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Shinsuke Takagi - One of the best experts on this subject based on the ideXlab platform.

  • active species transfer type artificial Light Harvesting System in the nanosheet dye complexes utilization of longer wavelength region of sunLight
    Tetrahedron Letters, 2018
    Co-Authors: Shunpei Suzuki, Tetsuya Shimada, Daichi Tatsumi, Takamasa Tsukamoto, Ryou Honna, Haruo Inoue, Shinsuke Takagi
    Abstract:

    Abstract A novel Light Harvesting System that captures long-wavelength Light of sunLight by the use of hole transfer was newly investigated. Ga phthalocyanine(GaIIITMAPc4+(D)) and Ru porphyrin(RuIIDMPyMP2+(A)) co-adsorbed reaction System on the synthetic nanosheet was examined as an artificial Light Harvesting System. By irradiating 660 nm Light, where GaIIITMAPc4+(D) absorbs, to the System under a presence of PtCl62− as an electron acceptor, cation radical of RuIIDMPyMP2+(A) was produced despite that Ru porphyrin adsorbs only 413 and 533 nm Light. The efficient hole transfer reaction from GaIIITMAPc4+(D)+ , that is generated from its excited state, to RuIIDMPyMP2+(A) takes place on the nanosheet.

  • Active species transfer-type artificial Light Harvesting System in the nanosheet – Dye complexes: Utilization of longer wavelength region of sunLight
    Tetrahedron Letters, 2018
    Co-Authors: Shunpei Suzuki, Tetsuya Shimada, Daichi Tatsumi, Takamasa Tsukamoto, Ryou Honna, Haruo Inoue, Shinsuke Takagi
    Abstract:

    Abstract A novel Light Harvesting System that captures long-wavelength Light of sunLight by the use of hole transfer was newly investigated. Ga phthalocyanine(GaIIITMAPc4+(D)) and Ru porphyrin(RuIIDMPyMP2+(A)) co-adsorbed reaction System on the synthetic nanosheet was examined as an artificial Light Harvesting System. By irradiating 660 nm Light, where GaIIITMAPc4+(D) absorbs, to the System under a presence of PtCl62− as an electron acceptor, cation radical of RuIIDMPyMP2+(A) was produced despite that Ru porphyrin adsorbs only 413 and 533 nm Light. The efficient hole transfer reaction from GaIIITMAPc4+(D)+ , that is generated from its excited state, to RuIIDMPyMP2+(A) takes place on the nanosheet.

  • Energy Transfer among Three Dye Components in a Nanosheet–Dye Complex: An Approach To Evaluating the Performance of a Light-Harvesting System
    The Journal of Physical Chemistry C, 2017
    Co-Authors: Yuta Ohtani, Tetsuya Shimada, Shintaro Kawaguchi, Shinsuke Takagi
    Abstract:

    Energy transfer among three dye components, namely, p-2,4,5,7-tetrakis(N-methylpyridinium-4-yl)-6-potassium-oxy-3-fluorone (Fluorone), meso-tetra(N-methyl-3-pyridyl) porphine (m-TMPyP), and meso-tetra(N-methyl-4-pyridyl)porphine (p-TMPyP), was investigated for the purpose of utilizing a wide range of sunLight wavelengths for clay nanosheets. In this paper, we define a new parameter, the enhancement ratio of the excitation frequency (Γ380–780 nm) of the dye, in order to comprehensively represent the performance of the Light-Harvesting System (LHS). Γ380–780 nm is defined as the enhancement ratio of the excitation frequency of dye that has the lowest excitation energy in the System (p-TMPyP in this System) in terms of the frequency of p-TMPyP without the use of Light-Harvesting dyes (Fluorone and m-TMPyP), when the visible-Light region of sunLight (380–780 nm) is used for irradiation Light. Γ380–780 nm was calculated from the absorption spectra of dyes, the results of energy transfer experiments, and the su...

  • energy transfer among three dye components in a nanosheet dye complex an approach to evaluating the performance of a Light Harvesting System
    Journal of Physical Chemistry C, 2017
    Co-Authors: Yuta Ohtani, Tetsuya Shimada, Shintaro Kawaguchi, Shinsuke Takagi
    Abstract:

    Energy transfer among three dye components, namely, p-2,4,5,7-tetrakis(N-methylpyridinium-4-yl)-6-potassium-oxy-3-fluorone (Fluorone), meso-tetra(N-methyl-3-pyridyl) porphine (m-TMPyP), and meso-tetra(N-methyl-4-pyridyl)porphine (p-TMPyP), was investigated for the purpose of utilizing a wide range of sunLight wavelengths for clay nanosheets. In this paper, we define a new parameter, the enhancement ratio of the excitation frequency (Γ380–780 nm) of the dye, in order to comprehensively represent the performance of the Light-Harvesting System (LHS). Γ380–780 nm is defined as the enhancement ratio of the excitation frequency of dye that has the lowest excitation energy in the System (p-TMPyP in this System) in terms of the frequency of p-TMPyP without the use of Light-Harvesting dyes (Fluorone and m-TMPyP), when the visible-Light region of sunLight (380–780 nm) is used for irradiation Light. Γ380–780 nm was calculated from the absorption spectra of dyes, the results of energy transfer experiments, and the su...

  • Artificial Light-Harvesting System with Energy Migration Functionality in a Cationic Dye/Inorganic Nanosheet Complex
    The Journal of Physical Chemistry C, 2015
    Co-Authors: Yuta Ohtani, Tetsuya Shimada, Shinsuke Takagi
    Abstract:

    We investigated a reaction involving photochemical energy transfer between a cationic xanthene derivative (Flu(D)) and a cationic porphyrin (Por(A)) with an energy migration functionality, which is crucial for efficient Light-Harvesting on an inorganic nanosheet. Efficient energy transfer from excited Flu(D) to Por(A) took place, and the maximum energy transfer efficiency was 99%. Even under Light-Harvesting conditions, Por(A) concentration was much less than Flu(D) concentration (Flu(D)/Por(A) concentration ratio = 15), and the energy transfer efficiency was still 80%. Steady-state, time-resolved, anisotropic fluorescence measurements indicate energy migration between Flu(D) molecules. This System has the functionality of a Light-Harvesting System using a dye and having a large overlap between its absorption and fluorescence spectra.

Leyong Wang - One of the best experts on this subject based on the ideXlab platform.

  • a supramolecular artificial Light Harvesting System with two step sequential energy transfer for photochemical catalysis
    Angewandte Chemie, 2020
    Co-Authors: Min Hao, Guangping Sun, Minzan Zuo, Yuan Chen, Leyong Wang
    Abstract:

    An artificial Light-Harvesting System with sequential energy-transfer process was fabricated based on a supramolecular strategy. Self-assembled from the host-guest complex formed by water-soluble pillar[5]arene (WP5), a bola-type tetraphenylethylene-functionalized dialkyl ammonium derivative (TPEDA), and two fluorescent dyes, Eosin Y (ESY) and Nile Red (NiR), the supramolecular vesicles achieve efficient energy transfer from the AIE guest TPEDA to ESY. ESY can function as a relay to further transfer the energy to the second acceptor NiR and realize a two-step sequential energy-transfer process with good efficiency. By tuning the donor/acceptor ratio, bright white Light emission can be successfully achieved with a CIE coordinate of (0.33, 0.33). To better mimic natural photosynthesis and make full use of the harvested energy, the WP5⊃TPEDA-ESY-NiR System can be utilized as a nanoreactor: photocatalyzed dehalogenation of α-bromoacetophenone was realized with 96 % yield in aqueous medium.

  • A highly efficient artificial Light-Harvesting System with two-step sequential energy transfer based on supramolecular self-assembly
    Journal of Materials Chemistry A, 2020
    Co-Authors: Guangping Sun, Weirui Qian, Jianmin Jiao, Tingting Han, Yukun Shi, Leyong Wang
    Abstract:

    A highly efficient artificial Light-Harvesting System (ALHS) in the aqueous phase with a two-step sequential energy transfer process has been successfully constructed based on the host–guest interaction between a water-soluble pillar[5]arene (WP5) and a bola-type bis(4-phenyl)acrylonitrile derivative (BPT), as well as two different hydrophobic fluorescent dyes (4,7-bis(thien-2-yl)-2,1,3-benzothiadiazole (DBT) and Nile Red (NiR)). The fabricated ALHS shows an ultrahigh antenna effect (47.8 for the first step and 20.1 for the second step) with a high donor/acceptor ratio of 350 : 1. It is noted that the obtained WP5⊃BPT supramolecular nanoparticles possess an enhanced aggregation-induced emission (AIE) effect and can function as an ideal donor to realize the first-step of energy transfer from the WP5⊃BPT assembly to DBT. Moreover, inspired by the sequential energy transfer in nature, NiR was carefully selected as the second acceptor to fabricate an efficient two-step sequential Light-Harvesting System based on the WP5⊃BPT–DBT–NiR assembly, which exhibits a high FRET efficiency of 60.9% and 89.4% for the two-step sequential energy transfer process, respectively. Notably, the emission color changed from Light blue to bright green and then to bright red during this process, and thus by tuning the molar ratio of DBT and NiR, a bright white Light emission can be achieved with a high fluorescence quantum yield of 23.5%, which showed a strong ability for white fluorescence emission and promising applications in visible-Light photocatalysis.

  • A Supramolecular Artificial Light‐Harvesting System with Two‐step Sequential Energy Transfer for Photochemical Catalysis
    Angewandte Chemie (International ed. in English), 2019
    Co-Authors: Min Hao, Guangping Sun, Minzan Zuo, Yuan Chen, Leyong Wang
    Abstract:

    An artificial Light-Harvesting System with sequential energy-transfer process was fabricated based on a supramolecular strategy. Self-assembled from the host-guest complex formed by water-soluble pillar[5]arene (WP5), a bola-type tetraphenylethylene-functionalized dialkyl ammonium derivative (TPEDA), and two fluorescent dyes, Eosin Y (ESY) and Nile Red (NiR), the supramolecular vesicles achieve efficient energy transfer from the AIE guest TPEDA to ESY. ESY can function as a relay to further transfer the energy to the second acceptor NiR and realize a two-step sequential energy-transfer process with good efficiency. By tuning the donor/acceptor ratio, bright white Light emission can be successfully achieved with a CIE coordinate of (0.33, 0.33). To better mimic natural photosynthesis and make full use of the harvested energy, the WP5⊃TPEDA-ESY-NiR System can be utilized as a nanoreactor: photocatalyzed dehalogenation of α-bromoacetophenone was realized with 96 % yield in aqueous medium.

  • Highly Efficient Artificial Light-Harvesting Systems Constructed in Aqueous Solution Based on Supramolecular Self-Assembly.
    Angewandte Chemie (International ed. in English), 2018
    Co-Authors: Shuwen Guo, Yongshang Song, Leyong Wang
    Abstract:

    Highly efficient Light-Harvesting Systems were successfully fabricated in aqueous solution based on the supramolecular self-assembly of a water-soluble pillar[6]arene (WP6), a salicylaldehyde azine derivative (G), and two different fluorescence dyes, Nile Red (NiR) or Eosin Y (ESY). The WP6-G supramolecular assembly exhibits remarkably improved aggregation-induced emission enhancement and acts as a donor for the artificial Light-Harvesting System, and NiR or ESY, which are loaded within the WP6-G assembly, act as acceptors. An efficient energy-transfer process takes place from the WP6-G assembly not only to NiR but also to ESY for these two different Systems. Furthermore, both of the WP6-G-NiR and WP6-G-ESY Systems show an ultrahigh antenna effect at a high donor/acceptor ratio.

  • FRET-capable supramolecular polymers based on a BODIPY-bridged pillar[5]arene dimer with BODIPY guests for mimicking the Light-Harvesting System of natural photosynthesis.
    Chemical communications (Cambridge England), 2015
    Co-Authors: Lu-bo Meng, Shuhan Xiong, Leyong Wang
    Abstract:

    AA/BB-type and A2/B3-type FRET-capable supramolecular polymers based on a BODIPY-bridged pillar[5]arene dimer and two BODIPY derivative guests have been successfully constructed and their application in mimicking the Light-Harvesting System of natural photosynthesis was studied.

Tetsuya Shimada - One of the best experts on this subject based on the ideXlab platform.

  • active species transfer type artificial Light Harvesting System in the nanosheet dye complexes utilization of longer wavelength region of sunLight
    Tetrahedron Letters, 2018
    Co-Authors: Shunpei Suzuki, Tetsuya Shimada, Daichi Tatsumi, Takamasa Tsukamoto, Ryou Honna, Haruo Inoue, Shinsuke Takagi
    Abstract:

    Abstract A novel Light Harvesting System that captures long-wavelength Light of sunLight by the use of hole transfer was newly investigated. Ga phthalocyanine(GaIIITMAPc4+(D)) and Ru porphyrin(RuIIDMPyMP2+(A)) co-adsorbed reaction System on the synthetic nanosheet was examined as an artificial Light Harvesting System. By irradiating 660 nm Light, where GaIIITMAPc4+(D) absorbs, to the System under a presence of PtCl62− as an electron acceptor, cation radical of RuIIDMPyMP2+(A) was produced despite that Ru porphyrin adsorbs only 413 and 533 nm Light. The efficient hole transfer reaction from GaIIITMAPc4+(D)+ , that is generated from its excited state, to RuIIDMPyMP2+(A) takes place on the nanosheet.

  • Active species transfer-type artificial Light Harvesting System in the nanosheet – Dye complexes: Utilization of longer wavelength region of sunLight
    Tetrahedron Letters, 2018
    Co-Authors: Shunpei Suzuki, Tetsuya Shimada, Daichi Tatsumi, Takamasa Tsukamoto, Ryou Honna, Haruo Inoue, Shinsuke Takagi
    Abstract:

    Abstract A novel Light Harvesting System that captures long-wavelength Light of sunLight by the use of hole transfer was newly investigated. Ga phthalocyanine(GaIIITMAPc4+(D)) and Ru porphyrin(RuIIDMPyMP2+(A)) co-adsorbed reaction System on the synthetic nanosheet was examined as an artificial Light Harvesting System. By irradiating 660 nm Light, where GaIIITMAPc4+(D) absorbs, to the System under a presence of PtCl62− as an electron acceptor, cation radical of RuIIDMPyMP2+(A) was produced despite that Ru porphyrin adsorbs only 413 and 533 nm Light. The efficient hole transfer reaction from GaIIITMAPc4+(D)+ , that is generated from its excited state, to RuIIDMPyMP2+(A) takes place on the nanosheet.

  • Energy Transfer among Three Dye Components in a Nanosheet–Dye Complex: An Approach To Evaluating the Performance of a Light-Harvesting System
    The Journal of Physical Chemistry C, 2017
    Co-Authors: Yuta Ohtani, Tetsuya Shimada, Shintaro Kawaguchi, Shinsuke Takagi
    Abstract:

    Energy transfer among three dye components, namely, p-2,4,5,7-tetrakis(N-methylpyridinium-4-yl)-6-potassium-oxy-3-fluorone (Fluorone), meso-tetra(N-methyl-3-pyridyl) porphine (m-TMPyP), and meso-tetra(N-methyl-4-pyridyl)porphine (p-TMPyP), was investigated for the purpose of utilizing a wide range of sunLight wavelengths for clay nanosheets. In this paper, we define a new parameter, the enhancement ratio of the excitation frequency (Γ380–780 nm) of the dye, in order to comprehensively represent the performance of the Light-Harvesting System (LHS). Γ380–780 nm is defined as the enhancement ratio of the excitation frequency of dye that has the lowest excitation energy in the System (p-TMPyP in this System) in terms of the frequency of p-TMPyP without the use of Light-Harvesting dyes (Fluorone and m-TMPyP), when the visible-Light region of sunLight (380–780 nm) is used for irradiation Light. Γ380–780 nm was calculated from the absorption spectra of dyes, the results of energy transfer experiments, and the su...

  • energy transfer among three dye components in a nanosheet dye complex an approach to evaluating the performance of a Light Harvesting System
    Journal of Physical Chemistry C, 2017
    Co-Authors: Yuta Ohtani, Tetsuya Shimada, Shintaro Kawaguchi, Shinsuke Takagi
    Abstract:

    Energy transfer among three dye components, namely, p-2,4,5,7-tetrakis(N-methylpyridinium-4-yl)-6-potassium-oxy-3-fluorone (Fluorone), meso-tetra(N-methyl-3-pyridyl) porphine (m-TMPyP), and meso-tetra(N-methyl-4-pyridyl)porphine (p-TMPyP), was investigated for the purpose of utilizing a wide range of sunLight wavelengths for clay nanosheets. In this paper, we define a new parameter, the enhancement ratio of the excitation frequency (Γ380–780 nm) of the dye, in order to comprehensively represent the performance of the Light-Harvesting System (LHS). Γ380–780 nm is defined as the enhancement ratio of the excitation frequency of dye that has the lowest excitation energy in the System (p-TMPyP in this System) in terms of the frequency of p-TMPyP without the use of Light-Harvesting dyes (Fluorone and m-TMPyP), when the visible-Light region of sunLight (380–780 nm) is used for irradiation Light. Γ380–780 nm was calculated from the absorption spectra of dyes, the results of energy transfer experiments, and the su...

  • Artificial Light-Harvesting System with Energy Migration Functionality in a Cationic Dye/Inorganic Nanosheet Complex
    The Journal of Physical Chemistry C, 2015
    Co-Authors: Yuta Ohtani, Tetsuya Shimada, Shinsuke Takagi
    Abstract:

    We investigated a reaction involving photochemical energy transfer between a cationic xanthene derivative (Flu(D)) and a cationic porphyrin (Por(A)) with an energy migration functionality, which is crucial for efficient Light-Harvesting on an inorganic nanosheet. Efficient energy transfer from excited Flu(D) to Por(A) took place, and the maximum energy transfer efficiency was 99%. Even under Light-Harvesting conditions, Por(A) concentration was much less than Flu(D) concentration (Flu(D)/Por(A) concentration ratio = 15), and the energy transfer efficiency was still 80%. Steady-state, time-resolved, anisotropic fluorescence measurements indicate energy migration between Flu(D) molecules. This System has the functionality of a Light-Harvesting System using a dye and having a large overlap between its absorption and fluorescence spectra.

Amitava Patra - One of the best experts on this subject based on the ideXlab platform.

  • Ultrafast Energy Flow Dynamics in a Conjugated Polymer-Based Host–Guest Light-Harvesting System
    The Journal of Physical Chemistry C, 2019
    Co-Authors: Srijon Ghosh, Bikash Jana, Arnab Ghosh, Amitava Patra
    Abstract:

    Conjugated polymer-based Light-Harvesting Systems have been the subject of research because of their multichromophoric property. Here, we mainly emphasize on the ultrafast relaxation dynamics of poly [9,9-dioctylfluorene-alt-benzothiadiazole] (F8BT) polymer nanoparticles (PNPs) at various time scales, and the time scales of energy funneling from PNPs to encapsulated Nile Red (NR) dye are estimated using global and target analysis of the transient absorption data matrix. The red shift in ground-state bleaching of evolution-associated difference spectrum (EADS) indicates the formation of the collective delocalized state (CLs) in PNPs. It is to be noted that the life times of three excited states of PNPs (S1Hot, S1, and CLS) are found to be decreased after encapsulation of the acceptor dye, and it is evident that the energy transfer occurs from these three excited states of PNPs to the dye. Further, the concomitant decay component (8.1 ps) of the donor and the rise time (8.3 ps) of the acceptor confirm the e...

  • ultrafast energy flow dynamics in a conjugated polymer based host guest Light Harvesting System
    Journal of Physical Chemistry C, 2019
    Co-Authors: Srijon Ghosh, Bikash Jana, Arnab Ghosh, Amitava Patra
    Abstract:

    Conjugated polymer-based Light-Harvesting Systems have been the subject of research because of their multichromophoric property. Here, we mainly emphasize on the ultrafast relaxation dynamics of poly [9,9-dioctylfluorene-alt-benzothiadiazole] (F8BT) polymer nanoparticles (PNPs) at various time scales, and the time scales of energy funneling from PNPs to encapsulated Nile Red (NR) dye are estimated using global and target analysis of the transient absorption data matrix. The red shift in ground-state bleaching of evolution-associated difference spectrum (EADS) indicates the formation of the collective delocalized state (CLs) in PNPs. It is to be noted that the life times of three excited states of PNPs (S1Hot, S1, and CLS) are found to be decreased after encapsulation of the acceptor dye, and it is evident that the energy transfer occurs from these three excited states of PNPs to the dye. Further, the concomitant decay component (8.1 ps) of the donor and the rise time (8.3 ps) of the acceptor confirm the e...

  • Ultrafast Energy Transfer Followed by Electron Transfer in a Polymeric Nanoantenna-Based Light Harvesting System
    The Journal of Physical Chemistry C, 2018
    Co-Authors: Bikash Jana, Amitava Patra
    Abstract:

    A polymeric nanoantenna-based Light Harvesting System is prospective because of it captures more number of photons by a multichromophoric donor and subsequently transfers its energy to the acceptor. Here, we have designed an aqueous solution-based polymeric nanoantenna, where conjugated polymer nanoparticles (donor) are attached with Au nanoparticle-capped porphyrin (acceptor)-encapsulated bovine serum albumin protein for both energy transfer and electron transfer processes. Ultrafast fluorescence upconversion and transient absorption spectroscopic studies reveal that the ultrafast energy transfer occurs from the conjugated polymer nanoparticle to porphyrin in 130 fs, followed by the electron transfer from porphyrin to Au nanoparticles in 70 ps after photoexcitation. Furthermore, the antenna effect of this Light Harvesting System is found to be 79 at the donor to acceptor ratio of 16:1. Analysis reveals that this polymeric nanoantenna opens up a new avenue for designing a highly efficient aqueous solution...

  • Nano-bio assemblies for artificial Light Harvesting Systems
    Colloidal Nanoparticles for Biomedical Applications XIII, 2018
    Co-Authors: Dipankar Bain, Subarna Maity, Amitava Patra
    Abstract:

    Ultrasmall fluorescent gold nanoclusters (Au NCs) have drawn considerable research interest owing to their molecular like properties such as d-sp and sp-sp transitions, and intense fluorescence. Fluorescent Au NCs have especial attraction in biological System owing to their biocompatibility and high photostability. Recently, several strategies have been adapted to design an artificial Light-Harvesting System using Au NCs for potential applications. Here, we have designed Au nanoclusters based dsDNA (double stranded deoxyribonucleic acid) nano assemblies where the Au nanocluster is covalently attached with Alexa Fluor 488 (A488) dye tagged dsDNA. Investigation reveals that the incorporation of Ag+ into dsDNA enhances the rate of energy transfer from A488 to Au NCs. In addition cadmium telluride quantum dot (CdTe QDs) based Au NCs hybrid material shows the significant enhancement of energy transfer 35% to 83% with changing the capping ligand of Au NCs from glutathione (GSH) to bovine serum albumin (BSA) protein. Another hybrid System is developed using carbon dots and dye encapsulated BSA-protein capped Au NCs for efficient Light Harvesting System with 83% energy transfer efficiency. Thus, Au NCs base nano bio assemblies may open up new possibilities for the construction of artificial Light Harvesting System.

  • Ultrafast Energy Transfer Followed by Electron Transfer in a Polymeric Nanoantenna-Based Light Harvesting System C
    The Journal of Physical Chemistry, 2018
    Co-Authors: Bikash Jana, Amitava Patra
    Abstract:

    A polymeric nanoantenna-based Light Harvesting System is prospective because of it captures more number of photons by a multichromophoric donor and subsequently transfers its energy to the acceptor. Here, we have designed an aqueous solution-based polymeric nanoantenna, where conjugated polymer nanoparticles (donor) are attached with Au nanoparticle-capped porphyrin (acceptor)-encapsulated bovine serum albumin protein for both energy transfer and electron transfer processes. Ultrafast fluorescence upconversion and transient absorption spectroscopic studies reveal that the ultrafast energy transfer occurs from the conjugated polymer nanoparticle to porphyrin in 130 fs, followed by the electron transfer from porphyrin to Au nanoparticles in 70 ps after photoexcitation. Furthermore, the antenna effect of this Light Harvesting System is found to be 79 at the donor to acceptor ratio of 16:1. Analysis reveals that this polymeric nanoantenna opens up a new avenue for designing a highly efficient aqueous solution-based Light Harvesting System.

Haruo Inoue - One of the best experts on this subject based on the ideXlab platform.

  • active species transfer type artificial Light Harvesting System in the nanosheet dye complexes utilization of longer wavelength region of sunLight
    Tetrahedron Letters, 2018
    Co-Authors: Shunpei Suzuki, Tetsuya Shimada, Daichi Tatsumi, Takamasa Tsukamoto, Ryou Honna, Haruo Inoue, Shinsuke Takagi
    Abstract:

    Abstract A novel Light Harvesting System that captures long-wavelength Light of sunLight by the use of hole transfer was newly investigated. Ga phthalocyanine(GaIIITMAPc4+(D)) and Ru porphyrin(RuIIDMPyMP2+(A)) co-adsorbed reaction System on the synthetic nanosheet was examined as an artificial Light Harvesting System. By irradiating 660 nm Light, where GaIIITMAPc4+(D) absorbs, to the System under a presence of PtCl62− as an electron acceptor, cation radical of RuIIDMPyMP2+(A) was produced despite that Ru porphyrin adsorbs only 413 and 533 nm Light. The efficient hole transfer reaction from GaIIITMAPc4+(D)+ , that is generated from its excited state, to RuIIDMPyMP2+(A) takes place on the nanosheet.

  • Active species transfer-type artificial Light Harvesting System in the nanosheet – Dye complexes: Utilization of longer wavelength region of sunLight
    Tetrahedron Letters, 2018
    Co-Authors: Shunpei Suzuki, Tetsuya Shimada, Daichi Tatsumi, Takamasa Tsukamoto, Ryou Honna, Haruo Inoue, Shinsuke Takagi
    Abstract:

    Abstract A novel Light Harvesting System that captures long-wavelength Light of sunLight by the use of hole transfer was newly investigated. Ga phthalocyanine(GaIIITMAPc4+(D)) and Ru porphyrin(RuIIDMPyMP2+(A)) co-adsorbed reaction System on the synthetic nanosheet was examined as an artificial Light Harvesting System. By irradiating 660 nm Light, where GaIIITMAPc4+(D) absorbs, to the System under a presence of PtCl62− as an electron acceptor, cation radical of RuIIDMPyMP2+(A) was produced despite that Ru porphyrin adsorbs only 413 and 533 nm Light. The efficient hole transfer reaction from GaIIITMAPc4+(D)+ , that is generated from its excited state, to RuIIDMPyMP2+(A) takes place on the nanosheet.

  • Efficient excited energy transfer reaction in clay/porphyrin complex toward an artificial Light-Harvesting System.
    Journal of the American Chemical Society, 2011
    Co-Authors: Yohei Ishida, Tetsuya Shimada, Haruo Inoue, Dai Masui, Hiroshi Tachibana, Shinsuke Takagi
    Abstract:

    The quantitative excited energy transfer reaction between cationic porphyrins on an anionic clay surface was successfully achieved. The efficiency reached up to ca. 100% owing to the “Size-Matching Rule” as described in the text. It was revealed that the important factors for the efficient energy transfer reaction are (i) suppression of the self-quenching between adjacent dyes, and (ii) suppression of the segregated adsorption structure of two kinds of dyes on the clay surface. By examining many different kinds of porphyrins, we found that tetrakis(1-methylpyridinium-3-yl) porphyrin (m-TMPyP) and tetrakis(1-methylpyridinium-4-yl) porphyrin (p-TMPyP) are the suitable porphyrins to accomplish a quantitative energy transfer reaction. These findings indicate that the clay/porphyrin complexes are promising and prospective candidates to be used for construction of an efficient artificial Light-Harvesting System.

  • efficient excited energy transfer reaction in clay porphyrin complex toward an artificial Light Harvesting System
    Journal of the American Chemical Society, 2011
    Co-Authors: Yohei Ishida, Tetsuya Shimada, Haruo Inoue, Dai Masui, Hiroshi Tachibana, Shinsuke Takagi
    Abstract:

    The quantitative excited energy transfer reaction between cationic porphyrins on an anionic clay surface was successfully achieved. The efficiency reached up to ca. 100% owing to the “Size-Matching Rule” as described in the text. It was revealed that the important factors for the efficient energy transfer reaction are (i) suppression of the self-quenching between adjacent dyes, and (ii) suppression of the segregated adsorption structure of two kinds of dyes on the clay surface. By examining many different kinds of porphyrins, we found that tetrakis(1-methylpyridinium-3-yl) porphyrin (m-TMPyP) and tetrakis(1-methylpyridinium-4-yl) porphyrin (p-TMPyP) are the suitable porphyrins to accomplish a quantitative energy transfer reaction. These findings indicate that the clay/porphyrin complexes are promising and prospective candidates to be used for construction of an efficient artificial Light-Harvesting System.