HOME > Profile > TAKEUCHI, Masayuki
- Executive Vice President
- Group Leader, Molecular Design and Function Group, Macromolecules Field, Research Center for Macromolecules and Biomaterials
- Operating Officer, NTU-NIMS Joint Center for Materials Science, Division of International Collaborations and Public Relations
- Operating Officer, NTHU-NIMS Joint Center for Materials Science, Division of International Collaborations and Public Relations
- Address
- 305-0047 1-2-1 Sengen Tsukuba Ibaraki JAPAN [Access]
Accepting Students
External affiliations
Research
- Keywords
Macromolecules, Supramolecules, Organic Materials
We aim to create novel conjugated organic molecules, polymers, and their assemblies using synthetic organic and polymer chemistry as well as supramolecular chemistry, and to develop optical and electronic functions that surpass those of existing materials. In particular, through the development and organization of three-dimensionally designed conjugated molecules and polymers, together with organic soft materials whose phase structures and viscoelastic properties are precisely controlled, we seek to identify functional architectures that allow organic materials to realize their full potential.
PublicationsNIMS affiliated publications since 2004.
Society memberships
The Chemical Society of Japan, The Society of Polymer Science, Japan, American Chemical Society
NIMS
Development of Conjugated Organic Materials
Conjugated Molecules and Polymers, Molecular Assemblies, Molecular Recognition, Molecular Machine-Based Materials
Overview
Controlling the conformation and stereochemical configuration of conjugated molecules and polymers is crucial for eliciting their optical and electronic functions in both solution and assembled states, including the solid state. Accordingly, a wide variety of molecular designs and assembly strategies have been developed. In addition to the deliberate incorporation of intra- and intermolecular interaction sites into molecular structures, it is well recognized in supramolecular chemistry, structural organic chemistry, and organic semiconductor and polymer research that molecular conformations and assembled structures are strongly influenced by external environments, such as solvent and temperature.
We have extended molecular design principles originally developed for recognition materials bearing multiple recognition sites arranged in a divergent architecture. By controlling the dynamic properties of these molecular systems, we aim to develop functional materials that exhibit distinctive optical, electronic, and assembly-related functions.
Novelty and originality
● Molecular design enabling constrained dynamics and tunable interactions between conjugated molecules
● Control of the spatial arrangement of conjugated units in oligomers
● Multistep reversible reduction behavior
Details
We newly synthesized NDI-based conjugated cyclophanes (CycloNDIs) and their oligomers, in which naphthalenediimide (NDI) units are bridged by 1,8-diethynylanthracene linkers. The ethynyl rotational axes between the NDI and anthracene units enable control over the distance and relative orientation of the NDI moieties, while allowing their separation to vary within a confined range. As a result, these NDI derivatives retain structural flexibility without being conformationally locked by guest inclusion, such as solvent encapsulation.
These NDI derivatives exhibit reversible multistep reduction behavior, and the cyclophanes show relatively strong circularly polarized luminescence (CPL). We also found that a fluorenylidene derivative, a type of overcrowded alkene possessing two rotational axes, functions as a dynamic molecular probe capable of sensing and discriminating solvent parameters, despite being composed solely of simple aromatic hydrocarbon units.
Summary
Toward the control of the conformation and stereochemical arrangement of conjugated molecules and polymers, for which numerous molecular design and assembly strategies have been proposed, we have successfully developed new molecular systems by extending a molecular recognition-oriented design concept, in which recognition sites are introduced divergently around a molecular framework, toward optoelectronic functional materials.
These molecular systems are expected to provide a basis for the design of optically and electronically functional molecules and polymers, as well as for morphology control and the construction of precisely organized assemblies.
