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SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, 2007 1 of 21 Spectroelectrochemistry of Self Assembled Monolayers of Biphenyl Ethynyl Thiols.

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Presentation on theme: "SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, 2007 1 of 21 Spectroelectrochemistry of Self Assembled Monolayers of Biphenyl Ethynyl Thiols."— Presentation transcript:

1 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21 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 Chemnitz

2 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21

3 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21

4 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21

5 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21 Nyquist-plots of a gold electrode, 1: 3a/Au, 3: 3b/Au, 2: 4/Au und 21/Au, 0.01 M (NH 4 ) 2 Fe(SO 4 ) 2 /0.01 M (NH 4 )Fe(SO 4 ) 2 in 1 M HClO 4

6 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of M (NH 4 ) 2 Fe(SO 4 ) 2 /0.01 M (NH 4 )Fe(SO 4 ) 2 in 1 M HClO 4 Assumption: 2 and 3 should yield the same SAM after S-R-cleavage

7 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21 Assuming: 3 stands upright and 1 is tilted → α ≈ 60°

8 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21

9 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21 UV-Vis spectra of mM of 1 in THF (a), mM of 2 in THF (b) and mM of 3 in THF (c), 5.0 mm cell, resolution 0.1 nm.

10 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21

11 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21

12 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21

13 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21 3

14 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21

15 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21 Tilted orientation, weaker Au-S interaction than with 3 1

16 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21

17 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21 More tilted or even flat orientation – fits with C DL, very weak Au-S interaction, presum- ably R-S-R intact with corresponding orienta- tion 2

18 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21

19 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21 Au-S-mode typical of thiolate 3

20 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21 Take home: SAMs are formed different compactness/thickness Some are tilted with respect to surface normal Various strengths of Au-S-interaction

21 SERS Roundtable 2007 Ellenz-Poltersdorf, October 03 – 05, of 21


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