Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 47: Organic films IV

O 47.7: Talk

Friday, March 31, 2006, 12:45–13:00, PHY C213

Aromatic selenolates as an attractive alternative to the respective thiolates — •Andrey Shaporenko¹, Piotr Cyganik², Manfred Buck², Andreas Terfort³, and Michael Zharnikov¹ — ¹Angewandte Physkalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany — ²School of Chemistry, St Andrews University, North Haugh, St Andrews, KY16 9ST, United Kingdom — ³Anorganische und Angewandte Chemie, Universität Hamburg, 20146 Hamburg, Germany

Self-assembled monolayers (SAMs) formed from bisbiphenyl-4-yl diselenide (BBPDSe) on Au(111) and Ag(111) substrates have been characterized by several complementary spectroscopic and microscopic techniques. BBPDSe was found to form contamination-free, densely-packed, and well-ordered biphenyl selenolate (BPSe) SAMs on both Au and Ag. Spectroscopic data suggest very similar packing density, orientational order, and molecular inclination in BPSe/Au and BPSe/Ag. STM data give a similar intermolecular spacing of 5.3 Å on both Au and Ag, but exhibit differences in the exact arrangement of the BPSe molecules on these two substrates. There is strong evidence for adsorbate-mediated substrate restructuring in the case of Au, whereas no clear statement on this issue can be made in the case of Ag. The film quality of the BPSe SAMs is superior to their thiolate analogues, which is presumably related to a better ability of the selenolates to adjust the surface lattice of the substrate to the most favorable 2D arrangement of the adsorbate molecules. This implies that aromatic selenolates represent an attractive alternative to the respective thiolates.