Tomoyuki Haraguchi
Tokyo University of Science
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Featured researches published by Tomoyuki Haraguchi.
IUCrData | 2017
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
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
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
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
Takashiro Akitsu; Atsuo Yamazaki; Kana Kobayashi; Tomoyuki Haraguchi; Kazunaka Endo
Inorganica Chimica Acta | 2018
Ryo Nakagame; A. A. Tsaturyan; Tomoyuki Haraguchi; Yulia Pimonova; T. A. Lastovina; Takashiro Akitsu; I. N. Shcherbakov
European Journal of Inorganic Chemistry | 2018
Tomoyuki Haraguchi; Kazuya Otsubo; Hiroshi Kitagawa
European Journal of Inorganic Chemistry | 2018
Tomoyuki Haraguchi; Kazuya Otsubo; Hiroshi Kitagawa
Acta Crystallographica Section E: Crystallographic Communications | 2018
Shu Yamazaki; Kazuki Nishiyama; Shiomi Yagi; Tomoyuki Haraguchi; Takashiro Akitsu
Acta Crystallographica Section E: Crystallographic Communications | 2018
Shiomi Yagi; Tomoyuki Haraguchi; Takashiro Akitsu