As it has been already introduced, BOPHY molecules are excellent photoactive molecules for the development of improved photoelectrodes. Thus, the so-formed high quality BOPHY-based metal-organic oligomers could be of great interest in photo(electro)catalytic applications. However, these are prepared under ideal UHV conditions, far from real applications. If these nanostructures are to applied, it becomes crucial to investigate, first of all, their air-stability (usually known as bridging the pressure gap). For this purpose, we have followed the air stability of these oligomers on both substrates, Au(111) and Ag(111), by XPS, acquiring spectra before and after a 10 min exposure to air and a subsequent post-annealing at 370 K to desorb possible physisorbed contaminants and check the stability of the products.