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Aminfar P, Yousefalizadeh G, Steele E, Chen J, Zheng G, Stamplecoskie KG. Photochemical synthesis of fluorescent Au 16(RGDC) 14 and excited state reactivity with molecular oxygen. Nanoscale 2023; 15:13561-13566. [PMID: 37551778 DOI: 10.1039/d3nr02258g] [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] [Indexed: 08/09/2023]
Abstract
Aqueous metal nanoclusters have emerged as effective materials for biomedical imaging and therapy. Among them, gold nanoclusters (AuNCs) have been widely studied due to their unique electronic structures. These nanoclusters are often optically impure, comprising a mixture of fluorescent clusters with different metal/ligand compositions. The polydispersity of nanoclusters makes it challenging to isolate the most stable structure, and poses further risks for eventual clinical applications. Herein, Au16L14 clusters are reported which are optically pure as assessed by fluorescence excitation-emission matrix (EEM) spectroscopy and parallel factor (PARAFAC) analysis. The reactivity of their excited state with molecular oxygen was also probed, demonstrating that the Au16L14 clusters generate type I reactive oxygen species (ROS), which can make them effective sensitizers for photodynamic therapy.
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Affiliation(s)
- Parimah Aminfar
- Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada.
| | | | - Emily Steele
- Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada.
| | - Juan Chen
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, M5G 1L7, Canada
- Institute of Biomaterials and Biomedical Engineering and Department of Medical Biophysics, University of Toronto, Toronto, Ontario, M5S 3G9, Canada
| | - Gang Zheng
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, M5G 1L7, Canada
- Institute of Biomaterials and Biomedical Engineering and Department of Medical Biophysics, University of Toronto, Toronto, Ontario, M5S 3G9, Canada
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Gorobets E, Papatzimas JW, Dourado J, Yousefalizadeh G, Lee J, Brownsey DK, Stamplecoskie K, Davis R, Derksen DJ. A Vinylogous Norrish Reaction as a Strategy for Light-Mediated Ring Expansion. Chem Commun (Camb) 2022; 58:2910-2913. [DOI: 10.1039/d2cc00513a] [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: 11/21/2022]
Abstract
The reactions of bicyclic divinyl ketones display wavelength-dependent changes in product formation. UV irradiation results in the formation of competitive [6,3,5] and [7,3,5] tricyclic unsaturated ketones that subsequently undergo ring...
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Abstract
Superatom clusters, Au25(SR)18, and the silver analog and alloys of the two metals have been extensively investigated for their structure, stability, photoluminescence, and electronic properties. One can readily tune the physicochemical properties by varying the ratio of Au/Ag or the thiol ligand to attain desired properties, such as enhanced emission, increased stability, and catalytic activity. Herein, excitation emission matrix spectroscopy and pump-probe transient absorption spectroscopy are used to show that the excited state dynamics of Au25(SR)18, Ag25(SR)18, and their alloys differ significantly despite having similar structures. State-resolved excited state behavior that is well documented for gold clusters is largely affected by the metal composition, becoming less pronounced for silver analogs, resulting in diversity in terms of their excited state energy and relaxation dynamics and resultant photophysical properties, such as emission.
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Affiliation(s)
- Goonay Yousefalizadeh
- Department of Chemistry, Queen's University, Chernoff Hall, Kingston, Ontario K7L 3N6, Canada
| | - Kevin G Stamplecoskie
- Department of Chemistry, Queen's University, Chernoff Hall, Kingston, Ontario K7L 3N6, Canada
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Abstract
Noble metal clusters have unique photophysical properties, especially as a new class of materials for multiphoton biomedical imaging. The previously studied Au25SR18 exhibits "giant" two-photon absorbance cross sections. Herein, we investigate the origins of the large two photon absorption for Au25SR18, as well as 10 other Au and Ag clusters using femtosecond pump/probe transient absorption spectroscopy (fsTAS). Excited state absorbance (ESA) ubiquitous to thiolated Au and Ag clusters is used herein as an optical signature of two-photon absorbances of the 11 different Au and Ag clusters, which does not require high quantum yields of emission. The large selection of clusters, studied with a single laser system, allows us to draw conclusions on the role of the particular metal, cluster size/structure, and the effects of the ligands on the ability to absorb multiple NIR photons. The use of a laser with a 1028 nm excitation also allows us to investigate the dramatic effect of excitation wavelength and explain why laser wavelength has led to large variances in the non-linear responses reported for clusters to date. We discuss the double resonance mechanism, responsible for giant two photon absorbance cross-sections, helping match properties of metal clusters with experimental conditions for maximizing signal/response in multiphoton applications.
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Affiliation(s)
- Goonay Yousefalizadeh
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada.
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Charron DM, Yousefalizadeh G, Buzzá HH, Rajora MA, Chen J, Stamplecoskie KG, Zheng G. Correction to "Photophysics of J-Aggregating Porphyrin-Lipid Photosensitizers in Liposomes: Impact of Lipid Saturation". Langmuir 2020; 36:9985. [PMID: 32799516 DOI: 10.1021/acs.langmuir.0c02199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
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Charron DM, Yousefalizadeh G, Buzzá HH, Rajora MA, Chen J, Stamplecoskie KG, Zheng G. Photophysics of J-Aggregating Porphyrin-Lipid Photosensitizers in Liposomes: Impact of Lipid Saturation. Langmuir 2020; 36:5385-5393. [PMID: 32338515 DOI: 10.1021/acs.langmuir.0c00843] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Porphyrin aggregates have attractive photophysical properties for phototherapy and optical imaging, including quenched photosensitization, efficient photothermal conversion, and unique absorption spectra. Although hydrophobic porphyrin photosensitizers have long been encapsulated into liposomes for drug delivery, little is known about the membrane properties of liposomes with large amphiphilic porphyrin compositions. In this paper, a porphyrin-lipid conjugate was incorporated into liposomes formed of saturated or unsaturated lipids to study the membrane composition-dependent formation of highly ordered porphyrin J-aggregates and disordered aggregates. Porphyrin-lipid readily phase-separates in saturated membranes, forming J-aggregates that are destabilized during the ripple phase below the main thermal transition. Porphyrin-lipid J-aggregates are photostable with a photothermal efficiency of 54 ± 6%, comparable to gold. Even at high porphyrin-lipid compositions, porphyrin J-aggregates coexist with a minority population of disordered aggregates, which are photodynamically active despite being fluorescently quenched. For photothermal applications, liposome formulations that encourage porphyrin-lipid phase separation should be explored for maximum J-aggregation.
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Affiliation(s)
- Danielle M Charron
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G9, Canada
| | | | - Hilde H Buzzá
- São Carlos Institute of Physics, University of São Paulo (USP), CEP 13563-120 São Carlos, Brazil
| | - Maneesha A Rajora
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G9, Canada
| | - Juan Chen
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada
| | | | - Gang Zheng
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 1L7, Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G9, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 1L7, Canada
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Narouz MR, Takano S, Lummis PA, Levchenko TI, Nazemi A, Kaappa S, Malola S, Yousefalizadeh G, Calhoun LA, Stamplecoskie KG, Häkkinen H, Tsukuda T, Crudden CM. Robust, Highly Luminescent Au 13 Superatoms Protected by N-Heterocyclic Carbenes. J Am Chem Soc 2019; 141:14997-15002. [PMID: 31497943 DOI: 10.1021/jacs.9b07854] [Citation(s) in RCA: 128] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Gold superatom nanoclusters stabilized entirely by N-heterocyclic carbenes (NHCs) and halides are reported. The reduction of well-defined NHC-Au-Cl complexes produces clusters comprised of an icosahedral Au13 core surrounded by a symmetrical arrangement of nine NHCs and three chlorides. X-ray crystallography shows that the clusters are characterized by multiple CH-π and π-π interactions, which rigidify the ligand and likely contribute to the exceptionally high photoluminescent quantum yields observed, up to 16.0%, which is significantly greater than that of the most luminescent ligand-protected Au13 superatom cluster. Density functional theory analysis suggests that clusters are 8-electron superatoms with a wide HOMO-LUMO energy gap of 2 eV. Consistent with this, the clusters have high stability relative to phosphine stabilized clusters.
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Affiliation(s)
- Mina R Narouz
- Department of Chemistry , Queen's University , Chernoff Hall, Kingston , Ontario K7L 3N6 , Canada
| | - Shinjiro Takano
- Department of Chemistry, School of Science , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan
| | - Paul A Lummis
- Department of Chemistry , Queen's University , Chernoff Hall, Kingston , Ontario K7L 3N6 , Canada
| | - Tetyana I Levchenko
- Department of Chemistry , Queen's University , Chernoff Hall, Kingston , Ontario K7L 3N6 , Canada
| | - Ali Nazemi
- Department of Chemistry , Queen's University , Chernoff Hall, Kingston , Ontario K7L 3N6 , Canada
| | - Sami Kaappa
- Departments of Chemistry and Physics, Nanoscience Center , University of Jyväskylä , 40014 Jyväskylä , Finland
| | - Sami Malola
- Departments of Chemistry and Physics, Nanoscience Center , University of Jyväskylä , 40014 Jyväskylä , Finland
| | - Goonay Yousefalizadeh
- Department of Chemistry , Queen's University , Chernoff Hall, Kingston , Ontario K7L 3N6 , Canada
| | - Larry A Calhoun
- Department of Chemistry , University of New Brunswick Fredericton , New Brunswick E3B 5A3 , Canada
| | - Kevin G Stamplecoskie
- Department of Chemistry , Queen's University , Chernoff Hall, Kingston , Ontario K7L 3N6 , Canada
| | - Hannu Häkkinen
- Departments of Chemistry and Physics, Nanoscience Center , University of Jyväskylä , 40014 Jyväskylä , Finland
| | - Tatsuya Tsukuda
- Department of Chemistry, School of Science , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan.,Elements Strategy Initiative for Catalysts and Batteries (ESICB) , Kyoto University , Katsura , Kyoto 615-8520 , Japan
| | - Cathleen M Crudden
- Department of Chemistry , Queen's University , Chernoff Hall, Kingston , Ontario K7L 3N6 , Canada.,Institute of Transformative Bio-Molecules (WPI-ITbM) , Nagoya University , Chikusa, Nagoya 464-8602 , Japan
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Mellerup SK, Yousefalizadeh G, Wang S, Stamplecoskie KG. Experimental Evidence for a Triplet Biradical Excited-State Mechanism in the Photoreactivity of N,C-Chelate Organoboron Compounds. J Phys Chem A 2018; 122:9267-9274. [PMID: 30408414 DOI: 10.1021/acs.jpca.8b10624] [Citation(s) in RCA: 10] [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: 01/26/2023]
Abstract
N,C-chelate organoborates represent an emerging class of photoresponsive materials due to their photochromic switching at a boron center. Despite the promising applicability of such systems, little is known about the excited-state processes that lead to their unique photoreactivity, which is detrimental to the design of next-generation smart materials based on boron. As part of our ongoing effort to understand and improve the utility of these organoboron compounds, we report some of the first experimental evidence to support an excited-state mechanism for N,C-chelate organoborates. Femtosecond transient absorption spectroscopy combined with steady-state UV/vis and fluorescence measurements gives direct insight into their underlying photochemical processes, such as the formation of a common triplet charge-transfer state which either relaxes radiatively or undergoes the desired photoisomerization through a biradical intermediate. With this information, a complete mechanistic picture of the excited-state reactivity of N,C-chelate organoborates has been established, which is anticipated to lead to new smart materials with improved performance.
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Affiliation(s)
- Soren K Mellerup
- Department of Chemistry , Queen's University , Kingston , Ontario K7L3N6 , Canada
| | | | - Suning Wang
- Department of Chemistry , Queen's University , Kingston , Ontario K7L3N6 , Canada
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Yuan K, Yousefalizadeh G, Saraci F, Peng T, Kozin I, Stamplecoskie KG, Wang S. Impact of Ferrocene Substitution on the Electronic Properties of BODIPY Derivatives and Analogues. Inorg Chem 2018; 57:14698-14704. [DOI: 10.1021/acs.inorgchem.8b02476] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Kang Yuan
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada
| | | | - Felix Saraci
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada
| | - Tai Peng
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
| | - Igor Kozin
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada
| | | | - Suning Wang
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada
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Jacques E, Ahumada M, Rector B, Yousefalizadeh G, Galaz-Araya C, Recabarren R, Stamplecoskie K, Poblete H, Alarcon EI. Effect of nanosilver surfaces on peptide reactivity towards reactive oxygen species. Nanoscale 2018; 10:15911-15917. [PMID: 30106074 DOI: 10.1039/c8nr04018d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The interaction of a terminal tryptophan residue within collagen mimetic peptides when tethered to nanometric silver surfaces was studied using a combination of steady state spectroscopy, ultrafast spectroscopy, and molecular dynamics experiments. Our findings indicate that the effective interaction between the tryptophan and the metal surface occurs in short-time scales (ps) and it is responsible for improving the colloidal stability of the nanoparticles exposed to free radicals. The extent and efficiency of the interaction depends on factors beyond the peptide length that include conformation and distance from the terminal tryptophan to the metal surface.
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Affiliation(s)
- Erik Jacques
- Bio-Nanomaterials Chemistry and Engineering Laboratory, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Ottawa, Ontario K1Y 4 W7, Canada.
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Yousefalizadeh G, Stamplecoskie KG. Norrish type I photochemistry as a powerful tool in the isolation of thiol protected Au25SR18 clusters. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.11.033] [Citation(s) in RCA: 5] [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: 11/29/2022]
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Khoee S, Yousefalizadeh G, Kavand A. Preparation of dual-targeted redox-responsive nanogels based on pegylated sorbitan for targeted and antitumor drug delivery. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.08.030] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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