Reactivity of self-assembled monolayers: formation of organized amino functionalities

Literature Information

Publication Date 2000-03-08
DOI 10.1039/A909589F
Impact Factor 3.676
Authors

Oliver Dannenberger, Klaus Weiss, Christof Wöll, Manfred Buck


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Abstract

The reactivity of self-assembled monolayers (SAMs) of mercaptodocosanol (MDO) on gold has been screened by a variety of wet chemical reactions. Changes in thickness and composition were monitored using X-ray photoelectron spectroscopy (XPS). The order and tilt angles were studied using near-edge X-ray absorption fine structure spectroscopy (NEXAFS). Sulfonyl chlorides could not be reacted to form sulfonates, and p-toluenesulfonyl chloride (TosCl) at longer reaction times even resulted in a partial desorption of the alkanethiol film. A coupling reaction of silanes to the hydrophilic surface was very much dependent on the reagent. Whereas chlorodimethylphenylsilane (CPS) at elongated reaction times leads to an almost complete removal of the monolayer, p-aminophenyltrimethoxysilane (APTS) attaches to the OH terminated surface. From the orientation analysis a broad distribution of tilt angles of the aromatic moiety is concluded. Attachment of the APTS moieties induces disorder in the thiol layer. The average tilt angle of the hydrocarbon chains of the MDO layer changes from 30° for the unperturbed, well-ordered layer to 44° for the reacted film and indicates an increasing number of gauche conformations.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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