Metastability of gold-carbonyl cluster complexes, Au N(CO)
M
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| Authors: | WT Wallace RL Whetten |
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| Institution: | (1) School of Chemistry and Biochemistry, Georgia Institute of Technology Atlanta, GA 30332-0400, USA, GE;(2) School of Physics Georgia Institute of Technology, Atlanta, GA 30332-0430, USA, GE |
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| Abstract: | Smaller gold-cluster anions, typified by Au
7
-
, adsorb multiple CO molecules in a high-pressure, room-temperature flow-reactor, tending toward previously unknown saturation
compositions, Au7(CO)
4
-
. The weakness of the gold-carbonyl adsorption bond is evidenced indirectly by the high CO partial pressure required and more
directly by the high probability of fragmentation in the field-free flight region of the reflectron-type time-of-flight mass
spectrometer. The analysis of this metastability reveals that the actual distribution fN,M of products Au7(CO)
M
-
in the reactor may be highly non-statistical, e.g. with only even-M species present.
Received 17 April 2001 |
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| Keywords: | PACS 61 46 +w Nanoscale materials: clusters nanoparticles nanotubes and nanocrystals – 36 40 Jn Reactivity of clusters – 36 40 Wa Charged clusters – 82 33 Hk Reactions on clusters |
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