The optical spectra of bis (phenethylimido) perylene (PhPTCD) are discussed. Surface- pressure area isotherms of floating Langmuir monomolecular layers have been obtained, and Langmuir–Blodgett (LB) molecular monolayers of the material have been fabricated on silver island substrates for surface-enhanced vibrational studies. The electronic absorption and emission spectra of solutions and thin solid films are described. The vibrational ...