Intermixed adatom and surface-bound adsorbates in regular self-assembled monolayers of racemic 2-butanethiol on Au(111)

Publication Type:
Journal Article
ChemPhysChem, 2015, 16 (5), pp. 928 - 932
Issue Date:
Filename Description Size
Thumbnailcpc15-oyjagtmnzthru15-racemic-2butanethiol.pdfPublished Version4.35 MB
Adobe PDF
Full metadata record
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. In situ scanning tunneling microscopy combined with density functional theory molecular dynamics simulations reveal a complex structure for the self-assembled monolayer (SAM) of racemic 2-butanethiol on Au(111) in aqueous solution. Six adsorbate molecules occupy a (10×√3)R30 cell organized as two RSAuSR adatom-bound motifs plus two RS species bound directly to face-centered-cubic and hexagonally close-packed sites. This is the first time that these competing head-group arrangements have been observed in the same ordered SAM. Such unusual packing is favored as it facilitates SAMs with anomalously high coverage (30 %), much larger than that for enantiomerically resolved 2-butanethiol or secondary-branched butanethiol (25 %) and near that for linear-chain 1-butanethiol (33 %).
Please use this identifier to cite or link to this item: