Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 59: Poster Session III (Nanotribology; Polymeric biomolecular films; Organic electronics and photovoltaics, Covalent networks on surfaces; Phase transitions; Particles and clusters; Transparent conductive oxides)

O 59.6: Poster

Wednesday, March 16, 2011, 17:30–21:00, P3

Self-assembly of pyridine-substituted alkanehiols on gold — •Hicham Hamoudi¹, Katrin Döring², Heinrich Lang², and Michael Zharnikov¹ — ¹Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany — ²Lehrstuhl für Anorganische Chemie, Technische Universität Chemnitz, Straße der Nationen 62, 09111 Chemnitz, Germany

High-resolution X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy, and infrared reflection absorption spectroscopy were used to study the properties of SAMs of aminomethyl-di(2-pyridyl)-11-mercaptoundecanamide (C10AP1), 4-(aminomethyl)pyridine-11-mercaptoundecanamide (C10AP2), and 2-(aminomethyl)pyridine-11-mercaptoundecanamide (C10AP3) prepared on Au(111) substrates. Whereas all molecules formed well-defined SAMs, their structural and electronic properties were found to be noticeably different depending on (i) either ortho- or para-attachment of the terminal pyridine moiety to the molecular chain and (ii) the number of the pyridine units in the tail group. The highest order was found in the C10AP3 SAM where the alignment of the SAM constituents seemed to be additionally strengthened by intramolecular interaction. Further, the branching of the characteristic pre-edge absorption resonances in the C K-edge spectra of the SAMs is distinctly different for the cases of the ortho- or para-attachment of pyridine, which could be explained by the different coupling of the electronic and vibrational excitations in both cases.