Y. Negishi, N. K. Chaki, Yukatsu Shichibu
Aug 23, 2007
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Journal
Journal of the American Chemical Society
Abstract
The present work aims to test the validity of the electronic shell model for Au25(SC6H13)18 by monitoring the charge state of the Au:S core and thereby to elucidate the origin of magic stability. Electrospray ionization mass spectrometry revealed that the Schiffrin method yields [Au25(SC6H13)18]x with a distribution of charge states, which shifts toward negative values with reduction time. The stable ions [Au25(SC6H13)18]1+ and [Au25(SC6H13)18]1- can be synthesized by chemical oxidation and reduction of [Au25(SC6H13)18]0, respectively. These findings lead us to conclude that electronic shell closing is not a crucial factor for the high stability of [Au25(SC6H13)18]x (x = 1−, 0, 1+). We ascribe magic stability to the core-in-cage structure predicted theoretically.