1
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Didarataee S, Suprun A, Joshi N, Scaiano JC. NIR phosphorescence from decatungstate anions allows the conclusive characterization of its elusive excited triplet behaviour and kinetics. Chem Commun (Camb) 2024. [PMID: 38258882 DOI: 10.1039/d3cc06282a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
The characterization of the triplet state of decatungstate (3DT*) and its NIR phosphorescence with lifetimes ∼100 ns in acetonitrile allow the easy determination of rate constants that are key to understanding its role in catalysis. The absence of oxygen quenching can now be understood as the excitation energy of 3DT* is lower than the energy of singlet oxygen.
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Affiliation(s)
- Saba Didarataee
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada.
| | - Anastasiia Suprun
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada.
| | - Neeraj Joshi
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada.
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada.
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2
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Didarataee S, Joshi N, Scaiano JC. A laser flash photolysis study of the free radical chemistry of lipoic acid and dihydrolipoic acid. Photochem Photobiol Sci 2023; 22:2579-2585. [PMID: 37740885 DOI: 10.1007/s43630-023-00473-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 08/28/2023] [Indexed: 09/25/2023]
Abstract
The free radical chemistry of lipoic acid (LA) and dihydrolipoic acid (DHLA) intersect at the point where DHLA loses hydrogen to a good hydrogen abstracting radical, while LA reacts with strongly reducing ketyl radicals capable of donating a hydrogen atom. While aliphatic thiyl radicals have an absorbance at ~ 330 nm, the resulting radical, formally also a thiyl radical has distinct spectroscopic properties with a maximum at 385 nm, suggesting that the two sulphur centres interact strongly with each other as part of the chromophore. The reactions that form these radicals were studied by laser flash photolysis that revealed DHLA as an excellent hydrogen donor, while LA is an excellent hydrogen acceptor. The results support earlier evidence that the real antioxidant is DHLA, while LA is not; yet, the reported facile interconversion of the two molecules suggests that LA may be a better supplement, given its shelf stability, compared with a far more difficult-to-handle DHLA.
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Affiliation(s)
- Saba Didarataee
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Neeraj Joshi
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
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3
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Scaiano JC. A beginners guide to understanding the mechanisms of photochemical reactions: things you should know if light is one of your reagents. Chem Soc Rev 2023; 52:6330-6343. [PMID: 37606534 DOI: 10.1039/d3cs00453h] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
The increasing popularity of applied photochemistry has changed the composition of the practitioners of photochemistry, from traditional specialists, to users whose expertise lies elsewhere, yet they find light as a useful and powerful reagent. I introduce Kasha's rule very early in this tutorial; this unconventional approach allows me to bypass information about high electronic states in favor of the lowest singlet and triplet excited states. Doing this I try to provide a fast entry enabling newcomers in the field of applied photochemistry to have a taste of what the field has to offer, in the hope that they will like what they see, and venture further into the many resources available to go deeper into the fascinating field of organic photochemistry.
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Affiliation(s)
- Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1G 5N5, Canada.
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4
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Cely-Pinto M, Wang B, Scaiano JC. Photocatalytic Semi-Hydrogenation of Alkynes: A Game of Kinetics, Selectivity and Critical Timing. Nanomaterials (Basel) 2023; 13:2390. [PMID: 37686898 PMCID: PMC10490202 DOI: 10.3390/nano13172390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 08/12/2023] [Accepted: 08/18/2023] [Indexed: 09/10/2023]
Abstract
The semi-hydrogenation reaction of alkynes is important in the fine chemicals and pharmaceutical industries, and it is thus important to find catalytic processes that will drive the reaction efficiently and at a low cost. The real challenge is to drive the alkyne-to-alkene reaction while avoiding over-hydrogenation to the saturated alkane moiety. The problem is more difficult when dealing with aromatic substitution at the alkyne center. Simple photocatalysts based on Palladium tend to proceed to the alkane, and stopping at the alkene with good selectivity requires very precise timing with basically no timing tolerance. We report here that the goal of high conversion with high selectivity could be achieved with TiO2-supported copper (Cu@TiO2), although with slower kinetics than for Pd@TiO2. A novel bimetallic catalyst, namely, CuPd@TiO2 (0.8% Cu and 0.05% Pd), with methanol as the hydrogen source could improve the kinetics by 50% with respect to Cu@TiO2, while achieving selectivities over 95% and with exceptional timing tolerance. Further, the low Palladium content minimizes its use, as Palladium is regarded as an element at risk of depletion.
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Affiliation(s)
| | | | - Juan C. Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada; (M.C.-P.); (B.W.)
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5
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Scaiano JC, Wang B, Bourgonje CR, Yaghmaei M. The nitro to amine reduction: from millions of tons to single molecule studies. PURE APPL CHEM 2023; 95:913-920. [PMID: 38013690 PMCID: PMC10505479 DOI: 10.1515/pac-2023-0111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Palladium nanostructures are interesting heterogeneous catalysts because of their high catalytic activity in a vast range of highly relevant reactions such as cross couplings, dehalogenations, and nitro-to-amine reductions. In the latter case, the catalyst Pd@GW (palladium on glass wool) shows exceptional performance and durability in reducing nitrobenzene to aniline under ambient conditions in aqueous solutions. To enhance our understanding, we use a combination of optical and electron microscopy, in-flow single molecule fluorescence, and bench chemistry combined with a fluorogenic system to develop an intimate understanding of Pd@GW in nitro-to-amine reductions. We fully characterize our catalyst in situ using advanced microscopy techniques, providing deep insights into its catalytic performance. We also explore Pd cluster migration on the surface of the support under flow conditions, providing insights into the mechanism of catalysis. We show that even under flow, Pd migration from anchoring sites seems to be minimal over 4 h, with the catalyst stability assisted by APTES anchoring.
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Affiliation(s)
- Juan C. Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ONK1N 6N5, Canada
| | - Bowen Wang
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ONK1N 6N5, Canada
| | - Connor R. Bourgonje
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ONK1N 6N5, Canada
| | - Mahzad Yaghmaei
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ONK1N 6N5, Canada
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6
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da Silva DC, Mapukata S, Currie S, Kitos AA, Lanterna AE, Nyokong T, Scaiano JC. Fibrous TiO 2 Alternatives for Semiconductor-Based Catalysts for Photocatalytic Water Remediation Involving Organic Contaminants. ACS Omega 2023; 8:21585-21593. [PMID: 37360451 PMCID: PMC10286280 DOI: 10.1021/acsomega.3c00781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 05/25/2023] [Indexed: 06/28/2023]
Abstract
Water decontamination remains a challenge in several developed and developing countries. Affordable and efficient approaches are needed urgently. In this scenario, heterogeneous photocatalysts appear as one of the most promising alternatives. This justifies the extensive attention that semiconductors, such as TiO2, have gained over the last decades. Several studies have evaluated their efficiency for environmental applications; however, most of these tests rely on the use of powder materials that have minimal to no applicability for large-scale applications. In this work, we investigated three fibrous TiO2 photocatalysts, TiO2 nanofibers (TNF), TiO2 on glass wool (TGW), and TiO2 in glass fiber filters (TGF). All materials have macroscopic structures that can be easily separated from solutions or that can work as fixed beds under flow conditions. We evaluated and compared their ability to bleach a surrogate dye molecule, crocin, under batch and flow conditions. Using black light (UVA/visible), our catalysts were able to bleach a minimum of 80% of the dye in batch experiments. Under continuous flow experiments, all catalysts could decrease dye absorption under shorter irradiation times: TGF, TNF, and TGW could, respectively, bleach 15, 18, and 43% of the dye with irradiation times as short as 35 s. Catalyst comparison was based on the selection of physical and chemical criteria relevant for application on water remediation. Their relative performance was ranked and applied in a radar plot. The features evaluated here had two distinct groups, chemical performance, which related to the dye degradation, and mechanical properties, which described their applicability in different systems. This comparative analysis gives insights into the selection of the right flow-compatible photocatalyst for water remediation.
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Affiliation(s)
- Daliane
R. C. da Silva
- Department
of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Sivuyisiwe Mapukata
- Institute
for Nanotechnology Innovation, Rhodes University, Grahamstown 6140, South Africa
| | - Sara Currie
- Department
of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Alexandros A. Kitos
- Department
of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Anabel E. Lanterna
- Department
of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Tebello Nyokong
- Institute
for Nanotechnology Innovation, Rhodes University, Grahamstown 6140, South Africa
| | - Juan C. Scaiano
- Department
of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
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7
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Bourgonje CR, da Silva DRC, McIlroy E, Calvert ND, Shuhendler AJ, Scaiano JC. Silver nanoparticles with exceptional near-infrared absorbance for photoenhanced antimicrobial applications. J Mater Chem B 2023. [PMID: 37338380 DOI: 10.1039/d3tb00199g] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2023]
Abstract
In this work, we outline a simple method for synthesizing decahedral and triangular silver nanoparticles using light to tune particle shape and spectral characteristics. Notably, we were able to generate triangular silver nanoparticles with exceptional absorbance in the near-infrared (NIR) region, with high spectral overlap with the biological window, making them particularly promising for biological applications. We further demonstrate that under complementary LED illumination, these excitable plasmonic particles display exceptional antibacterial properties, several orders of magnitude more potent than similar particles under dark conditions or under illumination that does not match particle absorbance. This work demonstrates the powerful effects that LED lights can have on the antibacterial activity of AgNPs, providing an inexpensive and easily implemented route to unlocking the full potential of AgNPs in photobiological applications.
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Affiliation(s)
- Connor R Bourgonje
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
| | - Daliane R C da Silva
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
| | - Ella McIlroy
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
| | - Nicholas D Calvert
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
| | - Adam J Shuhendler
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
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8
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Yaghmaei M, Bourgonje CR, Scaiano JC. Facile Scale-Up of the Flow Synthesis of Silver Nanostructures Based on Norrish Type I Photoinitiators. Molecules 2023; 28:molecules28114445. [PMID: 37298921 DOI: 10.3390/molecules28114445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 05/27/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023] Open
Abstract
Silver nanoparticles have become one of the most commercially and industrially relevant nanomaterials of the 21st century, owing to their potent antibacterial properties, as well as their useful catalytic and optical properties. Although many methods have been explored to produce AgNPs, we favor the photochemical approach using photoinitiators to produce AgNPs, owing to the high degree of control over reaction conditions, and the generation of so-called AgNP 'seeds' that can be used as-is, or as precursors for other silver nanostructures. In this work, we explore the scale-up of AgNP synthesis using flow chemistry and assess the usefulness of a range of industrial Norrish Type 1 photoinitiators in terms of flow compatibility and reaction time, as well as the resulting plasmonic absorption and morphologies. We establish that while all the photoinitiators used were able to generate AgNPs in a mixed aqueous/alcohol system, photoinitiators that generate ketyl radicals showed the greatest promise in terms of reaction times, while also showing greater flow compatibility compared to photoinitiators that generate 𝛼-aminoalkyl and α-hydroxybenzyl radicals. These findings help to establish a guideline for adapting photochemical AgNP syntheses to flow systems, helping to improve the scalability of the method in one of the largest industries in nanomaterial chemistry.
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Affiliation(s)
- Mahzad Yaghmaei
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada
| | - Connor R Bourgonje
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada
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9
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Yaghmaei M, Scaiano JC. A simple Norrish Type II actinometer for flow photoreactions. Photochem Photobiol Sci 2023:10.1007/s43630-023-00417-1. [PMID: 37069424 DOI: 10.1007/s43630-023-00417-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 04/03/2023] [Indexed: 04/19/2023]
Abstract
This contribution addresses a frequent problem in flow photochemistry, where methodologies to determine the quantum efficiency of photoreactions are totally lacking. In spite of numerous studies being available in the literature, product reaction yields are never accompanied by measurements to determine their quantum yields. Basically, the key reagent in the reaction, light, is not measured under the experimental conditions of exposure. We report here a flow actinometer based on the photochemistry of valerophenone that can be readily implemented in the organic laboratory for irradiations in the UV region. For example for UVB lamps used in our work, the irradiance was measured as 1.1 × 10-4 einstein l-1 s-1. Our photoreactor design involves wrapping low-pressure lamps with Teflon tubbing, where the photochemistry takes place. Similar strategies could be implemented with other geometries or with lamps (e.g. LED) and actinometers with sensitivity in other spectral regions.
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Affiliation(s)
- Mahzad Yaghmaei
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON, K1N 6N5, Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON, K1N 6N5, Canada.
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10
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Hainer A, Joshi N, Scaiano JC. Laser flash photolysis of titanium dioxide suspensions for the evaluation of solvent-mediated radical reactions. Phys Chem Chem Phys 2023; 25:2747-2751. [PMID: 36625327 DOI: 10.1039/d2cp05170b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The chemistry originating from the scavenging of the highly electrophilic hole in TiO2 can be readily monitored using laser flash photolysis techniques. Dilute suspensions are sufficiently transparent in the UV region that long lived signals from reactions of solvent radicals with 1,1-diphenylethylene can be readily monitored. Transient signals originating from hole, electron and trapped radicals are extremely long lived showing stretched exponentials (nanoseconds to milliseconds), adequately described by fractal models.
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Affiliation(s)
- Andrew Hainer
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON K1N 6N5, Canada.
| | - Neeraj Joshi
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON K1N 6N5, Canada.
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON K1N 6N5, Canada.
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11
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Cely-Pinto M, Wang B, Scaiano JC. Understanding α-lipoic acid photochemistry helps to control the synthesis of plasmonic gold nanostructures. Photochem Photobiol Sci 2023:10.1007/s43630-023-00378-5. [PMID: 36702995 DOI: 10.1007/s43630-023-00378-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 01/17/2023] [Indexed: 01/27/2023]
Abstract
We propose the photopolymerization of lipoic acid (LA) as an novel approach to produce a cross-linked polymeric matrix of lipoic acid monomers (PALA) which helps to control the size of plasmonic gold nanostructures when using 3,3,6,8-tetramethyl-1-tetralone as the photo-initiator for the reduction of Au(III) to Au0. A complete characterization of the polymer is included, and the dual behaviour of LA as an in situ stabilizer and reducing agent is investigated. These findings are relevant to the understanding of the photochemical transformation of this biologically relevant compound and would benefit the increasing use of LA and PALA for the synthesis of various nanomaterials.
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Affiliation(s)
- Melissa Cely-Pinto
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON, K1N 6N5, Canada
| | - Bowen Wang
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON, K1N 6N5, Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON, K1N 6N5, Canada.
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12
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Scaiano JC, Wang B, Bourgonje CR. Fiber-glass supported catalysis. Real-time, high-resolution visualization of active Palladium catalytic centers during the reduction of nitro compounds. Catal Sci Technol 2023. [DOI: 10.1039/d2cy01857h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The development of new flow-compatible high-performance catalysts requires the understanding of the activity of the material in the nanometric scale. Here we use a combination of fluorescence and electron microscopy,...
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13
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da Silva DRC, Scaiano JC. Exploring the Antibacterial Properties of Lignin-coated Magnetic Nanoparticles Synthesized in a One-pot Process. Photochem Photobiol 2022; 99:706-715. [PMID: 35929341 DOI: 10.1111/php.13686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 07/29/2022] [Indexed: 12/01/2022]
Abstract
Given the current grave problems with antibiotic resistance, the discovery of novel, unconventional antibacterial drugs are not just important, but also urgent. In this contribution, we report on the synthesis and testing of several composite nanomaterials that may find applications as therapeutic drugs or surface disinfectants. These materials are based on magnetic nanostructures coated with lignin, for example, lignin@FeCo. The magnetic properties of these nanocomposites facilitate removal or localization, while the lignin shell provides biocompatibility. These nanomaterials are mild antibacterials in the absence of light, but when illuminated become powerful antibacterial agents with typically ≥6 log units bacterial reduction in 1 to 5 minutes of irradiation. These materials are strongly absorbing, including in the very useful NIR biological window, which we illustrate using 810 nm LED irradiation. We also show that in the short time required for antibacterial action, thermal changes are very small (≤5°C). Further, biocompatibility tests using fibroblasts show very limited cell damage and no enhanced adverse effect during 810 nm NIR illumination. As a surface coating for the active material, lignin provides a "trojan horse" strategy to facilitate the antibacterial action.
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Affiliation(s)
- Daliane R C da Silva
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON, K1N 6N5, Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, ON, K1N 6N5, Canada
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14
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Sindelo A, Britton J, Lanterna AE, Scaiano JC, Nyokong T. Decoration of glass wool with zinc (II) phthalocyanine for the photocatalytic transformation of methyl orange. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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15
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Yaghmaei M, Lanterna AE, Scaiano JC. Nitro to amine reductions using aqueous flow catalysis under ambient conditions. iScience 2021; 24:103472. [PMID: 34950857 PMCID: PMC8671935 DOI: 10.1016/j.isci.2021.103472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 10/09/2021] [Accepted: 11/12/2021] [Indexed: 12/02/2022] Open
Abstract
A catalyst based on Pd on glass wool (Pd@GW) shows exceptional performance and durability for the reduction of nitrobenzene to aniline at room temperature and ambient pressure in aqueous solutions. The reaction is performed in a flow system and completed with 100% conversion under a variety of flow rates, 2 to 100 mLmin−1 (normal laboratory fast flow conditions). Sodium borohydride or dihydrogen perform well as reducing agents. Scale-up of the reaction to flows of 100 mLmin−1 also shows high conversions and robust catalytic performance. Catalyst deactivation can be readily corrected by flowing a NaBH4 solution. The catalytic system proves to be generally efficient, performing well with a range of nitroaromatic compounds. The shelf life of the catalyst is excellent and its reusability after 6-8 months of storage showed the same performance as for the fresh catalyst. Palladium on glass wool catalyzes reduction of nitrobenzene to aniline Catalytic flow process at atmospheric temperature and pressure in aqueous media Facile catalyst synthesis using inexpensive glass wool and low palladium loading Sustainable chemical process using sodium borohydride or hydrogen gas
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Affiliation(s)
- Mahzad Yaghmaei
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON K1N 6N5, Canada
| | - Anabel E Lanterna
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON K1N 6N5, Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON K1N 6N5, Canada
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16
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Mejía-Giraldo JC, Scaiano JC, Gallardo-Cabrera C, Puertas-Mejía MA. Photoprotection and Photostability of a New Lignin-Gelatin- Baccharis antioquensis-Based Hybrid Biomaterial. Antioxidants (Basel) 2021; 10:1904. [PMID: 34943007 PMCID: PMC8750119 DOI: 10.3390/antiox10121904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 11/05/2021] [Accepted: 11/06/2021] [Indexed: 12/02/2022] Open
Abstract
The aim of this study was to develop a new hybrid biomaterial that could photo-stabilize and improve the photoprotective capacity of a Baccharis antioquensis extract. Different combinations of lignin/gelatin/natural extract were applied to prepare hybrid biomaterial nanoparticles (NPs), which were then incorporated into an emulsion. The in vitro photoprotection and photostability were evaluated. The methanolic extract showed high phenolic content (646.4 ± 9.5 mg GAE/g dry extract) and a DPPH radical assay revealed that the antiradical capacity of the extract (0.13 to 0.05 g extract/mmol DPPH) was even better than that of BHT. The particle size of the hybrid biomaterial ranged from 100 to 255 nm; a polydispersity index (PdI) between 0.416 and 0.788 is suitable for topical use in dermocosmetic products. The loading capacity of the extract ranged from 27.0 to 44.5%, and the nanoparticles (NPs) showed electrostatic stability in accordance with the zeta potential value. We found that the formulation based on lignin: extract (1:1 ratio) and gelatin: lignin: extract (0.5:0.5:1 ratio) demonstrated photoprotection qualities with a sun protection factor (SPF) ranging from 9.4 to 22.6. In addition, all the hybrid NP-formulations were time-stable with %SPFeff and %UVAPFeff greater than 80% after exposure to 2 h of radiation. These results suggest that the hybrid biopolymer-natural extract improved the photoprotection and photostability properties, as well as the antiradical capacity, of the B. antioquensis extract, and may be useful for trapping high polyphenol content from natural extracts, with potential application in cosmeceutical formulations.
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Affiliation(s)
- Juan C. Mejía-Giraldo
- Grupo de Investigación en Compuestos Funcionales, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, Colombia;
- Grupo de Estabilidad de Medicamentos, Cosméticos y Alimentos, Facultad de Ciencias Farmacéuticas y Alimentarias, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, Colombia;
| | - Juan C. Scaiano
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5, Canada;
| | - Cecilia Gallardo-Cabrera
- Grupo de Estabilidad de Medicamentos, Cosméticos y Alimentos, Facultad de Ciencias Farmacéuticas y Alimentarias, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, Colombia;
| | - Miguel A. Puertas-Mejía
- Grupo de Investigación en Compuestos Funcionales, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, Colombia;
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17
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Gawargy TA, Wang B, Scaiano JC. Unveiling the Mechanism for the Photochemistry and Photodegradation of Vanillin. Photochem Photobiol 2021; 98:429-433. [PMID: 34570372 DOI: 10.1111/php.13520] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 09/14/2021] [Indexed: 12/01/2022]
Abstract
The photolysis of vanillin produces a short-lived triplet state where its lifetime is controlled by efficient self-quenching (kSQ ~ 2 × 109 m-1 s-1 ) which also generates radicals. Free radical reactions, including vanillin dimer formation, are responsible for the degradation of vanillin and is accompanied by yellowing of the acetonitrile solutions. Laser flash photolysis studies reveal a triplet absorbing at 390 nm, readily quenched by naphthalenes, conjugated dienes and oxygen. Vanillin is also a good singlet oxygen sensitizer as revealed by its characteristic NIR emission at 1270 nm.
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Affiliation(s)
- Teresa A Gawargy
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON, Canada
| | - Bowen Wang
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON, Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON, Canada
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18
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Fournier K, Marina N, Joshi N, Berthiaume VR, Currie S, Lanterna AE, Scaiano JC. Scale-up of a photochemical flow reactor for the production of lignin-coated titanium dioxide as a sunscreen ingredient. Journal of Photochemistry and Photobiology 2021. [DOI: 10.1016/j.jpap.2021.100040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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19
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Affiliation(s)
- Bowen Wang
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research, University of Ottawa, Ottawa K1N 6N5, Ontario, Canada
| | - Anabel E. Lanterna
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research, University of Ottawa, Ottawa K1N 6N5, Ontario, Canada
| | - Juan C. Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research, University of Ottawa, Ottawa K1N 6N5, Ontario, Canada
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20
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Lemir ID, Argüello JE, Lanterna AE, Scaiano JC. Heterogeneous photocatalysis of azides: extending nitrene photochemistry to longer wavelengths. Chem Commun (Camb) 2020; 56:10239-10242. [PMID: 32756616 DOI: 10.1039/d0cc04118a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The photodecomposition of azides to generate nitrenes usually requires wavelengths in the <300 nm region. In this study, we show that this reaction can be readily performed in the UVA region (368 nm) when catalyzed by Pd-decorated TiO2. In aqueous medium the reaction leads to amines, with water acting as the H source; however, in non-protic and non-nucleophilic media, such as acetonitrile, nitrenes recombine to yield azo compounds, while azirine-mediated trapping occurs in the presence of nucleophiles. The heterogeneous process facilitates catalyst separation while showing great chemoselectivity and high yields.
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Affiliation(s)
- Ignacio D Lemir
- Department of Chemistry and Biomolecular Science and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, ON K1N 6N5, Canada. and INFIQC-CONICET-UNC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina
| | - Juan E Argüello
- INFIQC-CONICET-UNC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina
| | - Anabel E Lanterna
- Department of Chemistry and Biomolecular Science and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, ON K1N 6N5, Canada.
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Science and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, ON K1N 6N5, Canada.
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21
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Gawargy TA, Costa P, Lanterna AE, Scaiano JC. Photochemical benzylic radical arylation promoted by supported Pd nanostructures. Org Biomol Chem 2020; 18:6047-6052. [PMID: 32705111 DOI: 10.1039/d0ob01227k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a novel way to promote photochemical benzylic radical arylations using Pd nanostructures. Traditional benzylic radical reaction pathways are challenged by the presence of metal centres that provoke unprecedented regioselectivity towards more synthetically relevant C(sp3)-C(sp2) couplings. This new C-H activation pathway is rationalised by means of a pseudo-persistent radical effect facilitated by metal centres. We show the mechanistic and computational aspects of the heterogeneous photocatalytic processes that are the root of this drastic change in reactivity.
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Affiliation(s)
- Teresa A Gawargy
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada.
| | - Paolo Costa
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada.
| | - Anabel E Lanterna
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada.
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada.
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22
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Mapukata S, Hainer AS, Lanterna AE, Scaiano JC, Nyokong T. Decorated titania fibers as photocatalysts for hydrogen generation and organic matter degradation. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112185] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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23
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Teixeira RI, de Lucas NC, Garden SJ, Lanterna AE, Scaiano JC. Glass wool supported ruthenium complexes: versatile, recyclable heterogeneous photoredox catalysts. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02479d] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Versatile and recyclable heterogeneous photocatalysts based on the use of glass wool supported ruthenium complexes and organic dyes.
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Affiliation(s)
- Rodolfo I. Teixeira
- Department of Chemistry and Biomolecular Science and Centre for Advanced Materials Research (CAMaR)
- University of Ottawa
- Ottawa
- Canada
- Instituto de Química
| | - Nanci C. de Lucas
- Instituto de Química
- Universidade Federal do Rio de Janeiro
- Rio de Janeiro
- Brazil
| | - Simon J. Garden
- Instituto de Química
- Universidade Federal do Rio de Janeiro
- Rio de Janeiro
- Brazil
| | - Anabel E. Lanterna
- Department of Chemistry and Biomolecular Science and Centre for Advanced Materials Research (CAMaR)
- University of Ottawa
- Ottawa
- Canada
| | - Juan C. Scaiano
- Department of Chemistry and Biomolecular Science and Centre for Advanced Materials Research (CAMaR)
- University of Ottawa
- Ottawa
- Canada
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24
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Abstract
Upon UVA irradiation, aryl halides can undergo dehalogenation in the presence of bases and methanol as a hydrogen donor. This catalyst-free photochemical dehalogenation is furnished through a facile radical chain reaction under mild conditions. The chain reaction follows UVA irradiation of the reaction mixture in a transition-metal-free environment. Mechanistic studies support a chain mechanism in which initiation involves absorption by a methoxide-bromoarene complex facilitated by halogen-bonding interactions. The methoxide-bromine interaction leads to a weakened Br-C bond that is prone to facile cleavage during the initiation and propagation steps.
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Affiliation(s)
- Ayda Elhage
- Department of Chemistry and Biomolecular Science, Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada
| | - Paolo Costa
- Department of Chemistry and Biomolecular Science, Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada
| | - Amrah Nasim
- Department of Chemistry and Biomolecular Science, Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada
| | - Anabel E Lanterna
- Department of Chemistry and Biomolecular Science, Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Science, Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada
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25
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Estrada-Flórez SE, Moncada FS, Lanterna AE, Sierra CA, Scaiano JC. Spectroscopic and Time-Dependent DFT Study of the Photophysical Properties of Substituted 1,4-Distyrylbenzenes. J Phys Chem A 2019; 123:6496-6505. [PMID: 31288515 DOI: 10.1021/acs.jpca.9b04492] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this contribution, we examine the photophysical properties of 15 totally trans-trans 1,4-distyrylbenzene derivatives (DSBs) functionalized with different electron-donating (ED) and electron-withdrawing (EW) groups by experimental and computational methodologies. We use UV-vis and fluorescence spectroscopies to determine the experimental optical properties such as the maximum absorption (λabsexp) and emission (λemexp) wavelengths, the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) energy gaps (ΔEabsexp), the molar extinction coefficients (ε), the fluorescence quantum yields (Φf), and the fluorescence lifetimes (τ). We also calculate the experimental spontaneous emission decay rate (krexp) and correlate all of these magnitudes to the corresponding calculated properties, maximum absorption (λabscal) and emission (λemcal) wavelengths, vertical transition energies (ΔEabscal), oscillator strength (Fosc), and spontaneous emission decay rate (krcal), obtained by the time-dependent density functional theory method. We analyze the effect of the electronic nature of the substituents on the properties of the DSBs, finding that the ED and EW groups lead to bathochromic shifts. This is consistent with the decrease of ΔE values as the strength of ED and EW substituents increases. We find excellent correlations between calculated and experimental values for λabs, λem, and ΔEabs (r ∼ 0.99-0.95). Additionally, the correlations between the relative ε with Fosc values and the kr values are in good agreement (r ∼ 0.88-0.72) with the experimental properties. Overall, we find that for substituted 1,4-DSBs, computational chemistry is an excellent tool to predict structure-property relationships, which can be useful to forecast the properties of their polymeric analogues, which are usually difficult to determine experimentally.
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Affiliation(s)
- Sandra E Estrada-Flórez
- Grupo de Investigación en Macromoléculas, Departamento de Química , Universidad Nacional de Colombia , Bogotá 111321 , Colombia
| | - Félix S Moncada
- Grupo de Investigación en Macromoléculas, Departamento de Química , Universidad Nacional de Colombia , Bogotá 111321 , Colombia.,Programa de Química , Universidad de la Amazonia , Calle 17 Diagonal 17 - Carrera 3F , Florencia 180001 , Colombia
| | - Anabel E Lanterna
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , Ontario K1N 6N5 , Canada
| | - Cesar A Sierra
- Grupo de Investigación en Macromoléculas, Departamento de Química , Universidad Nacional de Colombia , Bogotá 111321 , Colombia
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , Ontario K1N 6N5 , Canada
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26
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Abstract
Abstract
In the new millennium the well-established paradigms of organic photochemistry have come alive as the basis for a wide range of synthetic methodologies that take advantage of the enhanced redox properties of excited states. While many strategies have been developed using rare, expensive and non-reusable catalysts, the road forward should include catalysts based on more abundant elements and reusable materials. This green road leads to the exploration of heterogeneous systems that can be eventually adapted for flow photocatalysis, and also adopted for the solution of environmental problems such as water treatment and fuel generation using solar radiation. If heterogeneous photocatalysis can play a role in supplying solutions to drug synthesis, energy and potable water supplies, then photochemistry will have an unprecedented societal impact.
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Affiliation(s)
- Juan C. Scaiano
- Department of Chemistry and Biomolecular Science, Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie, Ottawa , ON K1N 6N5 , Canada
| | - Anabel E. Lanterna
- Department of Chemistry and Biomolecular Science, Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie, Ottawa , ON K1N 6N5 , Canada
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27
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Hainer A, Marina N, Rincon S, Costa P, Lanterna AE, Scaiano JC. Highly Electrophilic Titania Hole as a Versatile and Efficient Photochemical Free Radical Source. J Am Chem Soc 2019; 141:4531-4535. [PMID: 30830774 DOI: 10.1021/jacs.8b13422] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Photogenerated holes in nanometric semiconductors, such as TiO2, constitute remarkable powerful electrophilic centers, capable of capturing an electron from numerous donors such as ethers, or nonactivated substrates like toluene or acetonitrile, and constitute an exceptionally clean and efficient source of free radicals. In contrast with typical free radical precursors, semiconductors generate single radicals (rather than pairs), where the precursors can be readily removed by filtration or centrifugation after use, thus making it a convenient tool in organic chemistry. The process can be described as an example of dystonic proton coupled electron transfer.
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Affiliation(s)
- Andrew Hainer
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR) , University of Ottawa , Ottawa K1N 6N5 , Canada
| | - Nancy Marina
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR) , University of Ottawa , Ottawa K1N 6N5 , Canada
| | - Stefanie Rincon
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR) , University of Ottawa , Ottawa K1N 6N5 , Canada
| | - Paolo Costa
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR) , University of Ottawa , Ottawa K1N 6N5 , Canada
| | - Anabel E Lanterna
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR) , University of Ottawa , Ottawa K1N 6N5 , Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR) , University of Ottawa , Ottawa K1N 6N5 , Canada
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28
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Elhage A, Lanterna AE, Scaiano JC. Catalytic farming: reaction rotation extends catalyst performance. Chem Sci 2019; 10:1419-1425. [PMID: 30809358 PMCID: PMC6354835 DOI: 10.1039/c8sc04188a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 11/14/2018] [Indexed: 12/20/2022] Open
Abstract
The use of heterogeneous catalysis has key advantages compared to its homogeneous counterpart, such as easy catalyst separation and reusability. However, one of the main challenges is to ensure good performance after the first catalytic cycles. Active catalytic species can be inactivated during the catalytic process leading to reduced catalytic efficiency, and with that loss of the advantages of heterogeneous catalysis. Here we present an innovative approach in order to extend the catalyst lifetime based on the crop rotation system used in agriculture. The catalyst of choice to illustrate this strategy, Pd@TiO2, is used in alternating different catalytic reactions, which reactivate the catalyst surface, thus extending the reusability of the material, and preserving its selectivity and efficiency. As a proof of concept, different organic reactions were selected and catalyzed by the same catalytic material during target molecule rotation.
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Affiliation(s)
- Ayda Elhage
- Department of Chemistry and Biomolecular Sciences , Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , Ontario K1N 6N5 , Canada . ;
| | - Anabel E Lanterna
- Department of Chemistry and Biomolecular Sciences , Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , Ontario K1N 6N5 , Canada . ;
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences , Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , Ontario K1N 6N5 , Canada . ;
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29
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Scaiano JC, Braslavsky SE, Borsarelli CD. Editorial. Photochem Photobiol 2018; 94:1085. [PMID: 30421799 DOI: 10.1111/php.13036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Silvia E Braslavsky
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany
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30
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McTiernan CD, Leblanc X, Scaiano JC. Retraction of “Heterogeneous Titania-Photoredox/Nickel Dual Catalysis: Decarboxylative Cross-Coupling of Carboxylic Acids with Aryl Iodides”. ACS Catal 2018. [DOI: 10.1021/acscatal.8b03510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Bard A, Rondon R, Marquez DT, Lanterna AE, Scaiano JC. How Fast Can Thiols Bind to the Gold Nanoparticle Surface? Photochem Photobiol 2018; 94:1109-1115. [PMID: 30192996 DOI: 10.1111/php.13010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 08/24/2018] [Indexed: 11/27/2022]
Abstract
Kinetics of gold nanoparticle surface modification with thiols can take more than one hour for completion. 7-mercapto-4-methylcoumarin can be used to follow the process by fluorescence spectroscopy and serves as a convenient molecular probe to determine relative kinetics. SERS studies with aromatic thiols further support the slow surface modification kinetics observed by fluorescence spectroscopy. The formation of thiolate bonds is a relatively slow process; we recommend one to two hour wait for thiol binding to be essentially complete, while for disulfides, overnight incubation is suggested.
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Affiliation(s)
- Amanda Bard
- Department of Chemistry and Biomolecular Sciences, Centre for Advanced Materials Research (CAMaR), University of Ottawa, Ottawa, ON, Canada
| | - Rebeca Rondon
- Department of Chemistry and Biomolecular Sciences, Centre for Advanced Materials Research (CAMaR), University of Ottawa, Ottawa, ON, Canada
| | - Daniela T Marquez
- Department of Chemistry and Biomolecular Sciences, Centre for Advanced Materials Research (CAMaR), University of Ottawa, Ottawa, ON, Canada
| | - Anabel E Lanterna
- Department of Chemistry and Biomolecular Sciences, Centre for Advanced Materials Research (CAMaR), University of Ottawa, Ottawa, ON, Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences, Centre for Advanced Materials Research (CAMaR), University of Ottawa, Ottawa, ON, Canada
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32
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Elhage A, Wang B, Marina N, Marin ML, Cruz M, Lanterna AE, Scaiano JC. Glass wool: a novel support for heterogeneous catalysis. Chem Sci 2018; 9:6844-6852. [PMID: 30310617 PMCID: PMC6114997 DOI: 10.1039/c8sc02115e] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 07/10/2018] [Indexed: 11/21/2022] Open
Abstract
Heterogeneous catalysis presents significant advantages over homogeneous catalysis such as ease of separation and reuse of the catalyst. Here we show that a very inexpensive, manageable and widely available material - glass wool - can act as a catalyst support for a number of different reactions. Different metal and metal oxide nanoparticles, based on Pd, Co, Cu, Au and Ru, were deposited on glass wool and used as heterogeneous catalysts for a variety of thermal and photochemical organic reactions including reductive de-halogenation of aryl halides, reduction of nitrobenzene, Csp3-Csp3 couplings, N-C heterocycloadditions (click chemistry) and Csp-Csp2 couplings (Sonogashira couplings). The use of glass wool as a catalyst support for important organic reactions, particularly C-C couplings, opens the opportunity to develop economical heterogeneous catalysts with excellent potential for flow photo-chemistry application.
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Affiliation(s)
- Ayda Elhage
- Department of Chemistry and Biomolecular Science , Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
| | - Bowen Wang
- Department of Chemistry and Biomolecular Science , Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
| | - Nancy Marina
- Department of Chemistry and Biomolecular Science , Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
| | - M Luisa Marin
- Department of Chemistry and Biomolecular Science , Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
| | - Menandro Cruz
- Department of Chemistry and Biomolecular Science , Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
| | - Anabel E Lanterna
- Department of Chemistry and Biomolecular Science , Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Science , Centre for Advanced Materials Research (CAMaR) , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
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33
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Affiliation(s)
- Nancy Marina
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Anabel E. Lanterna
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Juan C. Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
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34
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Weerasekera HDA, Silvero MJ, Regis Correa da Silva D, Scaiano JC. A database on the stability of silver and gold nanostructures for applications in biology and biomolecular sciences. Biomater Sci 2018; 5:89-97. [PMID: 27822576 DOI: 10.1039/c6bm00629a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Colloidal stability of nanoparticles in biological media is an important consideration when trying to ensure reliable data interpretation of in vitro and in vivo systems. We have developed a detailed colloidal stability library of newly synthesized gold, silver and gold-core silver-shell plasmonic nanoparticles, stabilized with aspartame, glucosamine and sucralose, in various biologically relevant buffers and bacterial and mammalian cell culture media. The stabilizer selection reflects the preference for molecules that are non-toxic, inexpensive, readily available, water soluble and easy-to-replace if that is the end-user preference. An on-line resource provides detailed stability information on each of the 81 systems examined. To illustrate how to utilize this stability library, we conducted bacterial toxicity and biocompatibility experiments through the use of one specific set of nanomaterials in the presence and absence of plasmonic irradiation.
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Affiliation(s)
- Hasitha de Alwis Weerasekera
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ontario, CanadaK1N 6N5.
| | - María Jazmín Silvero
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ontario, CanadaK1N 6N5. and Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, 5000 Córdoba, Argentina and Instituto Multidisciplinario de Biología Vegetal (CONICET), Departamento de Farmacia, Universidad Nacional de Córdoba, 5000 Córdoba, Argentina
| | - Daliane Regis Correa da Silva
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ontario, CanadaK1N 6N5.
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, Ontario, CanadaK1N 6N5.
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35
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Pitre SP, Yoon TP, Scaiano JC. Titanium dioxide visible light photocatalysis: surface association enables photocatalysis with visible light irradiation. Chem Commun (Camb) 2018; 53:4335-4338. [PMID: 28367554 DOI: 10.1039/c7cc01952a] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Titanium dioxide (TiO2) is a widely employed and inexpensive photocatalyst, but its use in organic synthesis has been limited by the short-wavelength ultraviolet irradiation typically used. We have discovered that TiO2 particles efficiently mediate photocatalytic radical cation Diels-Alder cycloadditions using a simple visible light source, enabled by the formation of a visible light absorbing complex of the substrate on the semiconductor surface.
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Affiliation(s)
- Spencer P Pitre
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie Private, Ottawa, ON K1N 6N5, Canada.
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36
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Affiliation(s)
- Gregory K. Hodgson
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Juan C. Scaiano
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
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37
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Silvero C. MJ, Rocca DM, de la Villarmois EA, Fournier K, Lanterna AE, Pérez MF, Becerra MC, Scaiano JC. Selective Photoinduced Antibacterial Activity of Amoxicillin-Coated Gold Nanoparticles: From One-Step Synthesis to in Vivo Cytocompatibility. ACS Omega 2018; 3:1220-1230. [PMID: 30023798 PMCID: PMC6045397 DOI: 10.1021/acsomega.7b01779] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Accepted: 01/17/2018] [Indexed: 05/18/2023]
Abstract
Photoinduced antibacterial gold nanoparticles were developed as an alternative for the treatment of antibiotic-resistant bacteria. Thanks to the amoxicillin coating, they possess high in vivo stability, selectivity for the bacteria wall, a good renal clearance, and are completely nontoxic for eukaryotic cells at the bactericidal concentrations. A simple one-step synthesis of amoxi@AuNP is described at mild temperatures using the antibiotic as both reducing and stabilizing agent. Time-resolved fluorescence microscopy proved these novel nano-photosensitizers, with improved selectivity, are bactericidal but showing excellent biocompatibility toward eukaryotic cells at the same dose (1.5 μg/mL) when co-cultures are analyzed. Their stability in biological media, hemocompatibility, and photo-antibacterial effect against sensitive and antibiotic-resistant Staphylococcus aureus were evaluated in vitro, whereas toxicity, renal clearance, and biodistribution were studied in vivo in male Wistar rats. The use of these nanoparticles to treat antibiotic-resistant infections is promising given their high stability and cytocompatibility.
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Affiliation(s)
- M. Jazmín Silvero C.
- Department
of Chemistry and Biomolecular Sciences and Centre for Advanced Materials
Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
- Instituto Multidisciplinario de
Biología Vegetal (IMBIV-CONICET),
Departamento de Ciencias Farmacéuticas and Instituto de Farmacología
Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología,
Facultad de Ciencias Químicas, Universidad
Nacional de Córdoba, Haya de la Torre S/N, Córdoba X5000, Argentina
| | - Diamela M. Rocca
- Instituto Multidisciplinario de
Biología Vegetal (IMBIV-CONICET),
Departamento de Ciencias Farmacéuticas and Instituto de Farmacología
Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología,
Facultad de Ciencias Químicas, Universidad
Nacional de Córdoba, Haya de la Torre S/N, Córdoba X5000, Argentina
| | - Emilce Artur de la Villarmois
- Instituto Multidisciplinario de
Biología Vegetal (IMBIV-CONICET),
Departamento de Ciencias Farmacéuticas and Instituto de Farmacología
Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología,
Facultad de Ciencias Químicas, Universidad
Nacional de Córdoba, Haya de la Torre S/N, Córdoba X5000, Argentina
| | - Kelsey Fournier
- Department
of Chemistry and Biomolecular Sciences and Centre for Advanced Materials
Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Anabel E. Lanterna
- Department
of Chemistry and Biomolecular Sciences and Centre for Advanced Materials
Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Mariela F. Pérez
- Instituto Multidisciplinario de
Biología Vegetal (IMBIV-CONICET),
Departamento de Ciencias Farmacéuticas and Instituto de Farmacología
Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología,
Facultad de Ciencias Químicas, Universidad
Nacional de Córdoba, Haya de la Torre S/N, Córdoba X5000, Argentina
| | - M. Cecilia Becerra
- Instituto Multidisciplinario de
Biología Vegetal (IMBIV-CONICET),
Departamento de Ciencias Farmacéuticas and Instituto de Farmacología
Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología,
Facultad de Ciencias Químicas, Universidad
Nacional de Córdoba, Haya de la Torre S/N, Córdoba X5000, Argentina
| | - Juan C. Scaiano
- Department
of Chemistry and Biomolecular Sciences and Centre for Advanced Materials
Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
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38
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Liras M, Simoncelli S, Rivas-Aravena A, García O, Scaiano JC, Alarcon EI, Aspée A. Nitroxide amide-BODIPY probe behavior in fibroblasts analyzed by advanced fluorescence microscopy. Org Biomol Chem 2018; 14:4023-6. [PMID: 27065020 DOI: 10.1039/c6ob00533k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A novel synthesized nitroxide amide-BODIPY prefluorescent probe was used to study cellular redox balance that modulates nitroxide/hydroxylamine ratio in cultured human fibroblasts. FLIM quantitatively differentiated between nitroxide states of the cytoplasm-localized probe imaged by TIRF, monitoring nitroxide depletion by hydrogen peroxide; eluding incorrect interpretation if only fluorescence intensity is considered.
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Affiliation(s)
- M Liras
- Instituto de Ciencia y Tecnología de Polímeros, Consejo Superior de Investigaciones Científicas (ICTP-CSIC), Juan de la Cierva 3, 28006, Madrid, España and Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada
| | - S Simoncelli
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada and INQUIMAE and Departamento de Química Inorgánica, Analítica, y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
| | - A Rivas-Aravena
- Laboratorio de Radiobiología Molecular y Celular, Departamento de Aplicaciones Nucleares, Comisión Chilena de Energía Nuclear, Santiago, Chile
| | - O García
- Instituto de Ciencia y Tecnología de Polímeros, Consejo Superior de Investigaciones Científicas (ICTP-CSIC), Juan de la Cierva 3, 28006, Madrid, España
| | - J C Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada
| | - E I Alarcon
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada and Bio-nanomaterials Chemistry and Engineering Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin St., Ottawa, Ontario K1Y 4W7, Canada.
| | - A Aspée
- Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago, Chile.
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39
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Rocca DM, Vanegas JP, Fournier K, Becerra MC, Scaiano JC, Lanterna AE. Biocompatibility and photo-induced antibacterial activity of lignin-stabilized noble metal nanoparticles. RSC Adv 2018; 8:40454-40463. [PMID: 35558201 PMCID: PMC9091494 DOI: 10.1039/c8ra08169g] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 11/25/2018] [Indexed: 12/02/2022] Open
Abstract
One-pot thermal and photochemical syntheses of lignin-doped silver and gold nanoparticles were developed and their antimicrobial properties were studied against Escherichia coli and Staphylococcus aureus. The nature of the lignin as well as the metal are directly involved in the antimicrobial activity observed in these nanocomposites. Whereas one of the nanocomposites is innocuous under dark conditions and shows photoinduced activity only against Staphylococcus aureus, the rest of the lignin-coated silver nanoparticles studied show antimicrobial activity under dark and light conditions for both bacteria strains. Additionally, only photoinduced activity is observed for lignin-coated gold nanoparticles. Importantly, the particles are non-cytotoxic towards human cells at the bactericidal concentrations. Preliminary assays show these silver nanoparticles as potential antimicrobial agents towards S. aureus biofilm eradication. Natural derived compounds, lignins, can be used as reducing and stabilizing agents to synthesize noble metal nanoparticles with antimicrobial properties.![]()
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Affiliation(s)
- Diamela María Rocca
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR)
- University of Ottawa
- Ottawa
- Canada
- Departamento de Ciencias Farmacéuticas
| | - Julie P. Vanegas
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR)
- University of Ottawa
- Ottawa
- Canada
- Liquid Crystal Institute
| | - Kelsey Fournier
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR)
- University of Ottawa
- Ottawa
- Canada
| | - M. Cecilia Becerra
- Departamento de Ciencias Farmacéuticas
- Facultad de Ciencias Químicas
- Universidad Nacional de Córdoba
- Córdoba
- Argentina
| | - Juan C. Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR)
- University of Ottawa
- Ottawa
- Canada
| | - Anabel E. Lanterna
- Department of Chemistry and Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR)
- University of Ottawa
- Ottawa
- Canada
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40
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Affiliation(s)
- Bowen Wang
- Department of Chemistry and
Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Anabel E. Lanterna
- Department of Chemistry and
Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Juan C. Scaiano
- Department of Chemistry and
Biomolecular Sciences and Centre for Advanced Materials Research (CAMaR), University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
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41
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McCallum T, Pitre SP, Morin M, Scaiano JC, Barriault L. The photochemical alkylation and reduction of heteroarenes. Chem Sci 2017; 8:7412-7418. [PMID: 29163892 PMCID: PMC5674141 DOI: 10.1039/c7sc03768f] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 09/09/2017] [Indexed: 01/14/2023] Open
Abstract
The functionalization of heteroarenes has been integral to the structural diversification of medicinally active molecules such as quinolines, pyridines, and phenanthridines. Electron-deficient heteroarenes are electronically compatible to react with relatively nucleophilic free radicals such as hydroxyalkyl. However, the radical functionalization of such heteroarenes has been marked by the use of transition-metal catalyzed processes that require initiators and stoichiometric oxidants. Herein, we describe the photochemical alkylation of quinolines, pyridines and phenanthridines, where through direct excitation of the protonated heterocycle, alcohols and ethers, such as methanol and THF, can serve as alkylating agents. We also report the discovery of a photochemical reduction of these heteroarenes using only iPrOH and HCl. Mechanistic studies to elucidate the underlying mechanism of these transformations, and preliminary results on catalytic methylations are also reported.
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Affiliation(s)
- T McCallum
- Centre for Catalysis , Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
| | - S P Pitre
- Centre for Catalysis , Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
| | - M Morin
- Centre for Catalysis , Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
| | - J C Scaiano
- Centre for Catalysis , Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
| | - L Barriault
- Centre for Catalysis , Research and Innovation , Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie Curie , Ottawa , ON K1N 6N5 , Canada . ;
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42
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Vanegas JP, Scaiano JC, Lanterna AE. Thiol-Stabilized Gold Nanoparticles: New Ways To Displace Thiol Layers Using Yttrium or Lanthanide Chlorides. Langmuir 2017; 33:12149-12154. [PMID: 28985672 DOI: 10.1021/acs.langmuir.7b01898] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We use the aurophilic interactions shown by lanthanides to overcome the sulfur-gold interaction. UV-vis and X-ray photoelectron spectroscopy confirm that yttrium or lanthanide chlorides easily displace sulfur ligands from the surface of thiol-stabilized gold nanoparticles.
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Affiliation(s)
- Julie P Vanegas
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa , 10 Marie Curie, Ottawa, Ontario K1N 5N6, Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa , 10 Marie Curie, Ottawa, Ontario K1N 5N6, Canada
| | - Anabel E Lanterna
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa , 10 Marie Curie, Ottawa, Ontario K1N 5N6, Canada
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43
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Abstract
Indole alkaloids represent an important class of molecules, with many naturally occurring derivatives possessing significant biological activity. One area that requires further development in the synthesis of indole derivatives is the Diels-Alder reaction. In this work, we expand on our previously developed heterogeneous protocol for the [4+2] cycloaddition of indoles and electron-rich dienes mediated by platinum nanoparticles supported on titanium dioxide semiconductor particles (Pt(0.2%)@TiO2) with visible-light irradiation. This reaction proceeds with broad scope and is more efficient per incident photon than the previous homogeneous method, and the catalyst can be easily recycled and reused.
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Affiliation(s)
- Spencer P. Pitre
- Department
of Chemistry and Biomolecular Sciences and Centre for Catalysis Research
and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Juan C. Scaiano
- Department
of Chemistry and Biomolecular Sciences and Centre for Catalysis Research
and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Tehshik P. Yoon
- Department
of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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44
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Lanterna AE, González-Béjar M, Frenette M, Scaiano JC. Photophysics of 7-mercapto-4-methylcoumarin and derivatives: complementary fluorescence behaviour to 7-hydroxycoumarins. Photochem Photobiol Sci 2017. [PMID: 28650505 DOI: 10.1039/c7pp00121e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photophysical behaviour of 7-mercapto-4-methylcoumarin (C-SH) and derivatives has been studied in different solvents. In contrast to 7-hydroxy-4-methylcoumarin, C-SH shows poor emission, but high fluorescence when the thiol is alkylated. The origin and character of the lowest singlet states are discussed, specifically proposing that the thione-like C[double bond, length as m-dash]S resonance form plays a key role in excited state deactivation in C-SH.
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Affiliation(s)
- Anabel E Lanterna
- Center of Catalysis Research and Innovation (CCRI) and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Canada.
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45
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Fasciani C, Lanterna AE, Giorgi JB, Scaiano JC. Visible Light Production of Hydrogen by Ablated Graphene: Water Splitting or Carbon Gasification? J Am Chem Soc 2017; 139:11024-11027. [DOI: 10.1021/jacs.7b06570] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chiara Fasciani
- Department of Chemistry and
Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Anabel E. Lanterna
- Department of Chemistry and
Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Javier B. Giorgi
- Department of Chemistry and
Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Juan C. Scaiano
- Department of Chemistry and
Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
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46
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Aspée A, Aliaga C, Maretti L, Zúñiga-Núñez D, Godoy J, Pino E, Cárdenas-Jirón G, Lopez-Alarcon C, Scaiano JC, Alarcon EI. Reaction Kinetics of Phenolic Antioxidants toward Photoinduced Pyranine Free Radicals in Biological Models. J Phys Chem B 2017; 121:6331-6340. [DOI: 10.1021/acs.jpcb.7b02779] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexis Aspée
- Facultad
de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago, Chile
| | - Christian Aliaga
- Facultad
de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago, Chile
| | - Luca Maretti
- Department
of Chemistry and Biomolecular Sciences and Centre for Catalysis Research
and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada
| | - Daniel Zúñiga-Núñez
- Facultad
de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago, Chile
| | - Jessica Godoy
- Facultad
de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago, Chile
| | - Eduardo Pino
- Facultad
de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago, Chile
| | - Gloria Cárdenas-Jirón
- Facultad
de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago, Chile
| | - Camilo Lopez-Alarcon
- Departamento
de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile, C.P. 782 0436, Santiago, Chile
| | - Juan C. Scaiano
- Department
of Chemistry and Biomolecular Sciences and Centre for Catalysis Research
and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada
| | - Emilio I. Alarcon
- Department
of Chemistry and Biomolecular Sciences and Centre for Catalysis Research
and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada
- Bio-nanomaterials
Chemistry and Engineering Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Ottawa, Ontario K1Y 4W7, Canada
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47
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Scaiano JC, Lanterna AE. Is Single-Molecule Fluorescence Spectroscopy Ready To Join the Organic Chemistry Toolkit? A Test Case Involving Click Chemistry. J Org Chem 2017; 82:5011-5019. [DOI: 10.1021/acs.joc.6b03010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juan C. Scaiano
- Department of Chemistry and
Biomolecular Sciences and Centre for Catalysis Research and Innovation
(CCRI), University of Ottawa. 10 Marie Curie, Ottawa, ON K1N 6N5, Canada
| | - Anabel E. Lanterna
- Department of Chemistry and
Biomolecular Sciences and Centre for Catalysis Research and Innovation
(CCRI), University of Ottawa. 10 Marie Curie, Ottawa, ON K1N 6N5, Canada
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48
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McTiernan CD, Leblanc X, Scaiano JC. Heterogeneous Titania-Photoredox/Nickel Dual Catalysis: Decarboxylative Cross-Coupling of Carboxylic Acids with Aryl Iodides. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03687] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Christopher D. McTiernan
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Xavier Leblanc
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Juan C. Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
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49
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Wang B, Durantini J, Decan MR, Nie J, Lanterna AE, Scaiano JC. From the molecule to the mole: improving heterogeneous copper catalyzed click chemistry using single molecule spectroscopy. Chem Commun (Camb) 2017; 53:328-331. [DOI: 10.1039/c6cc08905d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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50
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Abstract
Several hybrid mesoporous materials were synthesized in order to obtain a drug/cargo delivery system in which it is possible to control both the start and rate of the cargo release via surface plasmon (SPR) excitation. The successful incorporation of a thermoresponsive gate based on a cucurbit[6]uril-hexamethylene diamine (CB6-Hex) host-guest complex conferred the system with the desired "zero" premature release. This feature combined with the incorporation of gold nanorods (AuNR) and gold nanoparticles (AuNP) capable of acting as a heat source upon SPR excitation enabled a controlled cargo release system active to green and NIR irradiation. The results obtained prove that it is possible to disassemble the CB6-Hex gate complex in a few minutes using either green or NIR irradiation in order to activate the system and start the release process (that can take hours), as well as to further control the diffusion of Naproxen as a model drug.
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Affiliation(s)
- Daniela T Marquez
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa , 10, Marie Curie, Ottawa, Ontario K1N6N5, Canada
| | - Juan C Scaiano
- Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa , 10, Marie Curie, Ottawa, Ontario K1N6N5, Canada
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