Electrochemical detection of electrochemically inactive cations by self-assembled monolayers of crown ethers

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Flink, Simon and Boukamp, Bernard A. and Berg van den, Albert and Veggel van, Frank C.J.M. and Reinhoudt, David N. (1998) Electrochemical detection of electrochemically inactive cations by self-assembled monolayers of crown ethers. Journal of the American Chemical Society, 120 (19). pp. 4652-4657. ISSN 0002-7863

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Abstract:Self-assembled monolayers (SAMs) of 2-[(6-mercaptohexyl)oxy]methyl-12-crown-4 (1) and 2-[(6-mercaptohexyl)oxy]methyl-15-crown-5 (2) on gold are able to bind cations reversibly from aqueous solutions. This binding of the electrochemically inactive cations is monitored by cyclic voltammetry and impedance spectroscopy using the redox couple Ru(NH3)62+/3+ as "reporter ion". Gold electrodes modified with 1 detect Na+ even in the presence of a 100-fold excess of K+; SAMs of 2 are K+ selective. As a result of the high surface density of crown ethers, sandwich complexes are formed. Reduced surface concentrations of receptors in mixed monolayers of 2 with heptanethiol prevent the sandwich complexation and decreases the K+/Na+ selectivity of the SAM.
Item Type:Article
Copyright:© 1998 American Chemical Society
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Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/10993
Official URL:http://dx.doi.org/10.1021/ja9734713
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Metis ID: 105940