Takao Noguchi

Kyushu University

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Seiji Shinkai

Kyushu University

Daisuke Yoshihara

Institute of Systems, Information Technologies and Nanotechnologies

Tatsuhiro Yamamoto

Institute of Systems, Information Technologies and Nanotechnologies

Bappaditya Roy

The Ohio State University

Youichi Tsuchiya

Kyushu University

Junji Sakamoto

Panasonic (Japan)

Nobuo Kimizuka

Kyushu University

Keiki Kishikawa

Chiba University

Shigeo Kohmoto

Chiba University

Kenji Kaneko

Keio University

Cooperative Institutions

Kyushu University

Japan Science and Technology Agency

Graduate School USA

Kyoto University

Sojo University

The University of Tokyo

Institute of Systems, Information Technologies and Nanotechnologies

Osaka University of Pharmaceutical Sciences

Osaka Medical and Pharmaceutical University

Tokushima Bunri University

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Biodeposition of Copper Crystals by Marine Microorganisms

The Proceedings of Conference of Tokai Branch (2017)

Masahito Matsui Takao Noguchi Kenichi Murai Yuichi Nakamura

10.1299/jsmetokai.2017.66.801

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Photoresponsive Nanosheets of Polyoxometalates Formed by Controlled Self‐Assembly Pathways

Angewandte Chemie International Edition (2017)

Keita Ishiba Takao Noguchi Hiroaki Iguchi Masa‐aki Morikawa Kenji Kaneko

Abstract Anionic Keggin polyoxometalates (POMs) and ether linkage‐enriched ammonium ions spontaneously self‐assemble into rectangular ultrathin nanosheets in aqueous media. The structural flexibility of the cation is essential to form oriented nanosheets; as demonstrated by single‐crystal X‐ray diffraction measurements. The difference in initial conditions exerts significant influence on selecting for self‐assembly pathways in the energy landscape. Photoillumination of the POM sheets in pure water causes dissolution of reduced POMs, which allowed site‐specific etching of nanosheets using laser scanning microscopy. By contrast, photoetching was suppressed in aqueous AgNO 3 and site‐selective deposition of silver nanoparticles occurred as a consequence of electron transfer from the photoreduced POMs to Ag + ions on the nanosheet surface.

Nanosheet

Polyoxometalate

Deposition

10.1002/anie.201612473

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A Facile Supramolecular Approach towards Strategic Fluorescence Switching and Recognition‐Controlled Photoreduction

ChemPhotoChem (2017)

Bappaditya Roy Takao Noguchi Daisuke Yoshihara Junji Sakamoto Seiji Shinkai

Abstract A supramolecular system design strategy to control photoreduction is reported. 1,4,5,8‐naphthalenediimide (NDI) was used as the core unit to synthesize two different sets of ionic aromatic amphiphiles (AA), one incorporating the NDI with an aliphatic chain (denoted NDI) and the other with a phenoxy‐based chain (denoted NDI‐Phe). These systems form self‐assembled structures which are different to those in their monomeric states and which can selectively be photoreduced to generate the radical anion (NDI‐Phe .− ) and dianion (NDI 2− ) in the presence of dicarboxylic acids as the counter anion (CA). Interestingly, fluorescence (FL) switching was detected in the different redox states. The reduction mechanisms and the kinetics were found to be different for these two sets of AAs and the reduction kinetics were further controlled by the structurally different CAs. This unexpected observation reveals molecular recognition in the controlled‐assembly systems. The changes in spectroscopic output upon an electronic input have been described as a simple “off/on” FL switch. The appealing “bottom‐up” approach toward molecular device fabrication is possible only in molecular assembly systems such as these.

Molecular switch

10.1002/cptc.201700188

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凝集誘起発光(AIE)と動的共有結合形成の組合せ法のD-グルコースのレシオメトリック検知凝集誘起発光(AIE)と動的共有結合形成の組合せ法のD-グルコースのレシオメトリック検知

Chemistry Letters (2016)

Daisuke Yoshihara Takao Noguchi Roy Bappaditya Sakamoto Junji Yamamoto Tatsuhiro

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A Chiral Recognition System Orchestrated by Self‐Assembly: Molecular Chirality, Self‐Assembly Morphology, and Fluorescence Response

Angewandte Chemie (2017)

Takao Noguchi Bappaditya Roy Daisuke Yoshihara Junji Sakamoto Tatsuhiro Yamamoto

Abstract The newly developed oligophenylenevinylene (OPV)‐based fluorescent (FL) chiral chemosensor (OPV‐Me) for the representative enantiomeric guest, 1,2‐cyclohexanedicarboxylic acid (1,2‐CHDA: RR ‐ and SS ‐form) showed the high chiral discrimination ability, resulting in the different aggregation modes of OPV‐Me self‐assembly: RR ‐CHDA directed the fibrous supramolecular aggregate, whereas SS ‐CHDA directed the finite aggregate. The consequent FL intensity toward RR ‐CHDA was up to 30 times larger than that toward SS ‐CHDA. Accordingly, highly enantioselective recognition was achieved. Application to the chirality sensing was also possible: OPV‐Me exhibited a linear relationship between the FL intensity and the enantiomeric excess through the morphological development of stereocomplex aggregates. These results clearly show that the chiral recognition ability is manifested by the amplification cascade of the chirality difference through self‐assembly.

Chirality

Morphology

10.1002/ange.201706142

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Fluorescence Sensory System Orchestrated by Molecular Self-Assembly

Journal of Synthetic Organic Chemistry Japan (2017)

Takao Noguchi Daisuke Yoshihara Seiji Shinkai

Self-assembly has been utilized for the spontaneous formation of nanoarchitectures. Therein, a small change in the molecular structure dramatically alters the resulting macroscopic self-assembly morphologies and the consequent material properties. This macroscopic expression of the small initial difference via self-assembly can be alternatively regarded as precise translation of molecular structural information. In this contribution, we offer a novel molecular recognition concept utilizing self-assembly phenomena. A small difference in guest structures affords distinctly different self-assembly modes of fluorescent (FL) chemosensors, leading to their sensory responses characteristic to the guest structures. Thus, self-assembly has now been utilized as a FL sensory system for molecular recognition, particularly, of biologically important molecules and polymers. Here, we demonstrate that the integral magnitude of binding mechanism, self-assembly, and FL response realizes (i) selective FL detection of ATP, (ii) FL differentiation of dicarboxylates and keto-acids, and (iii) unexpectedly selective FL sensing of hyaluronic acid among glycosaminoglycans.

Molecular Recognition

10.5059/yukigoseikyokaishi.75.49

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Confining Molecules within Aqueous Coordination Nanoparticles by Adaptive Molecular Self‐Assembly

Angewandte Chemie International Edition (2009)

Ryuhei Nishiyabu Carole Aimé Ryosuke Gondo Takao Noguchi Nobuo Kimizuka

Dying on the inside: Functional dye molecules can be adaptively encapsulated in coordination nanoparticles (CNPs) of nucleotides and lanthanide ions in the course of their formation in water (see picture). Dyes confined in CNPs are conformationally restricted and surprisingly stable against molecular oxygen. These properties should be favorable for the development of light-harvesting CNPs.

Aqueous medium

10.1002/anie.200904124

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Confining Molecules within Aqueous Coordination Nanoparticles by Adaptive Molecular Self‐Assembly

Angewandte Chemie (2009)

Ryuhei Nishiyabu Carole Aimé Ryosuke Gondo Takao Noguchi Nobuo Kimizuka

Farbiges Inneres: Funktionelle Farbstoffmoleküle können adaptiv in Koordinationsnanopartikel (CNPs) aus Nucleotiden und Lanthanoid-Ionen während deren Bildung in Wasser eingeschlossen werden. Dort sind die Farbstoffmoleküle konformativ eingeschränkt und überraschend gut gegen molekularen Sauerstoff geschützt. Diese Eigenschaften sollten für die Entwicklung von lichtsammelnden CNPs günstig sein. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

10.1002/ange.200904124

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Citations (109)

褐毛和種の供給における産地の新たな取組みとその成果-高知県「土佐あかうし」の事例-

農業市場研究 (2015)

Takao Noguchi Masaya Kikuchi Abe Shin'ichi

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Ratiometric Sensing of d-Glucose in a Combined Approach of Aggregation-induced Emission (AIE) and Dynamic Covalent Bond Formation

Chemistry Letters (2016)

Daisuke Yoshihara Takao Noguchi Bappaditya Roy Junji Sakamoto Tatsuhiro Yamamoto

A novel saccharide sensing system has been established with an aggregation-induced emission (AIE)-cored probe by utilizing the dynamic covalent bond formation between the diol and boronic acid. Interestingly, this system can selectively sense d-glucose, and the fluorescence spectrum shows a ratiometric change arising from the d-glucose-induced stepwise morphological growth.

10.1246/cl.160240

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Citations (12)