Preparation and application of chiral inorganic materials

2022 Fiscal Year Final Research Report

• Project/Area Number: 19H02767
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 35010:Polymer chemistry-related
• Research Institution: Kanagawa University
• Principal Investigator: Jin Ren-Hua 神奈川大学, 化学生命学部, 教授 (60271136)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: ポリエチレンイミン / キラル転写 / キラルシリカ / キラルチタニア / 円偏光発光 / ラマン散乱増強 / 分子性キラリティ / 不斉認識

Outline of Final Research Achievements

Using a complex (PT) composed of polyethyleneimine (PEI) and chiral organic acids as a primary chiral source, we successfully transferred their chiral information into silica and titania, and then using the silica as secondary chiral source, established chirality transfer from silica to metal complexes, metal nanoparticles, condensation polymers, addition polymers. In the application of chiral silica, we identified that chiral silica could be used as a probe of surface enhanced Raman scattering to discriminate enantiomeric amino acid, and constructed inorganic/organic or inorganic/inorganic circularly polarized luminescent materials by combining organic or inorganic emitters. Based on the CD spectra, we proposed that the chirality in silica/titania arises from distortion of the bond of Si-O and Ti-O in tetrahedral/hexahedral. It can be said that the chiral transcription from PT to silica/titania is a process that causes molecular-scale chirality in the targeting materials.

Free Research Field

高分子及びハイブリッド材料

Academic Significance and Societal Importance of the Research Achievements

キラル無機材料の構築では有機系に比べ、形状キラリティを主眼にすることが多い。要は可視レベルでのねじれ、ヘリックスなどである。本研究の成果はそれらと一線を画し、シリカ・チタニアなどの無機材料構造中の化学結合に由来のキラリティ発現を明らかにしたことで、その応用価値を高めることができた。実際、本研究でのキラルシリカは新しい不斉源として、キラルポリマーの合成、ラマン散乱増強によるエナンチオマー識別、円偏光発光などに展開できた。これらの知見は新しいキラル光学材料の開発に大きな意義を有すると考えられる。