A5070768566- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Luminescence and Fluorescent Materials
- Organoboron and organosilicon chemistry
- Porphyrin and Phthalocyanine Chemistry
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Conducting polymers and applications
- Synthesis and characterization of novel inorganic/organometallic compounds
- Crystallography and molecular interactions
- Metal-Organic Frameworks: Synthesis and Applications
- Supramolecular Chemistry and Complexes
- Synthetic Organic Chemistry Methods
- Molecular Sensors and Ion Detection
- Advanced Sensor and Energy Harvesting Materials
- Radical Photochemical Reactions
- Supramolecular Self-Assembly in Materials
- Organic Electronics and Photovoltaics
- Organophosphorus compounds synthesis
- Photochemistry and Electron Transfer Studies
- Molecular Junctions and Nanostructures
- Perovskite Materials and Applications
- Chemical Synthesis and Reactions
- Chemical Reaction Mechanisms
- Diet, Metabolism, and Disease
- Image and Object Detection Techniques
National Institute for Materials Science
2016-2024
University of Tsukuba
2017-2019
National Alliance on Mental Illness
2017
Nagoya University
1974-2014
Technische Universität Berlin
2014
Osaka University
1986
Luminescent mechanochromism has been intensively studied in the past few years. However, difference anisotropic grinding and isotropic compression is not clearly distinguished many cases, spite of importance this discrimination for application such mechanochromic materials. We now report distinct luminescent responses a new organic fluorophore, tetrathiazolylthiophene, to these stresses. The multichromism achieved over entire visible region using single fluorophore. different mechanisms blue...
Abstract An amine‐embedded flexible alkyl strap has been incorporated into an emissive boryl‐substituted dithienylpyrrole skeleton as a new entity of excited‐state intramolecular proton transfer (ESIPT) chromophores. The π‐electron system shows dual emission, which covers wide range the visible region depending on solvent polarity. incorporation aminoalkyl well terminal boryl groups efficiently stabilize zwitterionic species resulting from ESIPT even in aqueous medium.
A remaining major challenge in the asymmetric addition of silicon nucleophiles to typical prochiral acceptors, enantioselective 1,2-addition aldimines, is addressed. Activation SiB bond pronucleophile by a copper(I) alkoxide with McQuade's chiral six-membered N-heterocyclic carbene as supporting ligand releases nucleophile, which adds various aldimines high levels enantioselectivity. The new method provides catalytic access α-silylated amines.
Solvent-free, nonvolatile, room-temperature alkylated-π functional molecular liquids (FMLs) are rapidly emerging as a new generation of fluid matter. However, precision design to tune their physicochemical properties remains serious challenge because the governed by subtle π-π interactions among π-units, which very hard control and characterize. Herein, we address issue probing with highly sensitive pyrene-fluorescence. A series alkylated pyrene FMLs were synthesized. The photophysical...
Flexible/stretchable electrets based on organic molecules and polymers, in particular, highly deformable liquid are a promising candidate for future implantable/wearable soft electronics.
Give and take: The introduction of NHC–borane moieties to thiophene-based π skeletons endows a zwitterionic character, which makes the system electron-donating, while NHC ring acts as an electron-accepting moiety. NHC–borane-substituted thiophene underwent clean photoisomerization with drastic color change, however, expanded bithiophene derivatives were inert this photoreaction, showed low oxidation potentials, formed slipped π-stacked array in crystal. Detailed facts importance specialist...
Abstract Optoelectronically active viscous liquids are ideal for fabricating foldable/stretchable electronics owing to their excellent deformability and predictable π-unit–based optoelectronic functions, which independent of the device shape geometry. Here we show, unprecedented ‘liquid electret’ devices that exhibit mechanoelectrical electroacoustic as well stretchability, have been prepared using solvent-free liquid porphyrins. The fluidic nature free-base alkylated-tetraphenylporphyrins...
Abstract The development of optoelectronically‐active soft materials is drawing attention to the application electronics. A room‐temperature solvent‐free liquid obtained by modifying a π‐conjugated moiety with flexible yet bulky alkyl chains promising functional material. Tuning elastic modulus ( G ′) essential for employing alkyl–π liquids in deformable devices. However, range ′ achieved through molecular design limited. We report herein method controlling gelation. Adding 1 wt %...
On the move: The title compounds 1, which are unique heterocyclic systems containing a PB bond, have been synthesized by reduction of 1-diarylboryl-8-dichlorophosphinonaphthalene derivatives (see scheme). Both experimental and theoretical results for 1 revealed an effective interaction between phosphorus atom, boron naphthyl moiety. Furthermore, exhibits orange fluorescence in solution.
We have synthesized a series of new fluorescent boron systems 1a–c and 2a–d based on nitrogen (NNN) or oxygen (ONO)-containing tridentate ligands. These novel dyes are characterized by high thermal chemical stability. They show large Stokes shifts (mostly above 3200 cm–1) quantum yields in solution the solid state up to 40%. The easy, modular synthesis facilitates convenient variation axial substituent central atom, allowing functionalization this dye for biochemical use. Introducing long...
Abstract An amine‐embedded flexible alkyl strap has been incorporated into an emissive boryl‐substituted dithienylpyrrole skeleton as a new entity of excited‐state intramolecular proton transfer (ESIPT) chromophores. The π‐electron system shows dual emission, which covers wide range the visible region depending on solvent polarity. incorporation aminoalkyl well terminal boryl groups efficiently stabilize zwitterionic species resulting from ESIPT even in aqueous medium.
Novel regioisomeric alkylated-naphthalene liquids were designed and synthesized. In the solvent-free liquid state, 1-alkyloxy regioisomers showed excimeric luminescence, whereas 2-alkyloxy analogues exhibited monomer-rich luminescence features. Correlations among molecular structures photophysical, calorimetric, rheological properties are presented, demonstrating impact of regioisomerism on alkylated-chromophore systems.
Abstract Diese Arbeit befasst sich mit einer noch verbliebenen, bedeutenden Herausforderung der asymmetrischen Addition von Siliciumnukleophilen an typische prochirale Akzeptoren, enantioselektiven 1,2‐Addition Aldimine. Die Aktivierung Si‐B‐Bindung des Siliciumpronukleophils durch ein Kupfer(I)‐Alkoholat McQuades chiralem sechsgliedrigen N‐heterocyclischen Carben als Ligand setzt das Siliciumnukleophil frei, hohen Enantioselektivitäten verschiedenartige Aldimine addiert. neue Methode bietet...
Luminescence tuning with excellent homogeneity and steadiness of the resulting colour is guaranteed by chemical modification fluorescent molecular liquid.
Although strong chiral self-sorting often emerges in extended covalent or supramolecular polymers, the phenomenon is generally weak discrete assemblies (e.g., dimers and oligomers) of small molecules due to lack a cooperative growth mechanism. Consequently, has been overlooked design switchable metastable structures. Here, we report butyl-benzo[h]quinoline-based iridium(III) complex (Bu-Ir) with helical chirality at its metal center, which forms preferentially homochiral dimer exhibits...
Alkyl-π functional molecular liquids (FMLs) are of interest for fabricating soft electronic devices due to their fluidic nature and innate optoelectronic functions from the π-conjugated moiety. However, predictable development alkyl-π FMLs with desired liquid properties is challenging. A series alkyl-distyrylbenzene (DSB) was studied in terms substituent position effect by attaching 2-octyldodecyl chains at (2,4-), (2,5-), (2,6-), (3,5-). The alkyl chain length investigated 2-hexyldecyl,...
We report the synthesis and photophysical properties of poly(aryleneethynylene)s (PAEs) containing disilyl- or tetrasilyl-substituted phenylene as key building unit. The fluorescence spectra one PAEs, consisting diethynylbis(trimethylsilyl)phenylene fluorenylene units, shows an intense blue emission with maximum at 428 nm. absolute quantum yield (Phi(F)) lifetime (tau(s)) are 0.92 0.39 ns, respectively. calculated radiative decay rate constant (k(r)) from singlet excited state, based on...
Interaktion ist alles: Die Titelverbindungen 1, die ein einzigartiges heterocyclisches System mit einer P-B-Bindung enthalten, sind durch Reduktion von 1-Diarylboryl-8-dichlorphosphanylnaphthalinen zugänglich (siehe Schema). Sowohl experimentelle als auch theoretische Befunde belegen in 1 eine effektive Wechselwirkung zwischen Phosphoratom, Boratom und Naphthyleinheit. Außerdem fluoresziert Lösung orange. Detailed facts of importance to specialist readers are published as ”Supporting...
Geben und Nehmen: Die Einführung einer NHC-Boran-Hälfte in Thiophen-basierte π-Gerüste ergibt einen zwitterionischen Charakter, der das π-System elektronenschiebend macht, während NHC-Ring als elektronenziehende Hälfte fungiert. Das NHC-Boran-substituierte Thiophen photoisomerisiert mit drastischer Farbänderung, demgegenüber sind die expandierten Dithiophenderivate inert gegenüber Photoreaktion, zeigen ein niedriges Oxidationspotential bilden verschobene π-Stapel im Kristall. Detailed facts...
The development of optoelectronically-active soft materials is drawing attention to the application electronics. A room-temperature solvent-free liquid obtained by modifying a π-conjugated moiety with flexible yet bulky alkyl chains promising functional material. Tuning elastic modulus (G′) essential for employing alkyl–π liquids in deformable devices. However, range G′ achieved through molecular design limited. We report herein method controlling gelation. Adding 1 wt% low-molecular-weight...
Abstract This paper proposes a method of partial contour processing by curvature function and an adaptive integral filter. The filter parameter is determined the length zero‐crossing segment both to enhance concavo‐convex parts eliminate quantization noise raw function. Partial matching contours performed precisely efficiently using filtered Three tasks were accomplished abovementioned method: assembly jigsaw puzzle, discrimination overlapping rotating figures, tracking moving object which...
Although strong chiral self-sorting (e.g., sergeants and soldiers principle, majority rules) often emerges in extended covalent or supramolecular polymers, the phenomenon is generally weak discrete assemblies dimers, oligomers) of small molecules due to lack a cooperative growth mechanism. Consequently, has been overlooked design switchable metastable structures. Here we report benzo[h]quinoline-based iridi-um(III) complex (Ir) with helical chirality at its metal centre, which forms...
Abstract The development of optoelectronically‐active soft materials is drawing attention to the application electronics. A room‐temperature solvent‐free liquid obtained by modifying a π‐conjugated moiety with flexible yet bulky alkyl chains promising functional material. Tuning elastic modulus ( G ′) essential for employing alkyl–π liquids in deformable devices. However, range ′ achieved through molecular design limited. We report herein method controlling gelation. Adding 1 wt %...