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Title: Synthesis and Characterization of “Atlas-Sphere” Copper Nanoclusters: New Insights into the Reaction of Cu2+ with Thiols

Journal Article · · Inorganic Chemistry

Thiolates are a widely used ligand class for the stabilization of M(0)-containing gold and silver nanoclusters. Curiously, though, very few thiolate-stabilized Cu nanoclusters are known. Herein, we report an examination of the reactivity of RSH (R = CH2CH2Ph, n-Bu, n-C12H25) with Cu2+ under anhydrous conditions. These reactions result in the formation of fluorescent "Atlas-sphere"-type copper thiolate nanoclusters, including [Cu12(SR')6Cl12][(Cu(R'SH))6] (2, R' = nBu) and [H(THF)2]2[Cu17(SR'')6Cl13(THF)2(R''SH)3] (3, R'' = CH2CH2Ph), which were characterized by X-ray crystallography, electrospray ionization mass spectrometry, NMR spectroscopy, as well as X-ray absorption near-edge structure and extended X-ray absorption fine structure (EXAFS) spectroscopies. Consistent with our X-ray crystallographic results, the edge energies of 2 and 3 suggest they are constructed exclusively with Cu(I) ions. Likewise, EXAFS of 2 and 3 reveals long Cu-Cu pathlengths, which is also consistent with their X-ray crystal structures. Given these results, as well as past work on Cu2+/thiol reactivity, we suggest that Cu(0) is unlikely to be formed by the reaction of Cu2+ with a thiol and that previous reports of Cu(0)-containing nanoclusters synthesized by reaction of Cu2+ with thiols are likely erroneous.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Grant/Contract Number:
AC02-05CH11231; FG02-03ER15467
OSTI ID:
1581349
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 13 Vol. 58; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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