A5070475062- Organic Electronics and Photovoltaics
- Molecular Junctions and Nanostructures
- Conducting polymers and applications
- Porphyrin and Phthalocyanine Chemistry
- Spectroscopy and Quantum Chemical Studies
- Lipid Membrane Structure and Behavior
- Thin-Film Transistor Technologies
- Analytical Chemistry and Sensors
- Force Microscopy Techniques and Applications
- Advanced Chemical Physics Studies
- Synthesis and properties of polymers
- Supramolecular Self-Assembly in Materials
- Spectroscopy and Laser Applications
- Perovskite Materials and Applications
- Spectroscopy and Chemometric Analyses
- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Chromatography
- Photochemistry and Electron Transfer Studies
- Surface Modification and Superhydrophobicity
- X-ray Diffraction in Crystallography
- Fuel Cells and Related Materials
- Advanced Chemical Sensor Technologies
- Luminescence and Fluorescent Materials
- Spectroscopy Techniques in Biomedical and Chemical Research
- Crystallization and Solubility Studies
Gunma University
2024
Kyoto University Institute for Chemical Research
2014-2023
Kyoto University
2014-2023
Kyoto Bunkyo University
2013-2023
Instituto de Investigaciones Químicas
2014-2020
Kyoto College of Medical Science
2020
Hiroshima University
2008-2010
Tokyo Institute of Technology
2008
Abstract Connecting molecular-level phenomena to larger scales and, ultimately, sophisticated molecular systems that resemble living remains a considerable challenge in supramolecular chemistry. To this end, self-assembly at higher hierarchical levels has be understood and controlled. Here, we report unusual self-assembled structures formed from simple porphyrin derivative. Unexpectedly, one-dimensional (1D) polymer coiled give an Archimedean spiral. Our analysis of the polymerization by...
Abstract Perfluoroalkyl compounds are known to exhibit a hydrophobic character on the surface of material, although CF bond has large dipole, which should make molecular polar and hydrophilic. This inconsistency long been chemical matter be solved. Herein, stratified dipole‐arrays model is proposed: can fully hidden by forming two‐dimensional aggregate perfluoroalkyl (R f ) groups; this spontaneously induced dipole–dipole interaction arrays owing helical structure R group. In model, ‘short’...
The OH stretching (nu(OH)) band of methanol observed in condensed phase has been analyzed terms hydrogen-bonding patterns. Quantum chemical calculations for clusters have revealed that broadening the nu(OH) envelope is reasonably reproduced by considering nearest and next-nearest neighbor interactions through hydrogen bonding. Because bond formed between donor (D) acceptor (A) cooperatively strengthened or weakened a newly at D A, we proposed following notation patterns monohydric alcohols:...
Pentacene attracts a great deal of attention as basic material used in organic thin-film transistors for many years. is known to form highly ordered structure thin film, which the molecular long axis aligns perpendicularly substrate surface, i.e., end-on orientation. On other hand, face-on oriented where plane parallel substrate, has never been found on an inert represented by SiO2. As result, orientation believed be generated only specific substrates such metal single crystal. In present...
The potential of naphthalene-1,8:4,5-tetracarboxylic diimide (NDI-H) as a transparent electron-transporting material was examined. A soluble precursor designed and synthesized having two tert-butoxycarbonyl solubilizing substituents at the imide moieties. This molecule, NDI-Boc, is converted to hydrogen-substituted NDI-H by heating spin-coated films. molecular orientation during thermal conversion NDI-Boc examined using two-dimensional grazing incidence X-ray diffraction (2D-GIXD)...
The hydration structure of the 'strongly bound water' around sulfonic acid (SA) groups in Nafion, which has recently been revealed by (1)H NMR spectroscopy (Anal. Chem., 2013, 85, 7581), is studied using infrared with aid quantum chemical (QC) calculations. During a heated drying process, bulky water firstly dehydrated, followed disappearance hydronium ion and appearance bands that have assigned to fully dehydrated species at 140 °C. However, spectral simulation based on QC reveals spectrum...
The simplest hydrated HF was realized, whose properties were revealed by x-ray analysis, spectroscopy, and theoretical studies.
Partially fluorinated dimyristoylphosphatidylcholines (DMPCs) involving double alkyl chains are employed to control the phonon generation in thin films, which is examined by infrared (IR) spectroscopy coupled with multiple-angle incidence resolution spectrometry (MAIRS). technique. Compounds having perfluoroalkyl (Rf) known exhibit bands IR spectra because of strong dipole-dipole interactions. Since an organic matter have a similar shape normal absorption bands, however, recognition modes...
Infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (pMAIRS) is a useful spectroscopic tool for revealing the molecular anisotropic structure in thin film, which used orientation analysis of many functionalized organic films. pMAIRS provides both in-plane (IP) and out-of-plane (OP) vibrational mode spectra, are influenced by choice angles incidence, i.e., angle set. To obtain quantitatively reliable therefore, optimal set must be revealed. In former study, an...
Metal-oxide nanowires have demonstrated excellent capability in the electrical detection of various molecules based on their material robustness liquid and air environments. Although surface structure essentially determines interaction with adsorbed molecules, understanding correlation between an oxide nanowire molecule is still a major challenge. Herein, we propose rational methodology to obtain this information for low-density metal surfaces by employing infrared p-polarized multiple-angle...
The performance of an organic electronic device is significantly influenced by the anisotropic molecular structure in film, which has long been difficult to predict especially for a solution process. In present study, zinc tetraphenylporphyrin (ZnTPP) thin film prepared process was chosen comprehensively explore molecular-arrangement mechanism as function representative film-preparation parameters: solvent, technique, and thermal annealing. first analyzed using combination infrared...
Infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (pMAIRS) is a powerful tool for analyzing the molecular orientation in an organic thin film. In particular, pMAIRS works powerfully film with highly rough surface irrespective of degree crystallinity. Recently, optimal experimental condition has comprehensively been revealed, which accuracy analytical results largely improved. Regardless, some unresolved matters still remain. A structurally isotropic sample, example,...
A face-on oriented thin film of poly(3-hexylthiophene) (P3HT) is suitable for an organic semiconductor layer in a photovoltaic device, and thus analysis the structure terms molecular orientation crucial. Although often has poor crystallinity, diffraction techniques have long been employed structural analysis, only very minor crystal parts discussed. In our previous study, P3HT was revealed to uniquely even amorphous by using p-polarized multiple-angle incidence resolution spectrometry...
2-Decyl-7-phenyl[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT-C10) exhibits excellent performances as an active layer in organic thin-film transistors, and its are greatly influenced by the molecular packing, i.e., crystalline polymorphs. This compound has so-called phase a vapor-deposited film, which is different from single-crystal structure (the bulk phase). In this work, thin films of Ph-BTBT-C10 prepared spin coating, effect aging on film investigated high-resolution infrared (IR)...
The molecular structure of poly(3-alkylthiophene-2,5-diyl) in an amorphous film reveals that the short axis thiophene ring is kept highly oriented parallel to substrate, whereas long along polymer chain largely disordered. This unveiled by infrared p-polarized multiple-angle incidence resolution spectroscopy (pMAIRS), achieved analyzing orientation angles three mutually orthogonal vibrational modes localized on with aid a newly developed structural index. new analytical technique useful...
Spectral analysis using chemometrics is extensively used for quantitative chemical in a mixture, but it works powerfully only when the peak intensity solely proportional to quantity of components. In this sense, thin films on solid substrate are not suitable chemometric analysis, because molecular orientation also influences via surface selection rules. present study, long-term analytical issue has readily been overcome by p-polarized multiple-angle incidence resolution spectrometry...
Among many promising organic semiconducting materials, 2-decyl-7-phenyl[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT-C10) shows outstanding device performances for field-effect transistors. This compound has a highly ordered liquid crystalline state, i.e., the smectic E (SmE) phase. Although transition from state to SmE phase is believed accompany melting of alkyl chains, no spectroscopic evidence been found so far. In this study, conformational change decyl chains in Ph-BTBT-C10 films...
The CF2 symmetric stretching vibration (νs(CF2)) band of a perfluoroalkyl (Rf) group in an infrared (IR) spectrum exhibits unique character, that is, apparent high wavenumber shift with increasing the chain length, which is opposite character to CH normal alkyl chain. To reveal mechanism unusual IR shift, two vibrational characters Rf are focused: (1) helical conformation chain, (2) carbon (C) atoms having smaller mass than fluorine (F) atom dominantly vibrate as coupled oscillator leaving F...
The formation mechanism of a self-assembled monolayer (SAM) octadecyltrimethoxysilane on silicon oxide surface in reaction is studied situ by using high-speed atomic force microscope that has time resolution 2 s per frame. SAM silane coupling reagent known to comprise three development stages nucleation, growth, and coalescence. In the present study, first nucleation stage found have dynamical processes: molecular cluster attached substrate works as base, which additional reactive molecules...
Infrared surface spectroscopic techniques commonly have long-term issues that (1) the multiple reflections of light in substrate yield optical interference fringes absorption spectrum and (2) double modulation at interferometer a Fourier transform infrared spectrometer makes water-vapor subtraction impossible. These measurement troubles often disturb quantitative analysis chemical bands analyte thin film. Multiple-angle incidence resolution spectrometry (MAIRS) is not an exception this...