We have studied the optical anisotropy of porphyrin layers with different thicknesses deposited onto gold substrates by the Langmuir-Schaefer technique. In coincidence with the Sorer band of the molecule, the optical spectralline shape as determined by reflectance anisotropy spectroscopy exhibits a characteristic, large structure, which changes from a "peaklike" to a "derivative-like" shape at a well-defined thickness (8-10 monolayers). We interpret this result in the framework of electronic effects due to structural changes in the layers, yielding solid-state effects originating from the coupling of the π orbitals of the porphyrin macrocycles.
Goletti, C., Paolesse, R., Dalcanale, E., Berzina, T., DI NATALE, C., Bussetti, G., et al. (2002). Thickness dependence of the optical anisotropy for porphyrin octaester Langmuir-Schaefer films. LANGMUIR, 18(18), 6881-6886 [10.1021/la025756l].
Thickness dependence of the optical anisotropy for porphyrin octaester Langmuir-Schaefer films
GOLETTI, CLAUDIO;PAOLESSE, ROBERTO;DI NATALE, CORRADO;BUSSETTI, GIANLORENZO;CHIARADIA, PIETRO;D'AMICO, ARNALDO
2002-01-01
Abstract
We have studied the optical anisotropy of porphyrin layers with different thicknesses deposited onto gold substrates by the Langmuir-Schaefer technique. In coincidence with the Sorer band of the molecule, the optical spectralline shape as determined by reflectance anisotropy spectroscopy exhibits a characteristic, large structure, which changes from a "peaklike" to a "derivative-like" shape at a well-defined thickness (8-10 monolayers). We interpret this result in the framework of electronic effects due to structural changes in the layers, yielding solid-state effects originating from the coupling of the π orbitals of the porphyrin macrocycles.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.