Ethers on Si(001): A prime example for the common ground between surface science and molecular organic chemistry

Lisa Pecher, Slimane Laref, Marc Raupach, Ralf Ewald Tonner

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Using computational chemistry, we show that the adsorption of ether molecules on Si(001) under ultra-high vacuum conditions can be understood with textbook organic chemistry. The two-step reaction mechanism of (1) dative bond formation between the ether oxygen and a Lewis acidic surface atom and (2) a nucleophilic attack of a nearby Lewis basic surface atom is analysed in detail and found to mirror the acid-catalysed ether cleavage in solution. The O-Si dative bond is found to be the strongest of its kind and reactivity from this state defies the Bell-Evans-Polanyi principle. Electron rearrangement during the C-O bond cleavage is visualized using a newly developed bonding analysis method, which shows that the mechanism of nucleophilic substitutions on semiconductor surfaces is identical to molecular chemistry SN2 reactions. Our findings thus illustrate how the fields of surface science and molecular chemistry can mutually benefit and unexpected insight can be gained.
Original languageEnglish (US)
Pages (from-to)15150-15154
Number of pages5
JournalAngewandte Chemie International Edition
Volume56
Issue number47
DOIs
StatePublished - Sep 15 2017

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