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  • Title: Self-assembled monolayers of a bis(pyrazol-1-yl)pyridine-substituted thiol on Au(111).
    Author: Shen C, Haryono M, Grohmann A, Buck M, Weidner T, Ballav N, Zharnikov M.
    Journal: Langmuir; 2008 Nov 18; 24(22):12883-91. PubMed ID: 18950209.
    Abstract:
    Self-assembled monolayers (SAMs) of a bis(pyrazol-1-yl)pyridine-substituted thiol (bpp-SH) on Au (111)/mica were studied with scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and near-edge X-ray absorption fine structure spectroscopy (NEXAFS). Using substrates precoated with perylene-3,4,9,10-tetracarboxylic acid dianhydride (PTCDA), preparation at elevated temperatures yields highly ordered layers whose structure is described by a rectangular (5 x radical3) unit cell containing one molecule. The bis(pyrazol-1-yl)pyridine (bpp) units exhibit pi-stacking along the 112 direction, and they are tilted significantly. We conclude the three imine nitrogen atoms in the bpp headgroup adopt a trans,trans arrangement.
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