2021 Fiscal Year Final Research Report

Synthesis of Au complex coordinated with amino acid for preparation of supported small Au nanoparticles

Research Project

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Project/Area Number	19K05214
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	Kyushu University
Principal Investigator	Murayama Haruno 九州大学, 理学研究院, 准教授 (90426528)
Co-Investigator(Kenkyū-buntansha)	徳永信九州大学, 理学研究院, 教授 (40301767) 本間徹生公益財団法人高輝度光科学研究センター, 産業利用・産学連携推進室, 主幹研究員 (50443560)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	担持金ナノ粒子 / 金－アミノ酸錯体 / X線吸収微細構造 / 選択的吸着剤 / メスバウアー分光法
Outline of Final Research Achievements	To prepare supported small gold nanoparticles, water-soluble and chloride-free gold (Au) complexes coordinated with various kinds of amino acids, such as β-alanine, γ-aminobutyric acid, tryptophan, histidine, tyrosine, and aspartic acid, were synthesized. Au nanoparticles were prepared with less than 3 nm diameter by the impregnation method. Particularly, Au nanoparticles with less than 2 nm diameter were provided using Au complex coordinated with tryptophan. Local structures of Au were analyzed by Au L3-edge X-ray absorption fine structure and 197Au Mossbauer spectra. Moreover, thermal behavior, containing decomposition temperature and reduction temperature, was investigated by TG-DTA. The molecular structures of Au complexes coordinated with β-alanine and γ-aminobutyric acid were determined as mononuclear complexes of Au3+ with square-planar coordination. While complexes coordinated with α-amino acid were mixture of Au3+ and Au1+, which was linear coordination.
Free Research Field	ナノ科学，触媒化学，X線構造解析
Academic Significance and Societal Importance of the Research Achievements	粒子径が数 nm以下の微小な金ナノ粒子の特性を応用する研究が広まっている。金ナノ粒子を担体上に固定化することは分離，回収，再利用や大スケールでの取り扱いの容易さの点から，実用に適しているといえる。しかし，その調製法において前駆体が塩化金酸にほぼ限られていることが原因で，ナノ粒子材料の機能の一端を担う担体の選択が制限されるという課題があった。本研究では，前駆体として水溶性が高く，塩化物イオンを含まない金－アミノ酸錯体を新規合成した。これまで金ナノ粒子の固定化が難しかったシリカや活性炭上に最小で2 nm以下の金ナノ粒子を担持することができ，今後の金ナノ粒子応用研究に貢献することが期待される。