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Applications, Properties and Synthesis of ω-Functionalized n-Alkanethiols and Disulfides - the Building Blocks of Self-Assembled Monolayers

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Self-assembled monolayers (SAMs) of alkane thiols on gold and other metals are versatile constructs with which to study interfacial phenomena and reactions at surfaces. Surface properties of SAMs - e.g., wettability, stability in diverse environments, propensity to interact with or to resist adsorption of macromolecules -- depend on and can be controlled flexibly by the properties of the functional (head) groups in the w position of the alkyl chain. SAMs provide a basis for many important scientific and technological applications, ranging from micropatterning methods, through sensing, to biological recognition. Despite their importance, the literature on SAMs and the synthesis of molecules that constitute them remains scattered and often conflicting. The purpose of this Review is (i) to summarize the applications and physical properties of SAMs and (ii) to systematize the strategies of synthesis of ω-functionalized alkane thiols. Generic retrosynthetic scheme is developed that allows efficient synthetic planning. Issues related to the selection of appropriate protecting groups and the ways of introduction of the thiol functionality are discussed in detail, and illustrated with examples of syntheses of several complex alkane thiols.
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Keywords: generic retrosynthetic scheme; micropatterning methods; n-alkanethiols

Document Type: Review Article

Affiliations: Northwestern University,Dept. of Chemical & Biological Eng. 2145 Sheridan Rd. Evanston IL 06208 USA.

Publication date: 01 December 2004

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