Indeed, the inclusion of metal salts incremented the intensity relation between the higher and lower emission energy
bands. On the other hand, Raman spectroscopy measurements performed in PDAs films derived of pentyn-1-ol indicated that the metal
salts induced a slight statistical shift in the triple and double bond signals to higher energies. In this way, the intensity variations and band
shifts detected by Raman, UV–VIS and PL spectroscopies showed that the presence of metal salts could have a remarkable influence on
the energy levels of these PDAs.