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

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
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Biomedical and Environmental Sensor systems (BIOS)
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