Establishment of a novel preparation method for metal nanoparticles and the particle size control

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05276
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 28030:Nanomaterials-related
• Research Institution: Kindai University
• Principal Investigator: Nakahodo Tsukasa 近畿大学, 理工学部, 准教授 (10375371)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 金属ナノ粒子 / 環状ジアミノセレノシクロファン / 酸化還元 / キラルアミノ酸 / 粒子径制御

Outline of Final Research Achievements

We have developed a novel methodology for synthesizing metal nanoparticles using diaminoselenocyclophanes. By dissolving diaminoselenocyclophanes containing chiral amino acid derivatives and gold(III) chloride in THF and irradiating them with ultraviolet light, uniform gold nanoparticles with a diameter of approximately 3 nm were generated. Furthermore, gold and palladium nanoparticles synthesized using diaminoselenocyclophanes incorporating optically active amino acid derivatives exhibited a positive and negative Cotton effect in their CD spectra, suggesting the induction of chirality at the nanoparticle interfaces. In the Suzuki-Miyaura cross-coupling reaction using Pd nanoparticles, a minimal degree of reactivity was observed, indicating the thermal instability of the Pd nanoparticles.

Free Research Field

ナノ機能物質化学

Academic Significance and Societal Importance of the Research Achievements

セレンが有する高い酸化還元能と、複数の窒素－セレン原子間で生じる可逆的かつ再現性の高い超原子価結合の形成・開裂反応を活用して新たな金属ナノ粒子の合成方法を構築する試みは、独創的であり大変興味深いと考えている。強力な還元剤を用いず、また大過剰の保護基の添加も不必要で、紫外光の照射のみで金属ナノ粒子を合成する例は、他に類を見ない挑戦的な試みであると考えている。分子の可逆的な構造変化を活用して様々な機能性を持つ有機・無機複合材料への展開も期待できる。本研究は、機能性分子の応用と活用の場を探っていく試みの一つとして非常に意義深いと考えている。