Faculty Profiles - TANAKA Kentaro

Papers - TANAKA Kentaro

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Arraying and Guest Inclusion of Soluble Metal-Organic Nanotubes Composed of Macrocyclic Paddle-Wheel Metal Complexes Reviewed International journal Open Access

S. Kawano, A. Sasaki, K. Tanaka

Angewandte Chemie International Edition Vol. 64 ( 12 ) page： e202422546 2025.3

Continuous Nanospace in Nanoporous Liquid Crystal Investigated by 129Xe NMR Spectroscopy Reviewed International journal

Shin-ichiro Kawano, Hiroaki Yoshimizu, Kentaro Tanaka

Angewandte Chemie International Edition Vol. 63 page： e2023165 2023.11

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Continuous nanopores within fluid materials could be used for novel chemical events such as the accommodation of guest molecules, unique arrays of the entrapped molecules, and chemical reactions in a dynamic molecular assembly. Columnar liquid crystals composed of a one‐dimensionally stacked assembly of shape‐persistent macrocycles form nanochannels owing to the intrinsic nanospace in the column. However, the existence of substantial nanoporosity has not been confirmed experimentally thus far. In this study, for the first time in the literature, we confirmed the presence of discrete and spatiotemporally continuous voids in a liquid‐crystalline material. In 129Xe NMR spectroscopy of liquid crystalline columnar assembly of imine‐bridged shape‐persistent macrocycles under Xe atmosphere, the NMR signals of the Xe atoms entrapped in the liquid‐crystalline macrocycle depended on the gas pressure and phase‐transition temperatures. These results indicate that the encapsulation of Xe gas molecules within the discrete and oriented nanospaces of nanoporous liquid crystals is different from the homogeneous dissolution of the solute in an ordinary solution.

DOI： 10.1002/anie.202316523

Thermally Stable Array of Discrete C60s on a Two-Dimensional Crystalline Adlayer of Macrocycles both in Vacuo and under Ambient Pressure Reviewed International journal

Shin-ichiro Kawano, Masato Nakaya, Masaaki Saitow, Atsuki Ishiguro, Takeshi Yanai, Jun Onoe, Kentaro Tanaka

Journal of the American Chemical Society Vol. 144 ( 15 ) page： 6749 - 6758 2022.4

Inorganic–Organic Framework Constructed by the Intercalation of a Double-Decker Porphyrin Metal Complex into Clay Nanosheets and Its Efficient Dye Adsorption Ability International journal

Yasuyuki Yamada, Toshio Nishino, Ayako Hashimoto, Yuka Toyoda, Hirofumi Yoshikawa, Kentaro Tanaka

ACS Applied Optical Materials Vol. 2 ( 3 ) page： 405 - 413 2024.2

Effect of porphyrin ligands on the catalytic CH4 oxidation activity of monocationic μ-nitrido-bridged iron porphyrinoid dimers by using H2O2 as an oxidant Reviewed International journal Open Access

Yasuyuki Yamada, Yusuke Miwa, Yuka Toyoda, Yoshiki Uno, Quan Manh Phung, Kentaro Tanaka

Dalton Transactions Vol. 53 ( 15 ) page： 6556 - 6567 2024

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

Catalytic methane and ethane oxidation activities by μ-nitrido-bridged iron porphyrinoid dimers containing one or two porphyrins in aqueous solutions containing excess H2O2 were compared with those by a μ-nitrido-bridged iron phthalocyanine dimer.

DOI： 10.1039/d3dt04313d

Open Access

Efficient catalytic direct C–H hydroxylation of benzene by graphite-supported μ-nitrido-bridged iron phthalocyanine dimer Reviewed International journal Open Access

Yasuyuki Yamada, Yoshiki Uno, Chee-Ming Teoh, Hirotaka Ohkita, Yuka Toyoda, Akiko Sakata, Yutaka Hitomi, Kentaro Tanaka

Catalysis Science & Technology Vol. 14 ( 17 ) 2024

Calamitic Liquid Crystals for Reversible Light‐modulated Phase Regulation based on Arylazopyrazole Photoswitches Reviewed International coauthorship International journal Open Access

Hoan Quan Tran, Shinichiro Kawano, Rebecca E. Thielemann, Kentaro Tanaka, Bart Jan Ravoo

Chemistry – A European Journal Vol. 30 page： e202304061 2023.11

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

The design of responsive liquid crystals enables a diversity of technological applications. Especially photochromic liquid crystals gained a lot of interest in recent years due to the excellent spatiotemporal control of their phase transitions. In this work we present calamitic light responsive mesogens based on a library of arylazopyrazole photoswitches. These compounds show liquid‐crystalline behavior as shown by differential scanning calorimetry, grazing incidence X‐ray diffraction and polarized optical microscopy. UV‐vis spectroscopy and NMR analysis confirmed the excellent photophysical properties in solution and thin film. Additionally, polarized optical microscopy studies of the pristine compounds show reversible phase transition upon irradiation with light. Moreover, as a dopant in the commercially available liquid crystal 4‐cyano‐4'‐pentylbiphenyl (5CB), the temperature range was reduced to ambient temperatures while preserving the excellent photophysical properties. Remarkably this co‐assembled system shows reversible liquid‐crystalline to isotropic phase transition upon irradiation with light of different wavelengths. The spatiotemporal control of the phase transition of the liquid crystals offers opportunities in the development of optical devices.

DOI： 10.1002/chem.202302958

Open Access

Kinetically-Locked Metallomacrocycle for Host-Guest Chemistry with Bulky Anions Reviewed

Shinichiro Kawano, Takahiro Harada, Ako Sasaki, Kentaro Tanaka

European Journal of Inorganic Chemistry Vol. 26 page： e20220592 2023.2

Evaluation of CH4 Oxidation Activity of High-Valent Iron-Oxo Species of A µ-Nitride-Bridged Heterodimer of Iron Porphycene and Iron Phthalocyanine Reviewed

Catalysis Science and Technology Vol. 13 page： 1725 - 1734 2023.1

Stacking of a Cofacially Stacked Iron Phthalocyanine Dimer on Graphite Achieved High Catalytic CH4 Oxidation Activity Comparable to That of pMMO Reviewed

Yasuyuki Yamada, Kentaro Morita, Takuya Sugiura, Yuka Toyoda, Nozomi Mihara, Masanari Nagasaka, Hikaru Takaya, Kiyohisa Tanaka, Takanori Koitaya, Naoki Nakatani, Hiroko Ariga-Miwa, Satoru Takakusagi, Yutaka Hitomi, Toshiji Kudo, Yuta Tsuji, Kazunari Yoshizawa, Kentaro Tanaka

JACS Au 2023.1

Synthesis of Isomeric Tb3+–Phthalocyanine Double–Decker Complexes Depending on the Difference in the Direction of Coordination Plane and Their Magnetic Properties Reviewed International coauthorship

Yasuyuki Yamada, Hiroaki Nakajima, Chisa Kobayashi, Yoshiaki Shuku, Kunio Awaga, Shigehisa Akine, Kentaro Tanaka

Chemistry - A European Journal Vol. 29 ( 1 ) page： e202203272 2023.1

Unraveling the reasons behind lead phthalocyanine acting as a good absorber for near-infrared sensitive devices Reviewed

Masahiro Kato, Hayato Yoshizawa, Masato Nakaya, Yasutaka Kitagawa, Koichi Okamoto, Tomoaki Yamada, Masahito Yoshino, Kentaro Tanaka, Jun Onoe

Scientific Reports Vol. 12 ( 1 ) page： 8810 2022.12

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

Lead phthalocyanine (PbPc) is well known to be used as a good near-infrared (NIR) light absorber for organic solar cells (OSCs) and photodetectors. The monoclinic and triclinic phases have been understood to absorb the visible and NIR regions, respectively, so far. In the present study, we demonstrated from the absorption spectra and theoretical analysis that the visible band considerably originates from not only the monoclinic but also the amorphous and triclinic phases, and revealed the exciton dynamics in the PbPc film from static/time-resolved photoluminescence (PL), which are first reported. By comparing the external quantum efficiency between PbPc- and ZnPc-based OSCs in relation to their structure, morphology, and optical (absorption and PL) characteristics, we unraveled the reasons behind the PbPc film used as a good absorber for NIR-sensitive devices.

DOI： 10.1038/s41598-022-12990-z

Other Link： https://www.nature.com/articles/s41598-022-12990-z

Synthesis of Isomeric Tb3+-Phthalocyanine Double-Decker Complexes Depending on the Difference in the Direction of Coordination Plane and Their Magnetic Properties Reviewed

Yasuyuki Yamada, Hiroaki Nakajima, Chisa Kobayashi, Yoshiaki Shuku, Kunio Awaga, Shigehisa Akine, Kentaro Tanaka

CHEMISTRY-A EUROPEAN JOURNAL 2022.12

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-V C H VERLAG GMBH

A C-4h symmetrically substituted phthalocyanine, 1,8,15,22-tertrakis(2,4-dimethylpent-3-oxy)phthalocyanine (H(2)TdMPPc), was used to synthesize Tb3+-phthalocyanine double-decker complexes ([Tb(TdMPPc)(2)]s). Because H(2)TdMPPc has C-4h symmetry, S,S, R,R, and meso isomers of [Tb(TdMPPc)(2)] were obtained depending on the difference in the direction of the coordination plane of two C-4h-type phthalocyanines with respect to a central Tb3+ ion. We investigated the physical properties of these [Tb(TdMPPc)(2)] isomers, including their single-ion magnetic properties, and found that the spin-reversal energy barrier (U-eff) of the meso isomer was apparently higher than that of the enantiomers. Detailed crystal structural analyses indicated that the meso isomer has a more symmetrical structure than do the enantiomers, thereby suggesting that the higher U-eff of the meso isomer originated from the more highly symmetrical structure.

DOI： 10.1002/chem.202203272

Web of Science

Significant Effect of the Flexibility of Bridging Alkyl Chains on the Proximity of Stacked Porphyrin and Phthalocyanine Conjugated with a Fourfold Rotaxane Linkage Reviewed

Yasuyuki Yamada, Hayato Iida, Shinya Shibano, Nozomi Mihara, Tatsuhisa Kato, Kentaro Tanaka

Chemistry – A European Journal Vol. 28 ( 37 ) page： e202200819 2022.7

Mesogenic discrete metallofoldamer for columnar liquid crystal Reviewed

Shin-ichiro Kawano, Kazutaka Narita, Yuka Ikemoto, Ako Sasaki, Kentaro Tanaka

Chemical Communications Vol. 58 ( 20 ) page： 3274 - 3277 2022.2

Metalloporphyrins substituted with N-carbazolyl groups quadruply at meso positions Reviewed

Shin-ichiro Kawano, Sae Kawada, Atsuya Matsubuchi, Kentaro Tanaka

Journal of Porphyrins and Phthalocyanines Vol. 26 ( 2 ) page： 140 - 146 2022.2

Direct catalytic benzene hydroxylation under mild reaction conditions by using a monocationic μ-nitrido-bridged iron phthalocyanine dimer with 16 peripheral methyl groups Reviewed International coauthorship

Yasuyuki Yamada, Chee-Ming Teoh, Yuka Toyoda, Kentaro Tanaka

New Journal of Chemistry Vol. 46 ( 3 ) page： 955 - 958 2022.1

Synthesis of a monocationic μ-nitrido-bridged iron porphycene dimer and its methane oxidation activity Invited Reviewed

Yasuyuki Yamada, Yusuke Miwa, Yuka Toyoda, Tomoo Yamaguchi, Shigehisa Akine, Kentaro Tanaka

Dalton Transactions Vol. 50 ( 45 ) page： 16775 - 16781 2021.12

Close-Stacking of Iron-Oxo-Based Double-Decker Complex on Graphite Surface Achieved High Catalytic CH4 Oxidation Activity Comparable to that of Methane Monooxygenases Reviewed

2021.6

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

Herein, we report that the close-stacking of a double-decker-type dinuclear iron phthalocyanine complex on a graphite surface is effective for achieving high methane oxidation activity, comparable to those of certain MMOs, in an aqueous solution.

DOI： 10.26434/chemrxiv.14728860.v1

A Light‐Harvesting/Charge‐Separation Model with Energy Gradient Made of Assemblies of meta ‐Pyridyl Zinc Porphyrins Reviewed International coauthorship International journal

Joe Otsuki, Takumi Okumura, Kosuke Sugawa, Shin‐ichiro Kawano, Kentaro Tanaka, Takehiro Hirao, Takeharu Haino, Yu Jin Lee, Seongsoo Kang, Dongho Kim

Chemistry – A European Journal Vol. 27 ( 12 ) page： 4053 - 4063 2021.2

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Papers - TANAKA Kentaro