Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10276145 | Journal of Electroanalytical Chemistry | 2005 | 13 Pages |
Abstract
For the functionalisation of electrode surfaces by organic molecules, platinum substrates offer the advantage of forming stable adsorption bonds to the molecules. The chemical stability and surface coverage of several adsorbed crown ethers, 18-crown-6 (18C6), benzo-18-crown-6 (B18C6) and 4â²-amino-dibenzo-18-crown-6 (4â²-ADB18C6) and for competitive purposes methoxy-benzene, have been studied at single- and polycrystalline platinum surfaces in 0.5Â M sulphuric acid with differential electrochemical mass spectrometry (DEMS). The crown ethers adsorb chemically intact in a limited potential region between 200 and 800Â mV vs. RHE. They undergo reductive cleaving of the ether ring moieties during cathodic potential shifts down to â100Â mV. By 13CO co-adsorption and subsequent oxidative desorption, the stability and reversibility of the adsorption of the crown ethers was investigated. STM images of 4â²-ADB18C6 reveal a disordered adsorbate layer.
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
R. BuÃar, M. Nielinger, H. Baltruschat,