Title




Reactions of gold cluster cations (n = 112) with and
 
Author




 
Abstract




The reactions of gold cluster cations Aun+ (n = 112) with H2S and H2 have been studied using Fouriertransform ioncyclotron resonance (FTICR) mass spectrometry. The cluster cations were produced by laser ablation of a gold rod in He atmosphere, and their reactions were observed at room temperature and low total pressures of 10−710−5 Torr. Initial products of the reactions with H2S were mainly AuSH+ for n = 2, AunS+ for n = 48 and 10, and AunSH2+ for n = 9, 11, and 12. No reactions of Au+ and Au3+ with H2S were observed. Even n cluster cations were more reactive than adjacent odd n clusters. The particularly low reactivity at n = 1, 3, 9, and 11 is consistent with the low ionization potential of Aun and the weak binding energy of Aun+Au. Further sulfuration reactions of AunS+ proceeded to give AunSm+ and finally stopped at AunSm+xH2+ when H2 release did not occur. The maximum number of sulfur atoms m+x increased with the cluster size up to n = 8, while the sulfuration reaction stopped at early stages for n ≥ 9. In another series of experiments, no reaction of Aun+ (n = 112) with H2 gas pulses introduced into the FTICR cell was observed. To investigate the stability of gold hydride clusters, laser ablation of gold in a H2/He mixture was performed. The hydride cluster cations AunHm+ were produced for n = 17, while bare Aun+ clusters were the main products for n ≥ 8. There is a distinct border between n = 7 and 8, as the structure of Aun+ changes from planar for n ⩽ 7 to threedimensional for n ≥ 8, suggesting the stability of hydride cluster cations with planar gold frameworks. 
 
Language




Dutch
 
Source (journal)




The journal of chemical physics.  New York, N.Y.
The journal of chemical physics.  New York, N.Y.
 
Publication




New York, N.Y.
:
2003
 
ISSN




00219606
 
Volume/pages




118
:17
(2003)
, p. 78087816
 
ISI




000182276100011
 
Full text (Publisher's DOI)




 
