TY - JOUR
T1 - Ubiquitous 8 and 29 kDa gold:alkanethiolate cluster compounds
T2 - Mass-spectrometric determination of molecular formulas and structural implications
AU - Chaki, Nirmalya K.
AU - Negishi, Yuichi
AU - Tsunoyama, Hironori
AU - Shichibu, Yukatsu
AU - Tsukuda, Tatsuya
PY - 2008/7/9
Y1 - 2008/7/9
N2 - The molecular formulas and charge state distributions of thus-far known ubiquitous alkanethiolate-protected gold clusters with core-masses of 8 and 29 kDa were assessed using electrospray ionization mass spectrometry. The 8 and 29 kDa clusters were determined to be composed of single species, [Au38(SCn)24]z and [Au144(SCn)59]z, respectively, with charge states of z ≥ 0. Possible geometric structures for Au38(SCn)24 and Au144(SCn)59 are discussed, based on the structures of relevant systems that have been recently determined experimentally and theoretically: [Au25(SR)18]- and Au102(SR)44, in which the Au cores are protected by monomers [-SR-Au-SR-] and/or dimers [-SR-Au-SR-Au-SR-]. Their preferential formation and chemical robustness are proposed as being associated with high stability due to geometric factors, while the Au-thiolate interface takes on common motifs regardless of the underlying Au core.
AB - The molecular formulas and charge state distributions of thus-far known ubiquitous alkanethiolate-protected gold clusters with core-masses of 8 and 29 kDa were assessed using electrospray ionization mass spectrometry. The 8 and 29 kDa clusters were determined to be composed of single species, [Au38(SCn)24]z and [Au144(SCn)59]z, respectively, with charge states of z ≥ 0. Possible geometric structures for Au38(SCn)24 and Au144(SCn)59 are discussed, based on the structures of relevant systems that have been recently determined experimentally and theoretically: [Au25(SR)18]- and Au102(SR)44, in which the Au cores are protected by monomers [-SR-Au-SR-] and/or dimers [-SR-Au-SR-Au-SR-]. Their preferential formation and chemical robustness are proposed as being associated with high stability due to geometric factors, while the Au-thiolate interface takes on common motifs regardless of the underlying Au core.
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U2 - 10.1021/ja8005379
DO - 10.1021/ja8005379
M3 - Article
C2 - 18547044
AN - SCOPUS:46949109836
SN - 0002-7863
VL - 130
SP - 8608
EP - 8610
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 27
ER -