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.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics