Complexes of gold and imidazole formed in helium nanodroplets

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We have studied complexes of gold atoms and imidazole (C₃N₂H₄, abbreviated Im) produced in helium nanodroplets. Following the ionization of the doped droplets we detect a broad range of different AuₘImₙ+ complexes, however we find that for specific values of m certain n are "magic" and thus particularly abundant. Our density functional theory calculations indicate that these abundant clusters sizes are partially the result of particularly stable complexes, e.g. AuIm₂+, and partially due to a transition in fragmentation patterns from the loss of neutral imidazole molecules for large systems to the loss of neutral gold atoms for smaller systems.