Abstract:
Vibronic properties of organic semiconductors based on tert-butyl substituted phthalocyanine lutetium diphthalocyanine molecules are studied by IR and Raman spectroscopy. It is shown that substitution of several carbon atoms in initial phthalocyanine (Pc) ligands with $^{13}$C isotope atoms causes a spectral shift in the main absorption lines attributed to benzene, isoindol, and peripheral C–H groups. A comparison of spectral characteristics showed that the shift can vary from 3 to 1 cm$^{-1}$.