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Ito F, Naganawa R, Fujimoto Y, Takimoto M, Mochiduki Y, Katsumi S. Real-Time Fluorescence Visualization of Nanoparticle Aggregation and the Polymorph-Transition Process of a Mechanofluorochromic Difluoroboron-β-Diketone Derivative. Chemphyschem 2021; 22:1662-1666. [PMID: 34181311 DOI: 10.1002/cphc.202100370] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 06/11/2021] [Indexed: 12/16/2022]
Abstract
The use of organic nanomaterials in biomedical and optical devices has been widely studied. The key to improving the performance and stability of these devices is to control the fabrication process, which determines the phase stability and photophysical properties. In this study, fluorescence changes were observed during the reprecipitation process of mechanofluorochromic molecules of dibenzoyl(methanato)boron difluoride. The cyan-emission phase (C-phase) was first identified. The time evolution of the resolved fluorescence spectra revealed that the green-emission phase (G-phase) was formed from the amorphous phase with yellow emission via the C-phase, in addition to the direct formation of the G-phase. Combined with the results of the investigation into the thermal properties, the fluorescence changes clearly indicate a two-step nucleation process and Ostwald's rule of stages for polymorph transition, which enables us to not only provide guidance for controlling the fabrication process but also propose the ripening process for organic nanoparticle formation.
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Affiliation(s)
- Fuyuki Ito
- Department of Chemistry, Institution of Education, Shinshu University, 6-ro, Nishinagano, Nagano, 380-8544, Japan
| | - Ryuji Naganawa
- Department of Chemistry, Institution of Education, Shinshu University, 6-ro, Nishinagano, Nagano, 380-8544, Japan
| | - Yushi Fujimoto
- Department of Chemistry, Institution of Education, Shinshu University, 6-ro, Nishinagano, Nagano, 380-8544, Japan
| | - Maori Takimoto
- Department of Chemistry, Institution of Education, Shinshu University, 6-ro, Nishinagano, Nagano, 380-8544, Japan
| | - Yoshifumi Mochiduki
- Department of Chemistry, Institution of Education, Shinshu University, 6-ro, Nishinagano, Nagano, 380-8544, Japan
| | - Shiho Katsumi
- Graduate School of Science and Technology, Shinshu University, Institution 3-15-1, Tokida, Ueda, 386-8567, Japan
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Okada T, Miyamoto Y, Kurihara H, Mochiduki Y, Katsumi S, Ito F. Electronic interactions between a quaternary pyridyl-β-diketonate and anionic clay nanosheets facilitate intense photoluminescence. Photochem Photobiol Sci 2020; 19:1280-1288. [PMID: 32748926 DOI: 10.1039/d0pp00166j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Electrostatic interactions between a quaternary pyridyl-β-diketonate and anionic charged nanosheets were observed to produce a highly emissive dispersion in a rich water solution. A greater fluorescence quantum yield of approximately 50% was obtained when a luminogenic β-diketonate, 1-(4-methoxyphenyl)-3-(3-hydroxyethyl-pyridinium bromide)-1,3-propandione (prepared by the Claisen condensation reaction and subsequent quaternization), was molecularly dispersed and enclosed by a couple of atomically flat ultrathin (approximately 1.0 nm) silicate sheets of anionic layered clay. By accommodating β-diketonate into a narrow interlamellar space (approximately 0.4 nm distance), the molecular motion was suppressed, as confirmed by a smaller non-radiative relaxation rate constant, which was obtained by time-resolved luminescence and quantum yield measurements. Because the dense packing of β-diketonate quenched the excited state, the isolation of luminogens by the co-adsorption of photochemical inert cations (tetramethylammonium and benzylammonium) was prevented by concentration quenching. A lower quantum yield was obtained by expanding the interlayer distance above 1.0 nm by co-adsorbing a photo-inactive water-soluble polymer, poly(vinylpyrrolidone). Therefore, the fixation and spatial separation of β-diketonate in the narrow interlayer space was determined to be essential for obtaining strong emission.
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Affiliation(s)
- Tomohiko Okada
- Research Initiative for Supra-Materials, Shinshu University, Nagano 380-8553, Japan. and Department of Chemistry and Material Engineering, Shinshu University, Nagano 380-8553, Japan
| | - Yoko Miyamoto
- Department of Chemistry and Material Engineering, Shinshu University, Nagano 380-8553, Japan
| | - Haruka Kurihara
- Department of Chemistry and Material Engineering, Shinshu University, Nagano 380-8553, Japan
| | | | - Shiho Katsumi
- Institute of Education, Shinshu University, Nagano 380-8544, Japan
| | - Fuyuki Ito
- Institute of Education, Shinshu University, Nagano 380-8544, Japan
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Katsumi S, Sagawa T, Fukaminato T, Ito F. Assembling Structures of Diphenylalanine Linked with Dibenzoylmethanatoboron Difluoride Depending on the Solvent as Probed by Fluorescence Changes. CHEM LETT 2020. [DOI: 10.1246/cl.200215] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shiho Katsumi
- Graduate School of Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
| | - Takehiro Sagawa
- Department of Chemistry, Institute of Education, Shinshu University, 6-ro Nishinagano, Nagano 380-8544, Japan
| | - Tsuyoshi Fukaminato
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
| | - Fuyuki Ito
- Department of Chemistry, Institute of Education, Shinshu University, 6-ro Nishinagano, Nagano 380-8544, Japan
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Ikariko I, Hashimoto T, Kim S, Kurihara S, Ito F, Fukaminato T. Synthesis and fluorescence photoswitching of a diarylethene derivative having a dibenzoylmethanato boron difluoride complex. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152108] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Yang R, Hu Z, Li Y, Xia J, Ma J, Yang J. Spray coated perylenebisimide/polymer film with controllable molecular aggregation state and emission properties. RSC Adv 2020; 10:2437-2447. [PMID: 35496080 PMCID: PMC9048986 DOI: 10.1039/c9ra09950f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 01/02/2020] [Indexed: 11/29/2022] Open
Abstract
Dye doped organic thin films with controllable molecular aggregation and emission properties are of broad interest to the scientific community owing to their large number of potential applications in physics, chemistry, and materials science. Here, a spray coating method was used to prepare perylenebisimides (PBI) doped polymer films. In this study, the effects of the dye concentration, polymer matrix, solvent, and casting process on the optical properties of the resulting films were studied. The aggregation of the PBI into monomer, dimer, and oligomer forms, was rapidly and simply controlled based on the concentration dependence of PBI. The molecular aggregation mechanism in the film forming process for PBI doped polystyrene (PS) was further analyzed by computer simulations. The blends rapidly reached their lowest Gibbs free energy owing to the "frozen" polymer chains and confinement of PBI, molecules with different aggregation states. Therefore, the PBIs/PS films prepared under different conditions had different fluorescent lifetimes and absolute quantum yields. Narrow emission, amplified spontaneous emission (ASE) and random lasing (RL) were observed in PBI doped PS films when photo-pumped at 532 nm in transmittance and waveguide modes, respectively. A lower ASE and RL threshold were obtained for PS films doped with monomeric PBI than those in other aggregation states. Moreover, the solvent use in film deposition greatly influenced the emission properties of the PS films by altering their microstructures. These results indicate potential applications for spray coated dye/polymer films in organic solid-state lasers.
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Affiliation(s)
- Rui Yang
- State Key Laboratory of Environment-friendly Energy Materials, School of Material Science and Engineering, Southwest University of Science and Technology Mianyang 621010 China
| | - Zhijia Hu
- State Key Laboratory of Environment-friendly Energy Materials, School of Material Science and Engineering, Southwest University of Science and Technology Mianyang 621010 China
- School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology Hefei Anhui 230009 P. R. China
| | - Yaxin Li
- School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology Hefei Anhui 230009 P. R. China
| | - Jiangying Xia
- School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology Hefei Anhui 230009 P. R. China
| | - Jiajun Ma
- State Key Laboratory of Environment-friendly Energy Materials, School of Material Science and Engineering, Southwest University of Science and Technology Mianyang 621010 China
| | - Junxiao Yang
- State Key Laboratory of Environment-friendly Energy Materials, School of Material Science and Engineering, Southwest University of Science and Technology Mianyang 621010 China
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Lugovik KI, Eltyshev AK, Suntsova PO, Smoluk LT, Belousova AV, Ulitko MV, Minin AS, Slepukhin PA, Benassi E, Belskaya NP. Fluorescent boron complexes based on new N,O-chelates as promising candidates for flow cytometry. Org Biomol Chem 2019; 16:5150-5162. [PMID: 29963677 DOI: 10.1039/c8ob00868j] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This study presents the synthesis and optical properties of a new class of bright green-yellow fluorescent dyes with potential applications in bioimaging. A facile synthetic route via the chelation of aryl(hetaryl)aminoacryloylthiophene scaffolds with a BF2 fragment is presented. The photophysical properties of the dyes are attributed to the nature and position of electron-donating and electron-withdrawing substituents. Upon coordination to a BF2 fragment, characteristic emission was observed, with λem ranging from 503 to 543 nm and quantum yields of 0.14-0.42. Compared with parent aryl(hetaryl)aminoacryloylthiophenes, a significant red shift in absorption (up to 480 nm in solution) and emission (up to 543 nm in solution and 610 nm in the solid state) and high chemical stability and photostability were observed. The electron-accepting character of the substituents on the terminal aromatic ring or replacing this fragment with pyridine or pyrazine moieties resulted in increased quantum yields. To gain insight into the electronic structures and optical properties, quantum mechanical calculations were performed. The results of (TD-)DFT calculations supported the structural and spectroscopic data and showed the features of electronic distribution in the frontier molecular orbitals and active electrophilic and nucleophilic sites in the compounds investigated. Synthesized BF2 complexes are promising dyes for cell imaging and flow cytometry owing to their ready penetration and accumulation in cells.
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Affiliation(s)
- Kseniya I Lugovik
- Ural Federal University, 19 Mira Str., Yekaterinburg, 620002, Russian Federation.
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DeRosa CA, Daly ML, Kerr C, Fraser CL. Methoxy‐Substituted Difluoroboron Benzoylacetonate Complexes with Color‐Tunable Phosphorescence. CHEMPHOTOCHEM 2018. [DOI: 10.1002/cptc.201800156] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
| | - Margaret L. Daly
- Department of Chemistry University of Virginia Charlottesville, VA 22904 USA
| | - Caroline Kerr
- Department of Chemistry University of Virginia Charlottesville, VA 22904 USA
| | - Cassandra L. Fraser
- Department of Chemistry University of Virginia Charlottesville, VA 22904 USA
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Du Y, Feng Y, Yan H, Huang W, Yuan L, Bai L. Fluorescence emission from hyperbranched polycarbonate without conventional chromohpores. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.06.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Ito F, Yamamoto K, Kogasaka Y, Katoh R. Intermolecular Dynamics of Perylene in Polymer Matrices during the Drop-Casting Process Probed by Fluorescence and Droplet Mass Changes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:8281-8287. [PMID: 29909626 DOI: 10.1021/acs.langmuir.8b01342] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This work examines the drop-casting process of a perylene-doped polymer film by monitoring the changes in fluorescence and droplet mass. The mass is then used to estimate the mean intermolecular distance r( t) changes during the casting process. At a low perylene concentration (0.01 mol %), the fluorescence band was maintained during and after the casting process of poly(methyl methacrylate) (PMMA), whereas the r( t) values suggested that the perylene dimer does not form. With an increase in the perylene concentration in the casting droplet, significant fluorescence changes were observed at an r( t) value of ∼3.0 nm; this was comparable to the Förster distance between the monomers. Fluorescence changes were attributed to energy migration from the monomer to the small amount of dimer species formed by fluctuation in solution (e.g., amplified quenching). The monomer fluorescence band decreased according to second-order kinetics after the formation of the excimer fluorescence band by molecular association. Following the decrease in monomer emission due to association, the excimer emission originated from the excitation of both the monomer and ground-state dimer. Fluorescence spectral changes did not reveal any significant dependence of the casting process on the polymer matrices. The minor changes of the fluorescence spectra originated from the reabsorption and segregation of the perylene crystals in the films, depending on the polymers (PMMA, polystyrene, and Zeonex) employed. This was attributed to the intermolecular interaction between perylene and the polymer side chains. Real-time monitoring of the mean distance of the dye during the casting process can provide a suitable fabrication process for functional polymer films by the spin and drop-casting methods. Moreover, the intermolecular dynamics for molecular assembly and nucleation and growth of crystals can be elucidated by studying the fluorescence changes.
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Affiliation(s)
- Fuyuki Ito
- Department of Chemistry, Institute of Education , Shinshu University , 6-ro , Nishinagano , Nagano 380-8544 , Japan
| | - Kazuki Yamamoto
- Department of Chemistry, Institute of Education , Shinshu University , 6-ro , Nishinagano , Nagano 380-8544 , Japan
| | - Yoshiko Kogasaka
- Department of Chemistry, Institute of Education , Shinshu University , 6-ro , Nishinagano , Nagano 380-8544 , Japan
| | - Ryuzi Katoh
- Department of Chemical Biology and Applied Chemistry, College of Engineering , Nihon University , Koriyama , Fukushima 963-8642 , Japan
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Hirose M, Ito F, Shimada T, Takagi S, Sasai R, Okada T. Photoluminescence by Intercalation of a Fluorescent β-Diketone Dye into a Layered Silicate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13515-13521. [PMID: 29131640 DOI: 10.1021/acs.langmuir.7b03460] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A β-diketone dye was packed into the two-dimensional nanospace of a synthetic smectite (Sumecton SA), which is a cation-exchangeable layered silicate, to induce strong emission owing to molecular packing of the dye. An emissive dye, 1-(4-methoxyphenyl)-3-(4-pyridyl)-1,3-propandione, was prepared through a Claisen condensation reaction; the dye exhibited aggregation-induced emission, which is enhanced emission owing to clustering of molecules to form aggregates in poor solvents or in the solid state. The dye was nonemissive in solution. However, strong green emission was observed because of the restriction of molecular motion when the protonated dye was accommodated into the interlayer nanospace of the silicate layers through cation-exchange reactions. The restricted motion was confirmed by the smaller nonradiative relaxation rate constant obtained by time-resolved luminescence and quantum yield measurements. A moderate dye packing (0.11 mmol/g) in the interlayer space is important to obtain enhanced emission, whereas the intercalation of a large amount of dye (0.27 mmol/g) resulted in concentration quenching. Therefore, the interlayer space of the layered silicate used here was responsible for the strong emission because of moderate packing of the accommodated β-diketones.
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Affiliation(s)
- Mutsumi Hirose
- Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University , 4-17-1, Wakasato, Nagano 380-8553, Japan
| | - Fuyuki Ito
- Institution of Education, Shinshu University , 6-ro, Nishinagano, Nagano 380-8544, Japan
| | - Tetsuya Shimada
- Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University , 1-1, Minami-ohsawa, Hachiohji-shi, Tokyo 192-0397, Japan
| | - Shinsuke Takagi
- Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University , 1-1, Minami-ohsawa, Hachiohji-shi, Tokyo 192-0397, Japan
| | - Ryo Sasai
- Department of Physics and Materials Science, Interdisciplinary Graduate School of Science and Engineering, Shimane University , 1060 Nishikawatsu, 690-8504 Matsue, Japan
| | - Tomohiko Okada
- Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University , 4-17-1, Wakasato, Nagano 380-8553, Japan
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