Spectroscopy uncovers geometry and bonding in Au2H2 cluster, suggesting insights into chemical interactions.
The geometry and chemical bonding of Au₂H₂-/0 have been investigated by using photoelectron velocity map imaging spectroscopy and theoretical calculations. The Au₂H₂⁻ cluster adopts a distorted Y-shaped structure, featuring one H atom bridging two Au atoms and another H atom terminally bonded to one Au atom. The unusually low frequency of the Au-H stretching vibration observed in the current spectrum can be attributed to the delocalized 3c-2e bonding interaction associated with a bridging H atom as well as the synergistic donation and back-donation interactions between the two AuH subunits.
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Li et al. (2025) studied this question.
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