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Dive into the research topics where Tomoyuki Haraguchi is active.

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Featured researches published by Tomoyuki Haraguchi.


IUCrData | 2017

6-[(R)-(2-Hy­droxy-1-phenyl­eth­yl)amino­methyl­idene]-4-(2-phenyl­diazen-1-yl)cyclohexa-2,4-dien-1-one

Ryoji Moriwaki; Shiomi Yagi; Tomoyuki Haraguchi; Takashiro Akitsu

The title chiral photochromic Schiff base compound, C21H19N3O2, was synthesized from (R)-(−)-2-phenylxadglycinol and salicylxadaldehyde of azoxadbenzene derivative. The molxadecule exhibits the keto–amine tautomeric form and displays characteristic features of azoxadbenzene derivatives. The diazenyl group adopts a trans (E) conformation, with N=N bond length of 1.260u2005(2)u2005A. The hyxaddroxy group is involved in an interxadmolecular O—H⋯O hydrogen bond.


Symmetry | 2018

Polarized Light-Induced Molecular Orientation Control of Rigid Schiff Base Ni(II), Cu(II), and Zn(II) Binuclear Complexes as Polymer Composites

Hiroyuki Nakatori; Tomoyuki Haraguchi; Takashiro Akitsu

We have investigated linearly polarized UV light-induced molecular orientation due to Weigert effect of composite materials of new six binuclear nickel(II), copper(II), and zinc(II) complexes of two rigid Schiff base ring ligands (L1 and L2) composite materials with methyl orange (MO), an azo-dye, in polyvinylalchol (PVA) cast films. To compare the degree of molecular orientation, two ligands, namely flexible aliphatic cyclohexane (ML1: NiL1, CuL1, ZnL1) and rigid aromatic (ML2: NiL2, CuL2, ZnL2), were synthesized using amine moiety. We have also characterized these complexes by means of elemental analysis, IR, and UV-vis spectra, single crystal or powder X-ray diffraction (XRD) analysis, and so on. Composite materials of ML1 or ML2+MO+PVA were also prepared to separately disperse the solutes in a polymer matrix. For any metal complexes, optical anisotropy (represented as the R parameters) of ML2+MO+PVA was larger than ML1+MO+PVA because of the rigidness of the ligands.


journal of chemistry and chemical engineering | 2017

Substituent Effect of Chiraldiphenyl Salen Metal (M = Fe(II), Co(II), Ni(II), Cu(II), Zn(II)) Complexes for New Conceptual DSSC Dyes

Shun Yamane; Yuuki Hiyoshi; Shinnosuke Tanaka; Shun Ikenomoto; Takashi Numata; Kazuya Takakura; Tomoyuki Haraguchi; Mauricio Alcolea Palafox; Michikazu Hara; Mutsumi Sugiyama; Takashiro Akitsu

The authors have designed and synthesized new chiral salen-type metal (M = Fe, Co, Ni, Cu, Zn) complexes (1-5) for new conceptual dyes (co-sensitizer or colorful multi-dyes) of DSSCs (dye-sensitized solar cells). The authors measured substituent effects on their absorption spectra and redox properties, and compared them with TD-DFT (time-dependent density functional theory) calculations. Electron withdrawing groups resulted in red-shift of ultraviolet-visible (UV-Vis) spectra. For the first time, the authors also proposed and confirmed the importance of substituent effects on their electric transition dipole moments, calculated by TD-DFT for designing dyes. Chemisorption for TiO2 of the complex by carboxyl groups was confirmed by XPS measurement. In view of electronic properties, all compounds have the possibility to be dyes of DSSCs.


IUCrData | 2017

Potassium 3-formyl-[1,1′-biphen­yl]-4-olate monohydrate

Ryoji Moriwaki; Tomoyuki Haraguchi; Takashiro Akitsu

The title salt, K+·C13H9O2−·H2O, was synthesized from 5-bromoxadsalicylxadaldehyde and a phenylxadboronic acid derivative using the Suzuki–Miyaura cross-coupling reaction (Miyaura & Suzuki, 1979). In addition to the interxadmolecular interxadactions between the charged species, two O—H⋯O hydrogen bonds involving the isolated water molxadecules further stabilize the crystal packing of the title salt leading to the formation of a three-dimensional framework structure.


Inorganics | 2018

Computational Treatments of Hybrid Dye Materials of Azobenzene and Chiral Schiff Base Metal Complexes

Takashiro Akitsu; Atsuo Yamazaki; Kana Kobayashi; Tomoyuki Haraguchi; Kazunaka Endo


Inorganica Chimica Acta | 2018

Photochemical reaction of amino acid Schiff base derived Cu complexes with extended π-system and their titanium oxide composites

Ryo Nakagame; A. A. Tsaturyan; Tomoyuki Haraguchi; Yulia Pimonova; T. A. Lastovina; Takashiro Akitsu; I. N. Shcherbakov


European Journal of Inorganic Chemistry | 2018

Emergence of Surface- and Interface-Induced Structures and Properties in Metal-Organic Framework Thin Films: Emergence of Surface- and Interface-Induced Structures and Properties in Metal-Organic Framework Thin Films

Tomoyuki Haraguchi; Kazuya Otsubo; Hiroshi Kitagawa


European Journal of Inorganic Chemistry | 2018

Cover Feature: Emergence of Surface- and Interface-Induced Structures and Properties in Metal-Organic Framework Thin Films (Eur. J. Inorg. Chem. 16/2018)

Tomoyuki Haraguchi; Kazuya Otsubo; Hiroshi Kitagawa


Acta Crystallographica Section E: Crystallographic Communications | 2018

Crystal structure of 3,6-dihydroxy-4,5-dimethylbenzene-1,2-dicarbaldehyde

Shu Yamazaki; Kazuki Nishiyama; Shiomi Yagi; Tomoyuki Haraguchi; Takashiro Akitsu


Acta Crystallographica Section E: Crystallographic Communications | 2018

Crystal structure of (E)-3-[(2,6-dimethylphenyl)diazenyl]-7-methyl-1H-indazole

Shiomi Yagi; Tomoyuki Haraguchi; Takashiro Akitsu

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Takashiro Akitsu

Tokyo University of Science

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Shiomi Yagi

Tokyo University of Science

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Ryoji Moriwaki

Tokyo University of Science

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Atsuo Yamazaki

Tokyo University of Science

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Kana Kobayashi

Tokyo University of Science

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Mutsumi Sugiyama

Tokyo University of Science

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Shinnosuke Tanaka

Tokyo University of Science

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Shun Ikenomoto

Tokyo University of Science

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