Abstract
STM was used to characterize the Au(111) surface modified by a mixed layer of 2-mercaptopyrimidine and 1,10′-phenanthroline. A study of the single layers was also carried out in order to compare with the mixed layer formed by the molecules. The coadsorbed molecules adopt an adsorption mode similar to that of the single layer of 2-mercaptopyrimidine. This structure is a planar bidimensional assembly held together by a hydrogen bond. The phenanthroline molecules are attached to the edges of the 2-mercaptopyrimidine assembly. 1,10′-phenanthroline was found to lie flat on the surface in the mixed layer conversely to its adsorption mode in the single layer. Variations in the pH and molecular concentrations were made in the mother solutions to check their influence on the resulting modified surface. The images show that the STM is able to distinguish very clearly between the two molecules.
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