CVClient

小澤 芳樹

オザワ ヨシキ  (Yoshiki Ozawa)

基本情報

所属
兵庫県立大学 大学院理学研究科 准教授

J-GLOBAL ID
200901022912482822
Researcher ID
F-1487-2013
researchmap会員ID
1000057761

学歴

 2

主要な論文

 124
  • Haruki Inoue, Yuga Yamashita, Yoshiki Ozawa, Toshikazu Ono, Masaaki Abe
    Molecules 26(21) 6731-6731 2021年11月6日  査読有り責任著者
    Two hexanuclear paddlewheel-like clusters appending six carboxylic-acid pendants have been isolated with the inclusion of polar solvent guests: [Cu6(Hmna)6]·7DMF (1·7DMF) and [Ag6(Hmna)6]·8DMSO (2·8DMSO), where H2mna = 2-mercaptonicotininc acid, DMF = N,N’-dimethylformamide, and DMSO = dimethyl sulfoxide. The solvated clusters, together with their fully desolvated forms 1 and 2, have been characterized by FTIR, UV–Vis diffuse reflectance spectroscopy, TG-DTA analysis, and DFT calculations. Crystal structures of two solvated clusters 1·7DMF and 2·8DMSO have been unambiguously determined by single-crystal X-ray diffraction analysis. Six carboxylic groups appended on the clusters trap solvent guests, DMF or DMSO, through H-bonds. As a result, alternately stacked lamellar architectures comprising of a paddlewheel cluster layer and H-bonded solvent layer are formed. Upon UV illumination (λex = 365 nm), the solvated hexasilver(I) cluster 2·8DMSO gives intense greenish-yellow photoluminescence in the solid state (λPL = 545 nm, ΦPL = 0.17 at 298 K), whereas the solvated hexacopper(I) cluster 1·7DMF displays PL in the near-IR region (λPL = 765 nm, ΦPL = 0.38 at 298 K). Upon complete desolvation, a substantial bleach in the PL intensity (ΦPL < 0.01) is observed. The desorption–sorption response was studied by the solid-state PL spectroscopy. Non-covalent interactions in the crystal including intermolecular H-bonds, CH⋯π interactions, and π⋯π stack were found to play decisive roles in the creation of the lamellar architectures, small-molecule trap-and-release behavior, and guest-induced luminescence enhancement.
  • Yoshiki Ozawa, Hiroki Iida, Hidetoshi Kiyooka, Kazutaka Nobori, Keishiro Tahara, Toshikazu Ono, Masaaki Abe
    Bulletin of the Chemical Society of Japan 94(2) 616-622 2021年2月15日  査読有り筆頭著者責任著者
  • Shiori Nagaoka, Yoshiki Ozawa, Koshiro Toriumi, Masaaki Abe
    CHEMISTRY LETTERS 47(9) 1101-1104 2018年9月  査読有り責任著者
    We demonstrate herein a novel molecular strategy for crystalline-state luminescence color tuning in the entire visible region by adopting thermochromic dual phosphorescence of coordination complexes. As crystals, a new cubane-type tetranuclear copper(I)-idodido complex with 2-benzylpyridine N-donor ligands 1 shows a sequential phosphorescence color change from yellow (298 K) to red and finally to blue (78 K) in the crystalline state across the color space area, in which relative intensity ratio of the triplet cluster-centered ((CC)-C-3) and triplet charge transfer ((CT)-C-3) bands in the dual-emission is reversibly controlled with temperature.
  • Hakuba Kitagawa, Yoshiki Ozawa, Koshiro Toriumi
    CHEMICAL COMMUNICATIONS 46(34) 6302-6304 2010年  査読有り
    Multitemperature X-ray structure analyses and photoemission spectra of [Cu4I4(PPh3)(4)] in two polymorphic crystals reveal that the cubane-like framework is flexibly distorted effecting luminescence thermochromism.

MISC

 19

書籍等出版物

 6

主要な講演・口頭発表等

 260

担当経験のある科目(授業)

 6

主要な共同研究・競争的資金等の研究課題

 10

主要な産業財産権

 4