We have studied the assembly process of a film of small boronic molecules (tetrahydroxy diborane) on Au(111) and Cu(111) surfaces under ultra high vacuum condition. By means of X-ray photoelectron spectroscopy (XPS) we found that a condensation reaction takes place, leading to the formation of extended, covalently bounded architectures. On Au(111), the angular resolved ultraviolet photoelectron spectroscopy (ARUPS), reveals the presence of a dispersion of valence band peaks of the boronic assembly, indicating a possible and promising employment of the system as electrode in electronic devices. The morphology of the boronic-gold hybrid interface has been investigated by means of near edge X-ray absorption fine structure (NEXAFS), that indicates a flat adsorption geometry for the boroxine rings of the film. On the contrary, the film grown on Cu(111) shows no dispersion, possibly due to a stronger boroxine-metal interaction.