A5030480718- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Luminescence and Fluorescent Materials
- Supramolecular Chemistry and Complexes
- Metal-Organic Frameworks: Synthesis and Applications
- Porphyrin and Phthalocyanine Chemistry
- Covalent Organic Framework Applications
- Photoreceptor and optogenetics research
- Molecular Sensors and Ion Detection
- Synthesis and Properties of Aromatic Compounds
- Photochromic and Fluorescence Chemistry
- Crystallography and molecular interactions
- Magnetism in coordination complexes
- Organic and Molecular Conductors Research
- Graphene research and applications
- Supramolecular Self-Assembly in Materials
- Polydiacetylene-based materials and applications
- Conducting polymers and applications
- Advanced NMR Techniques and Applications
- Chemical Synthesis and Characterization
- Chemical Synthesis and Analysis
- Click Chemistry and Applications
- 2D Materials and Applications
- Advanced Photocatalysis Techniques
- Axial and Atropisomeric Chirality Synthesis
Tohoku University
2022-2025
University of Groningen
2021-2023
The University of Tokyo
2015-2022
Graduate School USA
2015-2020
Bunkyo University
2015
Supramolecular materials are widely recognized among the most promising candidates for future generations of sustainable plastics because their dynamic functions. However, weak noncovalent cross-links that endow properties usually trade off materials' mechanical robustness. Here, we present discovery a simple and robust supramolecular cross-linking strategy based on acylhydrazine units, which can hierarchically cross-link solvent-free network poly(disulfides) by forming unique reticular...
To achieve efficacious photocatalytic overall water splitting, surface modification of photocatalysts with proficient cocatalysts for hydrogen evolution reaction (HER) is imperative. NiBHT, a conductive two-dimensional coordination polymer (2D CP), or 2D metal–organic framework MOF), endowed remarkable chemical stability and HER selectivity, emerged as promising candidate an cocatalyst. However, the bulky morphology NiBHT hampered its performance. Here, we demonstrate strategy to miniaturize...
Photoluminescent coordination nanosheets (CONASHs) comprising three-way terpyridine (tpy) ligands and zinc(II) ions are created by allowing the two constitutive components to react with each other at a liquid/liquid interface. Taking advantage of bottom-up CONASHs, or flexibility in organic ligand design modes, we demonstrate diversity tpy-zinc(II) CONASH structures photofunctions. A combination 1,3,5-tris[4-(4′-2,2′:6′,2″-terpyridyl)phenyl]benzene (1) Zn(BF4)2 affords cationic featuring...
One-dimensional (1D) coordination polymers (CPs) experiences limitations in exfoliation into individual strands, which hamper their utility as functional 1D nanomaterials. Here we synthesize chiral 1D-CPs that feature the bis(dipyrrinato)zinc(II) complex motif. They can be exfoliated single strands upon sonication organic media, retaining lengths of up to 3.19 μm (ca. 2600 monomer units). Their chiroptical structure allows wires show circularly polarized luminescence at an intensity 5.9...
This review summarizes recent progress in bis and tris(dipyrrinato)metal complexes, focusing on luminescence intensification, supramolecules nanostructures, materials applications.
Graphdiyne (GDY) comprises an important class in functional covalent organic nanosheets based on carbon–carbon bond formation, and recent focus has collected the expansion of its variations. Here we report synthesis a GDY analogue, TP-GDY, which triphenylene as aromatic core. Our liquid/liquid interfacial for (J. Am. Chem. Soc. 2017, 139, 3145) was modified hexaethynyltriphenylene monomer to afford TP-GDY film with free-standing morphology, smooth texture, domain size >1 mm, thickness 220...
Elucidating exciton migration in polymer chains has been one of the major research goals photophysics for over half a century. While great efforts have made to understand picosecond phenomena by ultrafast spectroscopy, ambiguous molecular conformations and/or random sequences hindered construction an ideal model. Here we present creation unique end-capped coordination nanochains and quantitative description intrachain therein. The nanochain features architectures discrete polynuclear...
Abstract Heteroleptic zinc(II) complexes synthesized using achiral dipyrrinato and chiral bis(oxazoline) ligands show bright fluorescence with quantum efficiencies of up to 0.70. The originates from the 1 π–π * photoexcited state localized exclusively on ligand. Furthermore, luminescence is circularly polarized despite achirality Single‐crystal X‐ray structure analysis discloses that ligand undergoes intramolecular stacking ligand, inducing axial chirality in moiety.
One-dimensional coordination polymers (1D-CPs) tend either to dissociate into constitutive ligands and metals readily in solution, or aggregate randomly amorphously, which prevents them from widespread application. In the present research, 1D-CPs comprising bridging dipyrrin divalent metal ions (Zn2+, Ni2+, Cu2+) are synthesized. A liquid/liquid interfacial reaction gives rise single crystals suitable for X-ray diffraction analysis: dichloromethane solution of ligand is layered with aqueous...
Coordination nanosheets are an emerging class of 2D, bottom-up materials having fully π-conjugated, planar, graphite-like structures with high electrical conductivities. Since their discovery, great effort has been devoted to expand the variety coordination nanosheets; however, in most cases, low crystallinity thick films hampers practical device applications. In this study, mixtures nickel and copper ions employed fabricate benzenehexathiolato (BHT)-based nanosheet films, serendipitously,...
Controlling dynamic stereochemistry is an important challenge, as it not only inherent to protein structure and function but often governs supramolecular systems self-assembly. Typically, disulfide bonds exhibit stereodivergent behavior in proteins; however, how chiral information transmitted remains unclear. Here, we report that hydrogen are essential the control of chirality enable transfer. The formation S–S···H–N solution can drive conformational adaption allow intramolecular transfer,...
In a chemical equilibrium, the formation of high-energy species-in closed system-is inefficient due to microscopic reversibility. Here, we demonstrate how this restriction can be circumvented by coupling dynamic equilibrium light-induced E/Z isomerization an azobenzene imine cage. The stable E-cage resists intermolecular exchange reactions that would "open" it. Upon switching, strained Z-cage isomers undergo spontaneously, thus opening Subsequent Z-open compounds yields high-energy,...
Circular polarized light is utilized in communication and display technologies a major challenge to develop systems that can be switched between left right circular luminescence with high degrees of polarization enable multiple addressable stable states. Luminescent dyes Liquid Crystal (LC) cholesteric phases are attractive generate, amplify modulate circularly (CPL). In the present study, we employ light-driven molecular motors as photo-controlled chiral dopants LCs switch handedness LC...
Light-induced 9,10-phenanthrenequinone-electron-rich alkene (PQ-ERA) photocycloadditions are an attractive new type of photoclick reaction, featuring fast conversions and high biocompatibility. However, the tunability reaction was hardly investigated up to now. To this end, we explored influence substituents on both partners rate between PQs ERAs. We identified handles for functionalization discovered that using enamines as ERAs leads drastically enhanced rates (>5400 times faster),...
Abstract Imines are photoaddressable motifs useful in the development of new generations molecular switches, but their operation with low‐energy photons and control over isomer stability remain challenging. Based on a computational design, we developed phenylimino indolinone (PIO), green‐light‐addressable T‐type photoswitch showing negative photochromism. The isomerization behavior this photoactuator iminothioindoxyl (ITI) class was studied using time‐resolved spectroscopies time scales from...
Abstract Photoactuators and photoluminescent dyes utilize light to perform mechanical motion undergo spontaneous radiation emission, respectively. Combining these two functionalities in a single molecule would benefit the construction of advanced molecular machines. Due possible detrimental interaction between light-dependent functional parts, design hybrid systems featuring both functions parallel remains highly challenging. Here, we develop light-driven rotary motor with an efficient dye...
Beyond the common supramolecular helical polymers in solutions, controlling single-crystal self-assembly with precisely defined chirality and architectures has been challenging. Here, we report that simply merging static homochiral amino acids dynamic chiral disulfides can produce a class of building blocks featuring unusual stereodivergency. Analysis 20 structures 1,2-dithiolanes gives an atom-precision understanding transfer from molecular to level, heterochiral solid state. The underlying...
The titled complex exhibits multi-functional luminochromism in the solid state, despite its simple chemical structure. shows solid-state vapochromism and mechanochromism. polymer analogue of undergoes solvatochromism thermochromism.
In artificial small-molecule machines, molecular motors can be used to perform work on coupled systems by applying a mechanical load-such as strain-that allows for energy transduction. Here, we report how ring strain influences the rotation of rotary motor. Bridging two halves motor with alkyl tethers varying sizes yields macrocycles that constrain motor's movement. Increasing size methylene increments increases mobility stepwise and fine-tuning in system. Small (8-14 units) only undergo...
Abstract Heteroleptic zinc(II) complexes synthesized using achiral dipyrrinato and chiral bis(oxazoline) ligands show bright fluorescence with quantum efficiencies of up to 0.70. The originates from the 1 π–π * photoexcited state localized exclusively on ligand. Furthermore, luminescence is circularly polarized despite achirality Single‐crystal X‐ray structure analysis discloses that ligand undergoes intramolecular stacking ligand, inducing axial chirality in moiety.
Heteroleptic bis(dipyrrinato)copper(<sc>ii</sc>) and nickel(<sc>ii</sc>) complexes are synthesized for the first time, their structural, photochemical, electrochemical properties disclosed.