Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck (Austria).
Angew Chem Int Ed Engl. 2014 Dec 8;53(50):13794-7. doi: 10.1002/anie.201408172. Epub 2014 Oct 8.
The formation of dianions in helium nanodroplets is reported for the first time. The fullerene cluster dianions (C60)n(2-) and (C70)n(2-) were observed by mass spectrometry for n≥5 when helium droplets containing the appropriate fullerene were subjected to electron impact at approximately 22 eV. A new mechanism for dianion formation is described, which involves a two-electron transfer from the metastable He(-) ion. As well as the prospect of studying other dianions at low temperature using helium nanodroplets, this work opens up the possibility of a wider investigation of the chemistry of He(-), a new electron-donating reagent.
首次报道了氦纳米液滴中双负离子的形成。当含有适当富勒烯的氦纳米液滴在约 22 eV 的电子冲击下时，观察到富勒烯团簇双负离子 (C60)n(2-) 和 (C70)n(2-) 在 n≥5 时通过质谱法被检测到。描述了一种新的双负离子形成机制，其中涉及从亚稳态 He(-)离子转移两个电子。这项工作不仅为使用氦纳米液滴在低温下研究其他双负离子开辟了前景，而且还为更广泛地研究 He(-)这种新的电子给体试剂的化学性质开辟了可能性。
