Infrared and Raman spectra of thin solid films of 1,2-bis(propylimido perylene) ethane

The synthesis, the fabrication of thin solid films, the vibrational spectra and the surface-enhanced resonance Raman scattering (SERRS) of a member of a new series of bisperylene materials: 1,2-bis(propylimido perylene) ethane (Pr(2)et) are reported. The objective of the present work was to study the fabrication of submicron evaporated thin solid films of this high molecular weight perylene dye. Transmission and reflection-absorption infrared spectroscopy were used to determine the molecular organisation of the vacuum evaporated nanometric films formed on dielectric and metallic substrates. The electronic absorption and emission spectra are discussed. The vibrational assignment of characteristic wavenumbers is proposed based on experimental data and aided with semi-empirical quantum chemical calculations. The SERRS allows the observation of vibrational fundamentals as well as combinations and overtones. (C) 1999 Elsevier Science B.V. All rights reserved.