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Fujii K, Aramaki M, Kimura Y. Excited-State Proton Transfer of 5,8-Dicyano-2-naphthol in High-Temperature and High-Pressure Methanol: Effect of Solvent Polarity and Hydrogen Bonding Ability. J Phys Chem B 2018; 122:12363-12374. [DOI: 10.1021/acs.jpcb.8b09235] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kaori Fujii
- Department of Applied Chemistry, Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Megumi Aramaki
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Yoshifumi Kimura
- Department of Applied Chemistry, Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
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2
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Fujii K, Yasaka Y, Ueno M, Koyanagi Y, Kasuga S, Matano Y, Kimura Y. Excited-State Proton Transfer of Cyanonaphthols in Protic Ionic Liquids: Appearance of a New Fluorescent Species. J Phys Chem B 2017; 121:6042-6049. [DOI: 10.1021/acs.jpcb.7b03658] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kaori Fujii
- Department
of Applied Chemistry, Graduate School of Science and Engineering and ‡Department of
Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
- Department of Fundamental Sciences,
Graduate School of Science and
Technology and ∥Department of Chemistry, Faculty of Science, Niigata University, Nishi-ku,
Niigata 950-2181, Japan
| | - Yoshiro Yasaka
- Department
of Applied Chemistry, Graduate School of Science and Engineering and ‡Department of
Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
- Department of Fundamental Sciences,
Graduate School of Science and
Technology and ∥Department of Chemistry, Faculty of Science, Niigata University, Nishi-ku,
Niigata 950-2181, Japan
| | - Masakatsu Ueno
- Department
of Applied Chemistry, Graduate School of Science and Engineering and ‡Department of
Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
- Department of Fundamental Sciences,
Graduate School of Science and
Technology and ∥Department of Chemistry, Faculty of Science, Niigata University, Nishi-ku,
Niigata 950-2181, Japan
| | - Yoshinari Koyanagi
- Department
of Applied Chemistry, Graduate School of Science and Engineering and ‡Department of
Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
- Department of Fundamental Sciences,
Graduate School of Science and
Technology and ∥Department of Chemistry, Faculty of Science, Niigata University, Nishi-ku,
Niigata 950-2181, Japan
| | - Sora Kasuga
- Department
of Applied Chemistry, Graduate School of Science and Engineering and ‡Department of
Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
- Department of Fundamental Sciences,
Graduate School of Science and
Technology and ∥Department of Chemistry, Faculty of Science, Niigata University, Nishi-ku,
Niigata 950-2181, Japan
| | - Yoshihiro Matano
- Department
of Applied Chemistry, Graduate School of Science and Engineering and ‡Department of
Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
- Department of Fundamental Sciences,
Graduate School of Science and
Technology and ∥Department of Chemistry, Faculty of Science, Niigata University, Nishi-ku,
Niigata 950-2181, Japan
| | - Yoshifumi Kimura
- Department
of Applied Chemistry, Graduate School of Science and Engineering and ‡Department of
Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
- Department of Fundamental Sciences,
Graduate School of Science and
Technology and ∥Department of Chemistry, Faculty of Science, Niigata University, Nishi-ku,
Niigata 950-2181, Japan
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3
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Simkovitch R, Huppert D. Excited-state proton transfer of weak photoacids adsorbed on biomaterials: proton transfer to glucosamine of chitosan. J Phys Chem A 2015; 119:641-51. [PMID: 25556376 DOI: 10.1021/jp511349j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
UV-vis steady-state and time-resolved techniques were employed to study the excited-state proton-transfer process from two weak photoacids positioned next to the surface of chitosan and cellulose. Both chitosan and cellulose are linear polysaccharides; chitosan is composed mainly of d-glucosamine units. In order to overcome the problem of the high basicity of the glucosamine, we chose 2-naphthol (pKa* ≈ 2.7) and 2-naphthol-6-sulfonate (pKa* ≈ 1.7) as the proton emitters because of their ground state pKa (≈9). Next to the 1:1 cellulose:water weight ratio, the ESPT rate of these photoacids is comparable to that of bulk water. We found that the ESPT rate of 2-naphthol (2NP) and 2-naphthol-6-sulfonate (2N6S) next to chitosan in water (1:1) weight ratio samples is higher than in bulk water by a factor of about 5 and 2, respectively. We also found an efficient ESPT process that takes place from these photoacids in the methanol environment next to the chitosan scaffold, whereas ESPT is not observed in methanolic bulk solutions of these photoacids. We therefore conclude that ESPT occurs from these photoacids to the d-glucosamine units that make up chitosan.
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Affiliation(s)
- Ron Simkovitch
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University , Tel Aviv 69978, Israel
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5
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Kobayashi I, Terazima M, Kimura Y. Study of the excited-state proton-transfer reaction of 5-cyano-2-naphthol in sub- and supercritical water. J Phys Chem B 2012; 116:1043-52. [PMID: 22201510 DOI: 10.1021/jp2097422] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The excited-state proton-transfer (ESPT) reaction of 5-cyano-2-naphthol (5CN2) has been investigated in sub- and supercritical water using time-resolved fluorescence measurements. Under ambient conditions, a very fast decay of the fluorescence from the excited state of normal 5CN2 (ROH*) and a simultaneous increase of the fluorescence from the excited state of the anion species (RO(-)*) were observed, as reported previously. The very high ESPT rate was evaluated as 0.12 ps(-1). With increasing temperature at a constant pressure of 39.0 MPa, the proton transfer became slow. At 615 K and 39.0 MPa, another fluorescence from a new unknown chemical species appeared, which was assigned to the contact ion pair (CIP) of RO(-)* and the hydronium ion. With decreasing pressure at 664 K, the fluorescence from RO(-)* disappeared, and the fluorescence from ROH* and CIP was observed. At the very low density of supercritical water, only the fluorescence decay of ROH* was detected. The reaction dynamics was analyzed with the help of singular value decomposition and spectral decomposition using model functions. The ESPT rate was correlated with the solvent dielectric constant and/or the hydrogen-bonding ability.
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Affiliation(s)
- I Kobayashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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6
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Amdursky N, Gepshtein R, Erez Y, Koifman N, Huppert D. Pressure Effect on the Nonradiative Process of Thioflavin-T. J Phys Chem A 2011; 115:6481-7. [DOI: 10.1021/jp201537k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Nadav Amdursky
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, ‡Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Rinat Gepshtein
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, ‡Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Yuval Erez
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, ‡Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Naum Koifman
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, ‡Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Dan Huppert
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, ‡Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
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Genosar L, Lasitza T, Gepshtein R, Leiderman P, Koifman N, Huppert D. Effect of Pressure on the Proton Transfer Rate from a Photoacid to a Solvent. 4. Photoacids in Methanol. J Phys Chem A 2005; 109:4852-61. [PMID: 16833830 DOI: 10.1021/jp050926z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The pressure dependence of the excited-state proton dissociation rate constant of four photoacids, 2-naphthol-6,8-disulfonate (2N68DS), 10-hydroxycamptothecin (10-CPT), 5-cyano-2-naphthol (5CN2), and 5,8-dicyano-2-naphthol (DCN2), are studied in methanol. The results are compared with the results of the pressure dependence study we recently conducted for several photoacids in water, ethanol, and propanol. The pressure dependence is explained using an approximate stepwise two-coordinate proton transfer model. The increase in rate, as a function of pressure, manifests a strong dependence of proton tunneling on the distance which decreases with an increase of pressure between the two oxygen atoms involved in the process. The decrease in the proton transfer rate with increasing pressure reflects the dependence of the reaction on the solvent relaxation rate. We found that, for the relatively weak photoacids 2N68DS, 10-CPT, and 5CN2, the proton transfer rate constant increases by a factor of about 5-8 at a pressure of about 1.5 GPa. For a strong photoacid like DCN2, the rate increase was only by a factor of 2.
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Affiliation(s)
- Liat Genosar
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
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9
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Genosar L, Leiderman P, Koifman N, Huppert D. Effect of Pressure on Proton Transfer Rate from a Photoacid to a Solvent. 3. 2-Naphthol and 2-Naphthol Monosulfonate Derivatives in Water. J Phys Chem A 2004. [DOI: 10.1021/jp0310910] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Liat Genosar
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Pavel Leiderman
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Nahum Koifman
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Dan Huppert
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
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