Self-assembled monolayers of a bis(pyrazol-1-yl)pyridine-substituted thiol on Au(111) |
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Authors: | Shen Cai Haryono Marco Grohmann Andreas Buck Manfred Weidner Tobias Ballav Nirmalya Zharnikov Michael |
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Institution: | EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom. |
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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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