Blanc S, Brown R, Oliveros E, Cantau C, Saint-Cricq P. Solvent-free production of singlet oxygen at the gas-solid interface: visible light activated organic-inorganic hybrid microreactors including new cyanoaromatic photosensitizers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:11168-11179. [PMID: 19735158 DOI: 10.1021/la901504q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We synthesized new cyanoaromatics, benzo[b]triphenylene-9,14-dicarbonitrile (DBTP) 1a and a graftable derivative, 9,14-dicyanobenzo[b]triphenylene-3-carboxylic acid (DBTP-COOH) 1b, easily prepared from commercial reagents. Their photosensitizing properties were investigated. Hybrid porous silica monoliths loaded with encapsulated 1a or grafted 1b were prepared, and their adsorption, spectroscopic and photosensitizing properties, as well as stability, were compared. Solvent-free, efficient oxidation of dimethylsulfide (DMS) was observed at the gas-solid interface under visible light irradiation. Quantum yields of formation of 1O2 inside the porous monoliths are comparable to those of phenalenone. Singlet oxygen lifetimes (approximately 25 micros) were found to be longer in silica monoliths than in usual polar solvents such as methanol or ethanol. This new class of hybrid materials work as porous, transparent, and highly efficient microreactors for oxidation reactions under visible light.
Collapse
Affiliation(s)
- Sylvie Lacombe
- CNRS, Université de Pau, IPREM-UMR 5254, Helioparc, 2 rue du President Angot, BP 64053, Pau cedex 9, France.
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Martín R, Jiménez LB, Alvaro M, Scaiano JC, García H. Photoinduced formation and characterization of electron-hole pairs in azaxanthylium-derivatized short single-walled carbon nanotubes. Chemistry 2009; 15:8751-9. [PMID: 19603432 DOI: 10.1002/chem.200900372] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
2-Azaxanthone, a nitrogenated derivative of the well-studied organic chromophore xanthone, has been covalently bound through 2-(ethylthio)ethylamido linkers to the carboxylic acid groups of short, soluble single-walled carbon nanotubes (CNTs) of 450 nm average length, and the resulting azaxanthylium-functionalized CNTs (AZX-CNT, 8.5 wt % AZX content) characterized by solution (1)H NMR, Raman and IR spectroscopy and thermogravimetric analysis. Comparison of the quenching of the triplet excited state of AZX (steady-state and time-resolved) and of the transient optical spectra of CNTs and AZX-CNT shows that the covalent linkage boosts the interaction between the azaxanthylium moiety and the short CNT units. The triplet excited state of the azaxanthylium derivative is quenched by CNT with and without covalent bonding, but when it is covalently bonded, the singular transient spectrum is compatible with the photogeneration of electron holes through electron transfer from CNT to excited azaxanthylium units.
Collapse
Affiliation(s)
- Roberto Martín
- Instituto de Tecnología Química CSIC-UPV, Universidad Politécnica de Valencia, Av. De Los Naranjos s/n, 46022 Valencia, Spain
| | | | | | | | | |
Collapse
|
18
|
Maretti L, Carbonell E, Alvaro M, Scaiano J, Garcia H. Laser flash photolysis of dioxo iron phthalocyanine intercalated in hydrotalcite and its use as a photocatalyst. J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2009.04.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
19
|
Castillo A, Greer A. Theoretical studies of a singlet oxygen-releasing dioxapaddlane (1,4-diicosa naphthalene-1,4-endoperoxide). Struct Chem 2009; 20:399-407. [PMID: 22879733 PMCID: PMC3413292 DOI: 10.1007/s11224-009-9424-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Theoretical calculations have been used to examine singlet oxygen release from a naphthalene endoperoxide which bears a flexible (CH(2))(22) polymethylene "lid". Monte Carlo and ONIOM calculations that incorporated semi-empirical and density functional theory predicted the conformational influence of the polymethylene chain in the cycloreversion of dioxapaddlane, 1,4-diicosa naphthalene-1,4-endoperoxide, to (1)O(2) and 1,4-diicosa naphthalene. This study attempts to build a connection between (1)O(2) generation and "jump rope" dynamics of the dioxapaddlane. The polymethylene chain appears to function as a gatekeeper for the oxygen. Instead of coming full circle, a semi-circle rotation of the polymethylene bridge protected the peroxide group, limiting the dissociation of (1)O(2) from the naphthalene site.
Collapse
Affiliation(s)
- Alvaro Castillo
- Department of Chemistry and Graduate Center, Brooklyn College, The City University of New York (CUNY), Brooklyn, NY 11210, USA
| | - Alexander Greer
- Department of Chemistry and Graduate Center, Brooklyn College, The City University of New York (CUNY), Brooklyn, NY 11210, USA
| |
Collapse
|
20
|
Giaimuccio J, Zamadar M, Aebisher D, Meyer GJ, Greer A. Singlet oxygen chemistry in water. 2. Photoexcited sensitizer quenching by O2 at the water-porous glass interface. J Phys Chem B 2008; 112:15646-50. [PMID: 19368015 PMCID: PMC3336964 DOI: 10.1021/jp807556x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Insight into the O2 quenching mechanism of a photosensitizer (static or dynamic) would be useful for the design of heterogeneous systems to control the mode of generation of 1O2 in water. Here, we describe the use of a photosensitizer, meso-tetra(N-methyl-4-pyridyl)porphine (1), which was adsorbed onto porous Vycor glass (PVG). A maximum loading of 1.1 x 10(-6) mol 1 per g PVG was achieved. Less than 1% of the PVG surface was covered with photosensitizer 1, and the penetration of 1 reaches a depth of 0.32 mm along all faces of the glass. Time-resolved measurements showed that the lifetime of triplet 1*-ads was 57 microseconds in water. Triplet O2 quenched the transient absorption of triplet 1*-ads; for samples containing 0.9 x 10(-6)-0.9 x 10(-8) mol 1 adsorbed per g PVG, the Stern-Volmer constant, K(D), ranged from 23,700 to 32,100 M(-1). The adduct formation constant, Ks, ranged from 1310 to 510 M(-1). The amplitude of the absorption at 470 nm decreased slightly (by about 0.1) with increased O2 concentrations. Thus, the quenching behavior of triplet 1*-ads by O2 was proposed to be strongly dependent on dynamic quenching. Only approximately 10% of the quenching was attributed to the static quenching mechanism. The quenching of triplet 1*-ads was similar to that observed for photosensitizers in homogeneous solution which are often quenched dynamically by O2.
Collapse
Affiliation(s)
- Jovan Giaimuccio
- Department of Chemistry and Material Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218
| | - Matibur Zamadar
- Department of Chemistry and Graduate Center, City University of New York, Brooklyn College, Brooklyn, New York 11210
| | - David Aebisher
- Department of Chemistry and Graduate Center, City University of New York, Brooklyn College, Brooklyn, New York 11210
| | - Gerald J. Meyer
- Department of Chemistry and Material Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218
| | - Alexander Greer
- Department of Chemistry and Graduate Center, City University of New York, Brooklyn College, Brooklyn, New York 11210
| |
Collapse
|