Extremely high stability of glutathionate-protected Au25 clusters against core etching

Yukatsu Shichibu; Yuichi Negishi; Hironori Tsunoyama; Masayuki Kanehara; Toshiharu Teranishi; Tatsuya Tsukuda

doi:10.1002/smll.200600611

Extremely high stability of glutathionate-protected Au₂₅ clusters against core etching

Yukatsu Shichibu, Yuichi Negishi, Hironori Tsunoyama, Masayuki Kanehara, Toshiharu Teranishi, Tatsuya Tsukuda

Research output: Contribution to journal › Article › peer-review

353 Citations (Scopus)

Abstract

The etching reactivity of glutathionate (SG) protected Au _n(SG)_m clusters, where (n,m)=(10,10), (15,13), (18, 14), (22,16), (25,18), (29,20), (33, 22), and (39, 24) by free glutathione (GSH) under aerobic condition, was analyzed. It was observed that the colors of the solution of smaller Au_n(SG)_m cluster (core size n<25) faded after the addition of free GSH and became cloudy after three hours, while those for larger clusters (n≥25) did not exhibited appreciable color changes. The Au₂₅(SG)₁₈ and Au₃₉(SG)₂₅ showed the highest stability during storage in water for two weeks at ambient temperature. The high stability of Au₂₅(SG)₁₈ against core etching was contributed by chemical inertness arising from full protection by the SG ligands.

Original language	English
Pages (from-to)	835-839
Number of pages	5
Journal	Small
Volume	3
Issue number	5
DOIs	https://doi.org/10.1002/smll.200600611
Publication status	Published - 2007 May 1
Externally published	Yes

Keywords

Clusters
Core/shell materials
Etching
Glutathione
Gold

ASJC Scopus subject areas

Biotechnology
Biomaterials
Chemistry(all)
Materials Science(all)

Access to Document

10.1002/smll.200600611

Cite this

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title = "Extremely high stability of glutathionate-protected Au25 clusters against core etching",

abstract = "The etching reactivity of glutathionate (SG) protected Au n(SG)m clusters, where (n,m)=(10,10), (15,13), (18, 14), (22,16), (25,18), (29,20), (33, 22), and (39, 24) by free glutathione (GSH) under aerobic condition, was analyzed. It was observed that the colors of the solution of smaller Aun(SG)m cluster (core size n<25) faded after the addition of free GSH and became cloudy after three hours, while those for larger clusters (n≥25) did not exhibited appreciable color changes. The Au25(SG)18 and Au39(SG)25 showed the highest stability during storage in water for two weeks at ambient temperature. The high stability of Au25(SG)18 against core etching was contributed by chemical inertness arising from full protection by the SG ligands.",

keywords = "Clusters, Core/shell materials, Etching, Glutathione, Gold",

author = "Yukatsu Shichibu and Yuichi Negishi and Hironori Tsunoyama and Masayuki Kanehara and Toshiharu Teranishi and Tatsuya Tsukuda",

year = "2007",

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doi = "10.1002/smll.200600611",

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T1 - Extremely high stability of glutathionate-protected Au25 clusters against core etching

AU - Shichibu, Yukatsu

AU - Negishi, Yuichi

AU - Tsunoyama, Hironori

AU - Kanehara, Masayuki

AU - Teranishi, Toshiharu

AU - Tsukuda, Tatsuya

PY - 2007/5/1

Y1 - 2007/5/1

N2 - The etching reactivity of glutathionate (SG) protected Au n(SG)m clusters, where (n,m)=(10,10), (15,13), (18, 14), (22,16), (25,18), (29,20), (33, 22), and (39, 24) by free glutathione (GSH) under aerobic condition, was analyzed. It was observed that the colors of the solution of smaller Aun(SG)m cluster (core size n<25) faded after the addition of free GSH and became cloudy after three hours, while those for larger clusters (n≥25) did not exhibited appreciable color changes. The Au25(SG)18 and Au39(SG)25 showed the highest stability during storage in water for two weeks at ambient temperature. The high stability of Au25(SG)18 against core etching was contributed by chemical inertness arising from full protection by the SG ligands.

AB - The etching reactivity of glutathionate (SG) protected Au n(SG)m clusters, where (n,m)=(10,10), (15,13), (18, 14), (22,16), (25,18), (29,20), (33, 22), and (39, 24) by free glutathione (GSH) under aerobic condition, was analyzed. It was observed that the colors of the solution of smaller Aun(SG)m cluster (core size n<25) faded after the addition of free GSH and became cloudy after three hours, while those for larger clusters (n≥25) did not exhibited appreciable color changes. The Au25(SG)18 and Au39(SG)25 showed the highest stability during storage in water for two weeks at ambient temperature. The high stability of Au25(SG)18 against core etching was contributed by chemical inertness arising from full protection by the SG ligands.

KW - Clusters

KW - Core/shell materials

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