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Spectroelectrochemistry of Self Assembled
Monolayers of Biphenyl Ethynyl Thiols on Gold
Electrodes
Abdel Aziz Jbarah, Katrin Rößler, Heinrich Lang
and Rudolf Holze
Institut für Chemie, Technische Universität
Chemnitz, D-09107 Chemnitz
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Nyquist-plots of a gold electrode, 1 3a/Au, 3
3b/Au, 2 4/Au und 21/Au, 0.01 M
(NH4)2Fe(SO4)2/0.01 M (NH4)Fe(SO4)2 in 1 M HClO4
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0.01 M (NH4)2Fe(SO4)2/0.01 M (NH4)Fe(SO4)2 in 1 M
HClO4
Assumption 2 and 3 should yield the same SAM
after S-R-cleavage
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Assuming 3 stands upright and 1 is tilted ? a
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UV-Vis spectra of 10-5 mM of 1 in THF (a), 10-5
mM of 2 in THF (b) and 10-5 mM of 3 in THF (c),
5.0 mm cell, resolution 0.1 nm.
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3
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Tilted orientation, weaker Au-S interaction than
with 3
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More tilted or even flat orientation fits with
CDL, very weak Au-S interaction, presum-ably
R-S-R intact with corresponding orienta-tion
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Au-S-mode typical of thiolate
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• Take home
• SAMs are formed
• different compactness/thickness
• Some are tilted with respect to surface normal
• Various strengths of Au-S-interaction

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