The catalytic properties of gold particles that emerge when their dimensions are reduced to 10 or 20 atoms is a subject of great interest and an area of discovery. In order to obtain these sort of systems different synthetic routes have been developed. The most of them are based on sulfur mediated compounds that stabilized the final cluster providing colloidal stability. However the present of sulfur atoms in the cluster constitutes a drawback since it acts as poisoning agents for the catalytic activity. Recently our group has developed a very easy way to produce gold clusters which are stabilized with porphyrines that present two major advantages. First the synthetic process is carried out in aqueous solution and secondly sulfur atoms are not required to stabilize the synthesized gold clusters, rendering as result a system with a very high catalytic activity. In this proposal we plan to study the interactions existing in gold clusters stabilized by porphyrines. Comparing INS results with FTIR and Raman could permit to understand the interaction between the organic and the inorganic parts as well as reliable description of the vibrational properties of the gold clusters.