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Hamasaki A, Kubo K, Harashima M, Katsuki A, Ozeki S. Reversible Change between Excimer and Monomer Forms of Perylene Induced by Water Absorption and Dehydration of Poly- N-isopropylacrylamide Gel. J Phys Chem B 2021; 125:2987-2993. [PMID: 33724819 DOI: 10.1021/acs.jpcb.0c11418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Several fluorescence patterns derived from the excimer states of perylene have been reported, but most of these have been obtained from rigid forms such as crystals or for perylene embedded in hard polymers. We observed perylene excimer emission on absorption of water by a poly-N-isopropylacrylamide gel containing perylene molecules, which were not fixed to the gel framework by chemical bonding. We propose that this emission arises because the hydrophobic perylene molecules cannot dissolve in water and form aggregates. The perylene aggregation was quickly lost on dehydration of the gel, and the luminescence reverted to that of the monomer. In a dehydrated environment, perylene was rapidly dispersed in the gel network. In other words, solid-liquid phase separation of perylene was induced by uptake of water into the gel, and perylene dissolved in the gel on dehydration. Because the outside of the gel is always in an aqueous environment, perylene will remain semipermanently in the gel. Therefore, monomer emission and excimer emission can be switched reversibly and repeatedly.
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Affiliation(s)
- Atom Hamasaki
- Faculty of Science, Shinshu University, Matsumoto, Nagano 390-8621, Japan
| | - Kei Kubo
- Faculty of Science, Shinshu University, Matsumoto, Nagano 390-8621, Japan
| | - Miki Harashima
- Faculty of Science, Shinshu University, Matsumoto, Nagano 390-8621, Japan
| | - Akio Katsuki
- School of General Education, Shinshu University, Matsumoto, Nagano 390-8621, Japan
| | - Sumio Ozeki
- Faculty of Science, Shinshu University, Matsumoto, Nagano 390-8621, Japan
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Tanaka M, Yago T, Wakasa M. Local structure of ionic liquids probed by self-quenching of thiobenzophenone. Phys Chem Chem Phys 2013. [DOI: 10.1039/c2cp42766d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Okada T, Yago T, Takamasu T, Wakasa M. Cage lifetimes of ionic liquids as studied by the magnetic field effect probe. Phys Chem Chem Phys 2012; 14:3490-7. [DOI: 10.1039/c2cp23747d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Tanaka M, Yago T, Sakaguchi Y, Takamasu T, Wakasa M. Magnetic Field Effects on Hydrogen Abstraction of Thiobenzophenone as a Probe of Microviscosity. J Phys Chem B 2011; 115:1936-43. [DOI: 10.1021/jp108898a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miyuki Tanaka
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
| | - Tomoaki Yago
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
| | - Yoshio Sakaguchi
- RIKEN (The Institute of Physical and Chemical Research), 2-1Wako, Wako-shi, Saitama 351-0198, Japan
| | - Tadashi Takamasu
- National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
| | - Masanobu Wakasa
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
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Hamasaki A, Yago T, Wakasa M. Magnetic Field Effect on a Radical Pair Reaction as a Probe of Microviscosity. J Phys Chem B 2008; 112:14185-92. [DOI: 10.1021/jp804862w] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Atom Hamasaki
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubu, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
| | - Tomoaki Yago
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubu, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
| | - Masanobu Wakasa
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubu, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
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Hamasaki A, Yago T, Takamasu T, Kido G, Wakasa M. Anomalous Magnetic Field Effects on Photochemical Reactions in Ionic Liquid under Ultrahigh Fields of up to 28 T. J Phys Chem B 2008; 112:3375-9. [DOI: 10.1021/jp710047c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Atom Hamasaki
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan, and National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
| | - Tomoaki Yago
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan, and National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
| | - Tadashi Takamasu
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan, and National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
| | - Giyuu Kido
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan, and National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
| | - Masanobu Wakasa
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan, and National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
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Wakasa M. The Magnetic Field Effects on Photochemical Reactions in Ionic Liquids. J Phys Chem B 2007; 111:9434-6. [PMID: 17658797 DOI: 10.1021/jp074331a] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The magnetic field effects (MFEs) on photoinduced hydrogen abstraction reactions of benzophenone (BP) with thiophenol (PhSH) in the ionic liquids (ILs) N,N,N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl) imide (TMPA TFSI), N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl) imide (P13 TFSI), and N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl) imide (PP13 TFSI) were investigated at 296 K by using a nanosecond laser flash photolysis technique under magnetic fields of 0-1.7 T. Large MFEs were observed for the first time in the ILs. In TMPA TFSI, the yield of the benzophenone ketyl radical gradually decreased with increasing magnetic field strength from 0 to 1.7 T, producing a 20% decrease at 1.7 T.
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