Controlled Synthesis of Diphosphine-Protected Gold Cluster Cations Using Magnetron Sputtering Method |
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| Authors: | Lewei Wang Tsubasa Omoda Kiichirou Koyasu Tatsuya Tsukuda |
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| Institution: | 1.Department of Chemistry, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan; (L.W.); (T.O.); (K.K.);2.Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan |
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| Abstract: | We demonstrated, for the first time, atomically precise synthesis of gold cluster cations by magnetron sputtering of a gold target onto a polyethylene glycol (PEG) solution of 1,3-bis(diphenylphosphino)propane (Ph2PCH2CH2CH2PPh2, dppp). UV-vis absorption spectroscopy and electrospray ionization mass spectrometry revealed the formation of cationic species, such as Au(dppp)n]+ (n = 1, 2), Au2(dppp)n]2+ (n = 3, 4), Au6(dppp)n]2+ (n = 3, 4), and Au11(dppp)5]3+. The formation of Au(dppp)2]+ was ascribed to ionization of Au(dppp)2 by the reaction with PEG, based on its low ionization energy, theoretically predicted, mass spectrometric detection of deprotonated anions of PEG. We proposed that Au(dppp)2]+ cations thus formed are involved as key components in the formation of the cluster cations. |
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| Keywords: | ligand-protected gold cluster magnetron sputtering atomically precise synthesis polyethylene glycol |
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