Yoshinori Yamanoi

School of Science, The University of Tokyo
Associate Professor

Research AreasOrganoelement chemistry

Development of stimulation-responsive soft crystal using the characteristics of silicon-silicon bond

Silicon, Silicon–silicon bond, fluorescence, Second harmonic generation (SHG) , Circularly polarized luminescence (CPL)
Co-Researcher: Kenichiro Omoto (Nara Institute of Science and Technology, Assistant Professor)
Co-Researcher: Mariko Miyachi (School of Science, The University of Tokyo, Assistant Professor)
Co-Researcher: Muneyuki Hattori (National Institute of Advanced Industrial Science and Technology (AIST), Principle Researcher)
Co-Researcher: Toyotaka Nakae (School of Science, The University of Tokyo, Post Doctor)
Co-Researcher: Masaki Nishio (School of Science, The University of Tokyo, Researcher)

Research Outline

This research aims at the creation of soft crystals having silicon−silicon (Si−Si) bonds which display dramatic change in the crystal structure and optical properties by weak external stimulation. It is known that the Si−Si bond has almost the same chemical and physical properties as the C=C bond because their ionization potentials are almost the same. D−Si−Si−A type disilane compounds (D: donor group, A: acceptor group) take various crystal packings, and structural changes have impact on optical properties due to flexible Si−Si bond and weak molecule interaction. Thus, the disilane unit (Si−Si) shows optical properties different from C=C bond in the solid state. Here, we study the changes in optical properties (emission, SHG, and CPL) of various disilane or oligosilane crystals associated with weak external stimulation. Based on the results, immobilization and device integration by a vacuum deposition and/or a spin coat on the substrate are also investigated.

Changes in crystal packing and optical properties by external stimulation

Representative Achievements

  • “Multi-functional Octamethyltetrasila[2.2]cyclophanes: Conformational Variations, Circularly Polarized Luminescence, and Organic Electroluminescence”, Shimada, M.; Yamanoi, Y.;* Ohto, T.; Pham, S.-T.; Ryo Yamada, R.; Tada, H.; Omoto, K.; Tashiro, S.; Shionoya, M.; Hattori, M.; Jimura, K.; Hayashi, S.; Koike, H.; Iwamura, M.; Nozaki, K.; Nishihara, H.* J. Am. Chem. Soc. 2017, 139, 11214–11221.
    DOI: 10.1021/jacs.7b05671
  • “Access to Chiral Silicon Centers for Application to Circularly Polarized Luminescence Materials”, Koga, S.; Ueki, S.; Shimada, M.; Ishii, R.; Kurihara, Y.; Yamanoi, Y.;* Yuasa, J.; Kawai, T.; Uchida, T.; Iwamura, M.; Nozaki, K.; Nishihara, H.* J. Org. Chem. 2017, 82, 6108–6117.
    DOI: 10.1021/acs.joc.7b00583
  • “Bright Solid-State Emission of Disilane-Bridged Donor-Acceptor-Donor and Acceptor-Donor-Acceptor Chromophores”, Shimada, M.; Tsuchiya, M.; Sakamoto, R.; Yamanoi, Y.;* Nishibori, E.; Sugimoto, K.; Nishihara, H.* Angew. Chem. Int. Ed. 2016, 55, 3022–3026.
    DOI: 10.1002/anie.201509380
  • Unusual Reactivity of Group 14 Hydrides toward Organic Halides: Synthesis Studies and Application to Functional Materials
    Shimada, M.; Yamanoi, Y.;* Nishihara, H.* J. Synth. Org. Chem. Jpn. 2016, 74, 1098–1107.
    DOI: 10.5059/yukigoseikyokaishi.74.1098



Related Website(s)
yamanoi [at] chem.s.u-tokyo.ac.jp