Goulart Marcelo, Gatchell Michael, Kranabetter Lorenz, Kuhn Martin, Martini Paul, Gitzl Norbert, Rainer Manuel, Postler Johannes, Scheier Paul, Ellis Andrew M
Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria.
Phys Chem Chem Phys. 2018 Apr 4;20(14):9554-9560. doi: 10.1039/c8cp01273c.
Adducts formed between small gold cluster cations and helium atoms are reported for the first time. These binary ions, Aun+Hem, were produced by electron ionization of helium nanodroplets doped with neutral gold clusters and were detected using mass spectrometry. For a given value of n, the distribution of ions as a function of the number of added helium atoms, m, has been recorded. Peaks with anomalously high intensities, corresponding to so-called magic number ions, are identified and interpreted in terms of the geometric structures of the underlying Aun+ ions. These features can be accounted for by planar structures for Aun+ ions with n ≤ 7, with the addition of helium having no significant effect on the structures of the underlying gold cluster ions. According to ion mobility studies and some theoretical predictions, a 3-D structure is expected for Au8+. However, the findings for Au8+ in this work are more consistent with a planar structure.
首次报道了在小金团簇阳离子与氦原子之间形成的加合物。这些二元离子Aun+Hem是通过对掺杂有中性金团簇的氦纳米液滴进行电子电离产生的，并使用质谱法进行检测。对于给定的n值，已记录了离子分布随添加氦原子数m的变化情况。识别出了对应于所谓幻数离子的异常高强度峰，并根据底层Aun+离子的几何结构进行了解释。对于n≤7的Aun+离子，这些特征可以用平面结构来解释，氦的添加对底层金团簇离子的结构没有显著影响。根据离子迁移率研究和一些理论预测，预计Au8+具有三维结构。然而，这项工作中Au8+的研究结果更符合平面结构。
