NDLI: Monolayers of trimesic and isophthalic acid on Cu and Ag: the influence of coordination strength on adsorption geometry

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Monolayers of trimesic and isophthalic acid on Cu and Ag: the influence of coordination strength on adsorption geometry

Content Provider	Royal Society of Chemistry (RSC)
Author	Cebula, Izabela Lu, Hao Zharnikov, Michael Buck, Manfred
Copyright Year	2013
Abstract	Self-assembled monolayers (SAMs) of isophthalic acid (IPA) and trimesic acid (TMA) were prepared from solution using Au(111)/mica substrates modified by underpotential deposition (UPD) of Cu and Ag. Ex situ analysis by scanning tunneling microscopy (STM), synchrotron based X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy reveals pronouncedly different film structures for the (1 × 1) Cu and (1 × 1) Ag UPD-modified Au(111)/mica substrates. On Cu, both IPA and TMA form highly crystalline commensurate layers with a characteristic row structure, a significant tilt of the aromatic ring by ∼50° from the surface normal and a bipodal adsorption geometry of the molecules involving two carboxylate moieties. In contrast, a significantly smaller tilt angle of ∼20° and a monopodal adsorption geometry is found on Ag. Even though a row structure is also observed for TMA on Ag, it lacks the regularity and, thus, commensurability found on Cu. Contrasting the other systems which yield molecularly resolved STM images, no lateral order is seen in the IPA SAMs despite the fact that both the IPA and TMA layers on Ag have analogous structures with essentially the same tilt angle of the benzene ring. The difference between IPA and TMA on Ag is explained by the difference in the number of carboxyl groups available for stabilising the layer via intermolecular hydrogen bonds.
Starting Page	4455
Ending Page	4464
Page Count	10
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	4
Issue Number	12
Journal	Chemical Science
DOI	10.1039/c3sc52137k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Underpotential deposition TMA X-ray absorption fine structure Photoemission spectroscopy Scanning tunneling microscope Normal (geometry) Molecular geometry Isopropyl alcohol Cu Adsorption Carboxylic acid Benzene Self-assembled monolayer Synchrotron Mica X-ray photoelectron spectroscopy Trimethoxyamphetamine Hydrogen bond
Content Type	Text
Resource Type	Article
Subject	Chemistry

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