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Gupta AK, Marshall N, Yourston L, Rolband L, Beasock D, Danai L, Skelly E, Afonin KA, Krasnoslobodtsev AV. Optical, structural, and biological properties of silver nanoclusters formed within the loop of a C-12 hairpin sequence. NANOSCALE ADVANCES 2023; 5:3500-3511. [PMID: 37383066 PMCID: PMC10295035 DOI: 10.1039/d3na00092c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Accepted: 06/04/2023] [Indexed: 06/30/2023]
Abstract
Silver nanoclusters (AgNCs) are the next-generation nanomaterials representing supra-atomic structures where silver atoms are organized in a particular geometry. DNA can effectively template and stabilize these novel fluorescent AgNCs. Only a few atoms in size - the properties of nanoclusters can be tuned using only single nucleobase replacement of C-rich templating DNA sequences. A high degree of control over the structure of AgNC could greatly contribute to the ability to fine-tune the properties of silver nanoclusters. In this study, we explore the properties of AgNCs formed on a short DNA sequence with a C12 hairpin loop structure (AgNC@hpC12). We identify three types of cytosines based on their involvement in the stabilization of AgNCs. Computational and experimental results suggest an elongated cluster shape with 10 silver atoms. We found that the properties of the AgNCs depend on the overall structure and relative position of the silver atoms. The emission pattern of the AgNCs depends strongly on the charge distribution, while all silver atoms and some DNA bases are involved in optical transitions based on molecular orbital (MO) visualization. We also characterize the antibacterial properties of silver nanoclusters and propose a possible mechanism of action based on the interactions of AgNCs with molecular oxygen.
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Affiliation(s)
- Akhilesh Kumar Gupta
- Department of Physics, University of Nebraska at Omaha Omaha NE 68182 USA +1402-554-3723
| | - Nolan Marshall
- Department of Physics, University of Nebraska at Omaha Omaha NE 68182 USA +1402-554-3723
| | - Liam Yourston
- Department of Physics, University of Nebraska at Omaha Omaha NE 68182 USA +1402-554-3723
| | - Lewis Rolband
- Nanoscale Science Program, Department of Chemistry, University of North Carolina at Charlotte Charlotte NC 28223 USA
| | - Damian Beasock
- Nanoscale Science Program, Department of Chemistry, University of North Carolina at Charlotte Charlotte NC 28223 USA
| | - Leyla Danai
- Nanoscale Science Program, Department of Chemistry, University of North Carolina at Charlotte Charlotte NC 28223 USA
| | - Elizabeth Skelly
- Nanoscale Science Program, Department of Chemistry, University of North Carolina at Charlotte Charlotte NC 28223 USA
| | - Kirill A Afonin
- Nanoscale Science Program, Department of Chemistry, University of North Carolina at Charlotte Charlotte NC 28223 USA
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Saltiel J, Krishnan SB, Gupta S, Hernberg EA, Clark RJ. Photochemistry and photophysics of cholesta-5,7,9(11)-trien-3β-ol: a fluorescent analogue of cholesterol. Photochem Photobiol Sci 2022; 21:37-47. [PMID: 35000147 DOI: 10.1007/s43630-021-00131-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Accepted: 11/01/2021] [Indexed: 10/19/2022]
Abstract
Cholesta-5,7,9(11)-trien-3β-ol (9,11-dehydroprovitamin D3, CTL) is used as a fluorescent probe to track the presence and migration of cholesterol in vivo. CTL is known to be photochemically active, but little consideration has been given to the formation efficiency and possible toxicity of its photoproducts. In degassed tetrahydrofuran (THF) solution, we isolated the photoproduct of CTL and of its 25-hydroxy derivative (HOCTL), and X-ray crystal structures were obtained for HOCTL and the photorearrangement product. The X-ray crystal structure and its 1H NMR spectrum confirm the product structure as a pentacyclic HOCTL isomer. In the presence of air in THF, endoperoxide formation via [2+4] addition of 1O2* across the B ring of CTL or HOCTL becomes the dominant photoreaction. The UV spectrum and decay kinetics of the triplet state of HOCTL, the precursor of 1O2*, are determined by transient absorption spectroscopy. We confirm the proposed structure of the endoperoxide by X-ray crystallography. Kinetics analysis of quantum yields provides rate constants for photophysical and photochemical events.
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Affiliation(s)
- Jack Saltiel
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306-4390, USA.
| | - Sumesh B Krishnan
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306-4390, USA
| | - Shipra Gupta
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306-4390, USA
| | - E Aliea Hernberg
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306-4390, USA
| | - Ronald J Clark
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306-4390, USA
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Miyazawa Y, Wang Z, Matsumoto M, Hatano S, Antol I, Kayahara E, Yamago S, Abe M. 1,3-Diradicals Embedded in Curved Paraphenylene Units: Singlet versus Triplet State and In-Plane Aromaticity. J Am Chem Soc 2021; 143:7426-7439. [PMID: 33900091 DOI: 10.1021/jacs.1c01329] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Curved π-conjugated molecules and open-shell structures have attracted much attention from the perspective of fundamental chemistry, as well as materials science. In this study, the chemistry of 1,3-diradicals (DRs) embedded in curved cycloparaphenylene (CPPs) structures, DR-(n+3)CPPs (n = 0-5), was investigated to understand the effects of the curvature and system size on the spin-spin interactions and singlet versus triplet state, as well as their unique characteristics such as in-plane aromaticity. A triplet ground state was predicted for the larger 1,3-diradicals, such as the seven- and eight-paraphenylene-unit-containing diradicals DR-7CPP (n = 4) and DR-8CPP (n = 5), by quantum chemical calculations. The smaller-sized diradicals DR-(n+3)CPPs (n = 0-3) were found to possess singlet ground states. Thus, the ground-state spin multiplicity is controlled by the size of the paraphenylene cycle. The size effect on the ground-state spin multiplicity was confirmed by the experimental generation of DR-6CPP in the photochemical denitrogenation of its azo-containing precursor (AZ-6CPP). Intriguingly, a unique type of in-plane aromaticity emerged in the smaller-sized singlet states such as S-DR-4CPP (n = 1), as proven by nucleus-independent chemical shift calculations (NICS) and an analysis of the anisotropy of the induced current density (ACID), which demonstrate that homoconjugation between the 1,3-diradical moiety arises because of the curved and distorted bonding system.
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Affiliation(s)
- Yuki Miyazawa
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Zhe Wang
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Misaki Matsumoto
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Sayaka Hatano
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Ivana Antol
- Laboratory for Physical Organic Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Eiichi Kayahara
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Shigeru Yamago
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Manabu Abe
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
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Shibasaki Y, Suenobu T, Nakagawa T, Katoh R. Effect of Deuteration on Relaxation Dynamics of the Perylene Excimer Studied by Subnanosecond Transient Absorption Spectroscopy. J Phys Chem A 2021; 125:1359-1366. [PMID: 33541078 DOI: 10.1021/acs.jpca.0c10683] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We studied the effect of deuteration on the relaxation dynamics of the excimer of perylene in solution using subnanosecond time-resolved transient absorption spectroscopy based on the randomly interleaved pulse-train method. We found that the deuterated perylene excimer in solution had a longer lifetime than the undeuterated excimer but that deuteration had a little effect on the ground-state and transient absorption spectra of the excimer, suggesting that deuteration altered the relaxation dynamics by inducing small changes in vibrational properties. To confirm the origin of the deuteration effect, we quantitatively analyzed the kinetics of transient absorption decay, including the decay of triplet-triplet absorption. In addition, we evaluated the effects of temperature on the lifetime of the excimers. On the basis of these results, we concluded that the rate of internal conversion was suppressed by deuteration. By comparing our results with previously reported results on the effect of deuteration on the fluorescence properties of crystalline perylene, we proposed a model that may explain the effect of deuteration on the lifetime of the perylene excimer in solution.
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Affiliation(s)
- Yuuya Shibasaki
- College of Engineering, Nihon University, Koriyama, Fukushima 963-8642, Japan
| | - Tomoyoshi Suenobu
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | | | - Ryuzi Katoh
- College of Engineering, Nihon University, Koriyama, Fukushima 963-8642, Japan
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Sasaki M, Tran Bao Nguyen L, Yabumoto S, Nakagawa T, Abe M. Structural Transformation of the 2‐(
p
‐Aminophenyl)‐1‐hydroxyinden‐3‐ylmethyl Chromophore as a Photoremovable Protecting Group. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.202000149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Miyu Sasaki
- Department of Chemistry, Graduate School of Science Hiroshima University 1-3-1 Kagamiyama, Higashi-Hiroshima Hiroshima 739-8526 Japan
| | - Linh Tran Bao Nguyen
- Department of Chemistry, Graduate School of Science Hiroshima University 1-3-1 Kagamiyama, Higashi-Hiroshima Hiroshima 739-8526 Japan
| | | | | | - Manabu Abe
- Department of Chemistry, Graduate School of Science Hiroshima University 1-3-1 Kagamiyama, Higashi-Hiroshima Hiroshima 739-8526 Japan
- Hiroshima University Research Centre for Photo-Drug-Delivery Systems (HiU−P-DDS) Hiroshima University 1-3-1 Kagamiyama, Higashi-Hiroshima Hiroshima 739-8526 Japan
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Iwai R, Suzuki S, Sasaki S, Sairi AS, Igawa K, Suenobu T, Morokuma K, Konishi G. Bridged Stilbenes: AIEgens Designed via a Simple Strategy to Control the Non‐radiative Decay Pathway. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202000943] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Riki Iwai
- Department of Chemical Science and Engineering Tokyo Institute of Technology 2-12-1-H-134 O-okayama, Meguro-ku Tokyo 152-8552 Japan
| | - Satoshi Suzuki
- Fukui Institute for Fundamental Chemistry Kyoto University Takano-Nishibiraki-cho 34-4, Sakyou-ku Kyoto 606-8103 Japan
| | - Shunsuke Sasaki
- Université de Nantes CNRS Institut des Matériaux Jean Rouxel IMN F-44000 Nantes France
| | - Amir Sharidan Sairi
- Department of Chemical Science and Engineering Tokyo Institute of Technology 2-12-1-H-134 O-okayama, Meguro-ku Tokyo 152-8552 Japan
| | - Kazunobu Igawa
- Institute for Materials Chemistry and Engineering Kyushu University Fukuoka 816-8580 Japan
| | - Tomoyoshi Suenobu
- Division of Advanced Science and Biotechnology Osaka University 2-1 Yamada-oka, Suita Osaka 565 Japan
| | - Keiji Morokuma
- Fukui Institute for Fundamental Chemistry Kyoto University Takano-Nishibiraki-cho 34-4, Sakyou-ku Kyoto 606-8103 Japan
| | - Gen‐ichi Konishi
- Department of Chemical Science and Engineering Tokyo Institute of Technology 2-12-1-H-134 O-okayama, Meguro-ku Tokyo 152-8552 Japan
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Iwai R, Suzuki S, Sasaki S, Sairi AS, Igawa K, Suenobu T, Morokuma K, Konishi GI. Bridged Stilbenes: AIEgens Designed via a Simple Strategy to Control the Non-radiative Decay Pathway. Angew Chem Int Ed Engl 2020; 59:10566-10573. [PMID: 32119188 DOI: 10.1002/anie.202000943] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 02/19/2020] [Indexed: 12/18/2022]
Abstract
To broaden the application of aggregation-induced emission (AIE) luminogens (AIEgens), the design of novel small-molecular dyes that exhibit high fluorescence quantum yield (Φfl ) in the solid state is required. Considering that the mechanism of AIE can be rationalized based on steric avoidance of non-radiative decay pathways, a series of bridged stilbenes was designed, and their non-radiative decay pathways were investigated theoretically. Bridged stilbenes with short alkyl chains exhibited a strong fluorescence emission in solution and in the solid state, while bridged stilbenes with long alkyl chains exhibited AIE. Based on this theoretical prediction, we developed the bridged stilbenes BPST[7] and DPB[7], which demonstrate excellent AIE behavior.
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Affiliation(s)
- Riki Iwai
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1-H-134 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan
| | - Satoshi Suzuki
- Fukui Institute for Fundamental Chemistry, Kyoto University, Takano-Nishibiraki-cho 34-4, Sakyou-ku, Kyoto, 606-8103, Japan
| | - Shunsuke Sasaki
- Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, F-44000, Nantes, France
| | - Amir Sharidan Sairi
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1-H-134 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan
| | - Kazunobu Igawa
- Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, 816-8580, Japan
| | - Tomoyoshi Suenobu
- Division of Advanced Science and Biotechnology, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565, Japan
| | - Keiji Morokuma
- Fukui Institute for Fundamental Chemistry, Kyoto University, Takano-Nishibiraki-cho 34-4, Sakyou-ku, Kyoto, 606-8103, Japan
| | - Gen-Ichi Konishi
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1-H-134 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan
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