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Electroactive self-assembled monolayers on gold via bipodal dithiazepane anchoring groups
Paul A Bertin1, Dimitra Georganopoulou, Taiyang Liang
1Ohmx Corporation, Evanston, Illinois 60201, USA. paul@ohmx.com
Langmuir : the ACS Journal of Surfaces and Colloids
|July 17, 2008
Summary
Novel ferrocene oligomers functionalized with dithiazepane were synthesized and formed stable monolayers on gold. These dithiazepane-bridged redox species show promise for molecular wire applications.
Area of Science:
- Organometallic Chemistry
- Electrochemistry
- Materials Science
Background:
- Ferrocene derivatives are widely studied for their redox properties.
- Self-assembled monolayers (SAMs) offer a platform for organizing molecules at surfaces.
- Molecular wires require stable anchoring and efficient charge transport.
Purpose of the Study:
- To synthesize novel dithiazepane-functionalized ferrocenyl-phenylethynyl oligomers.
- To investigate the formation and electrochemical properties of SAMs composed of these oligomers.
- To assess their potential as components for molecular wires.
Main Methods:
- Synthesis of dithiazepane-functionalized ferrocenyl-phenylethynyl oligomers.
- Formation of self-assembled monolayers (SAMs) on gold electrodes.
- Characterization using X-ray photoelectron spectroscopy (XPS), ellipsometry, and cyclic voltammetry (CV).
Main Results:
- Successful synthesis of two novel oligomers (1 and 2).
- XPS confirmed the presence of gold-thiolate species in SAMs, indicating successful anchoring.
- CV demonstrated stable electroactive monolayers, with improved performance in two-component SAMs.
Conclusions:
- Dithiazepane-anchored ferrocene oligomers form stable SAMs on gold.
- These molecules exhibit promising electrochemical stability and redox behavior.
- Dithiazepane-bridged redox species are suitable candidates for future molecular wire research.
