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 Soret band of the molecule, the optical spectral line 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 pi orbitals of the porphyrin macrocycles.

Thickness Dependence of the Optical Anisotropy for Porphyrin Octaester Langmuir-Schaefer Films / Goletti, C.; Paolesse, R.; Dalcanale, Enrico; Berzina, T.; DI NATALE, C.; Bussetti, G.; Chiaradia, P.; Froiio, A.; Cristofolini, Luigi; Costa, Mirco. - In: LANGMUIR. - ISSN 0743-7463. - 18:18(2002), pp. 6881-6886. [10.1021/la0257561]

Thickness Dependence of the Optical Anisotropy for Porphyrin Octaester Langmuir-Schaefer Films

DALCANALE, Enrico;CRISTOFOLINI, Luigi;COSTA, Mirco
2002

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 Soret band of the molecule, the optical spectral line 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 pi orbitals of the porphyrin macrocycles.
Thickness Dependence of the Optical Anisotropy for Porphyrin Octaester Langmuir-Schaefer Films / Goletti, C.; Paolesse, R.; Dalcanale, Enrico; Berzina, T.; DI NATALE, C.; Bussetti, G.; Chiaradia, P.; Froiio, A.; Cristofolini, Luigi; Costa, Mirco. - In: LANGMUIR. - ISSN 0743-7463. - 18:18(2002), pp. 6881-6886. [10.1021/la0257561]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/1452022
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