X-ray crystal structure of Au38- xAgx(SCH2CH2Ph)24 alloy nanomolecules

Chanaka Kumara; Kevin J. Gagnon; Amala Dass

doi:10.1021/acs.jpclett.5b00270

X-ray crystal structure of Au_{38- x}Ag_x(SCH₂CH₂Ph)₂₄ alloy nanomolecules

Chanaka Kumara, Kevin J. Gagnon, Amala Dass

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

82 Scopus citations

Abstract

Herein, we report the X-ray crystallographic structure of a 38-metal atom Au-Ag alloy nanomolecule. The structure of monometallic Au₃₈(SR)₂₄ consists of 2 central Au atoms and 21 Au atoms forming a bi-icosahedral core protected by 6 dimeric and 3 monomeric units. In Au_38-xAg_x(SR)₂₄,where x ranges from 1 to 5, the silver atoms are selectively incorporated into the Au₂₁ bi-icosahedral core. Within the Au₂₁ core, the silver atoms preferentially occupy nine selected locations: (a) the two vertex edges, three atoms on each edge and six atoms total, and (b) the middle face-shared three-atom ring, adding to a total of nine locations. X-ray crystallography yielded a composition of Au_34.04Ag_3.96(SCH₂CH₂Ph)₂₄. The crystal structure of the alloy nanomolecule can be described in terms of shells as Au₂@Au_17.04Ag_3.96@ 6×[-SR-Au-SR-Au-SR] 3×[-SR-Au-SR-].

Original language	English
Pages (from-to)	1223-1228
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	6
Issue number	7
DOIs	https://doi.org/10.1021/acs.jpclett.5b00270
State	Published - Apr 2 2015
Externally published	Yes

Keywords

Au38
alloy nanomolecules
crystal structure
gold-silver alloy
monolayer protected clusters

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10.1021/acs.jpclett.5b00270

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title = "X-ray crystal structure of Au38- xAgx(SCH2CH2Ph)24 alloy nanomolecules",

abstract = "Herein, we report the X-ray crystallographic structure of a 38-metal atom Au-Ag alloy nanomolecule. The structure of monometallic Au38(SR)24 consists of 2 central Au atoms and 21 Au atoms forming a bi-icosahedral core protected by 6 dimeric and 3 monomeric units. In Au38-xAgx(SR)24,where x ranges from 1 to 5, the silver atoms are selectively incorporated into the Au21 bi-icosahedral core. Within the Au21 core, the silver atoms preferentially occupy nine selected locations: (a) the two vertex edges, three atoms on each edge and six atoms total, and (b) the middle face-shared three-atom ring, adding to a total of nine locations. X-ray crystallography yielded a composition of Au34.04Ag3.96(SCH2CH2Ph)24. The crystal structure of the alloy nanomolecule can be described in terms of shells as [email protected]@ 6×[-SR-Au-SR-Au-SR] 3×[-SR-Au-SR-].",

keywords = "Au38, alloy nanomolecules, crystal structure, gold-silver alloy, monolayer protected clusters",

author = "Chanaka Kumara and Gagnon, {Kevin J.} and Amala Dass",

note = "Publisher Copyright: {\textcopyright} 2015 American Chemical Society.",

year = "2015",

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doi = "10.1021/acs.jpclett.5b00270",

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volume = "6",

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T1 - X-ray crystal structure of Au38- xAgx(SCH2CH2Ph)24 alloy nanomolecules

AU - Kumara, Chanaka

AU - Gagnon, Kevin J.

AU - Dass, Amala

PY - 2015/4/2

Y1 - 2015/4/2

N2 - Herein, we report the X-ray crystallographic structure of a 38-metal atom Au-Ag alloy nanomolecule. The structure of monometallic Au38(SR)24 consists of 2 central Au atoms and 21 Au atoms forming a bi-icosahedral core protected by 6 dimeric and 3 monomeric units. In Au38-xAgx(SR)24,where x ranges from 1 to 5, the silver atoms are selectively incorporated into the Au21 bi-icosahedral core. Within the Au21 core, the silver atoms preferentially occupy nine selected locations: (a) the two vertex edges, three atoms on each edge and six atoms total, and (b) the middle face-shared three-atom ring, adding to a total of nine locations. X-ray crystallography yielded a composition of Au34.04Ag3.96(SCH2CH2Ph)24. The crystal structure of the alloy nanomolecule can be described in terms of shells as [email protected]@ 6×[-SR-Au-SR-Au-SR] 3×[-SR-Au-SR-].

AB - Herein, we report the X-ray crystallographic structure of a 38-metal atom Au-Ag alloy nanomolecule. The structure of monometallic Au38(SR)24 consists of 2 central Au atoms and 21 Au atoms forming a bi-icosahedral core protected by 6 dimeric and 3 monomeric units. In Au38-xAgx(SR)24,where x ranges from 1 to 5, the silver atoms are selectively incorporated into the Au21 bi-icosahedral core. Within the Au21 core, the silver atoms preferentially occupy nine selected locations: (a) the two vertex edges, three atoms on each edge and six atoms total, and (b) the middle face-shared three-atom ring, adding to a total of nine locations. X-ray crystallography yielded a composition of Au34.04Ag3.96(SCH2CH2Ph)24. The crystal structure of the alloy nanomolecule can be described in terms of shells as [email protected]@ 6×[-SR-Au-SR-Au-SR] 3×[-SR-Au-SR-].

KW - Au38

KW - alloy nanomolecules

KW - crystal structure

KW - gold-silver alloy

KW - monolayer protected clusters

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DO - 10.1021/acs.jpclett.5b00270

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SN - 1948-7185

VL - 6

SP - 1223

EP - 1228

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 7

ER -

X-ray crystal structure of Au_{38- x}Ag_x(SCH₂CH₂Ph)₂₄ alloy nanomolecules

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