Abstract: Different self-assembled thiol-substituted porphyrin monolayers(TPPS1 and TPPS4) were prepared and characterized by means of UV-Vis, CV, EIS and XPS. The results showed that the self-assembled porphyrin monolayers have different configurations due to the different numbers of the thiol-substitute in porphyrin molecules. Therefore, these porphyrin monolayers showed different performance in catalysis. On the basis of those observations, we proposed a model for the assembling of multi-thiol substituted porphyrin into monolayer. The established method shows potential for building and developing functional self-assembled porphyrin monolayers in the application of bio-catalysis and optoelectronic devices.

Key words: multi-thiol substituted porphyrin compounds, self-assembled monolayer, preparation and characterization, model