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Complexes with Atomic Gold Ions: Efficient Bis-Ligand Formation
oleh: Felix Duensing, Elisabeth Gruber, Paul Martini, Marcelo Goulart, Michael Gatchell, Bilal Rasul, Olof Echt, Fabio Zappa, Masoomeh Mahmoodi-Darian, Paul Scheier
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2021-06-01 |
Deskripsi
Complexes of atomic gold with a variety of ligands have been formed by passing helium nanodroplets (HNDs) through two pickup cells containing gold vapor and the vapor of another dopant, namely a rare gas, a diatomic molecule (H<sub>2</sub>, N<sub>2</sub>, O<sub>2</sub>, I<sub>2</sub>, P<sub>2</sub>), or various polyatomic molecules (H<sub>2</sub>O, CO<sub>2</sub>, SF<sub>6</sub>, C<sub>6</sub>H<sub>6</sub>, adamantane, imidazole, dicyclopentadiene, and fullerene). The doped HNDs were irradiated by electrons; ensuing cations were identified in a high-resolution mass spectrometer. Anions were detected for benzene, dicyclopentadiene, and fullerene. For most ligands L, the abundance distribution of AuL<i><sub>n</sub></i><sup>+</sup> versus size <i>n</i> displays a remarkable enhancement at <i>n</i> = 2. The propensity towards bis-ligand formation is attributed to the formation of covalent bonds in Au<sup>+</sup>L<sub>2</sub> which adopt a dumbbell structure, L-Au<sup>+</sup>-L, as previously found for L = Xe and C<sub>60</sub>. Another interesting observation is the effect of gold on the degree of ionization-induced intramolecular fragmentation. For most systems gold enhances the fragmentation, i.e., intramolecular fragmentation in AuL<i><sub>n</sub></i><sup>+</sup> is larger than in pure L<i><sub>n</sub></i><sup>+</sup>. Hydrogen, on the other hand, behaves differently, as intramolecular fragmentation in Au(H<sub>2</sub>)<i><sub>n</sub></i><sup>+</sup> is weaker than in pure (H<sub>2</sub>)<i><sub>n</sub></i><sup>+</sup> by an order of magnitude.