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Self-Assembly of Aromatic Nitroso Compounds Terminated with Thiocynate Group on Gold Surfaces

Self-assembled monolayers (SAMs) of organic compounds are extensively investigated for potential applications in areas ranging from molecular-based electronic and optical devices to biorecognition sensors.1 Aromatic nitroso compounds are photochemicaly very interesting materials with various potential application because of photochromic properties observed in these compounds.2 The aim of this work is preparation and characterization of self-assembled monolayers of aromatic nitroso compounds functionalized with thiocynate end groups needed for adsorption on gold surface.3 In order to achieve this goal, we have prepared compounds of general formula 1 with various chain lengths. Self-assembled monolayers of these compounds were prepared by immersing clean Au(100) surface in 1mM ethanolic solution of 1 for 24 h. Thus obtained SAMs were characterized by FT-Raman spectroscopy. In contrast to the spectra of neat compound 1, in Raman spectra of 1 self-assembled on Au(100), no SCN stretching peak is observed. This confirms the cleavage of the S-CN bond upon formation of S-Au bond. Further characterizations of prepared SAMs are under way.

self-assembly; aromatic nitroso compounds; gold; gold surface

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