In this work, we will present a study of the optical properties of aggregated tetrakis(p-sulfonatophenyl)porphyrin (TSPP) in different environments which can have a dramatic influence on the spectroscopic features. We will show that when the porphyrins are free to self-organize (i.e. in saturated solutions) they show two distinct photoluminescence peaks, revealing the presence of two different species, with a relative population strongly dependent on the temperature. If aggregation occurs in an environment with restricted geometry (i.e. within the nanochannels of MCM-41) it is possible to modify the spontaneous self-assembly of the molecules and, as a consequence, the relative ratio of the two emissions intensity. We will report on the possibility to induce the preferential formation of the low-energy emitting species, aiming to tune in a controlled way the emission spectrum of the aggregate. (C) 2005 Elsevier B.V. All rights reserved.

Tonizzo, A., Cerminara, M., Macchi, G., Meinardi, F., Periasamy, N., Sozzani, P., et al. (2005). Optical excitations of porphyrin J-aggregates. SYNTHETIC METALS, 155(2), 291-294 [10.1016/j.synthmet.2005.09.005].

Optical excitations of porphyrin J-aggregates

CERMINARA, MICHELE;MACCHI, GIORGIO;MEINARDI, FRANCESCO;SOZZANI, PIERO ERNESTO;TUBINO, RICCARDO
2005-11-15

Abstract

In this work, we will present a study of the optical properties of aggregated tetrakis(p-sulfonatophenyl)porphyrin (TSPP) in different environments which can have a dramatic influence on the spectroscopic features. We will show that when the porphyrins are free to self-organize (i.e. in saturated solutions) they show two distinct photoluminescence peaks, revealing the presence of two different species, with a relative population strongly dependent on the temperature. If aggregation occurs in an environment with restricted geometry (i.e. within the nanochannels of MCM-41) it is possible to modify the spontaneous self-assembly of the molecules and, as a consequence, the relative ratio of the two emissions intensity. We will report on the possibility to induce the preferential formation of the low-energy emitting species, aiming to tune in a controlled way the emission spectrum of the aggregate. (C) 2005 Elsevier B.V. All rights reserved.
Articolo in rivista - Articolo scientifico
porphyrins; photoluminescence; collective phenomena; inclusion compounds
English
291
294
4
Tonizzo, A., Cerminara, M., Macchi, G., Meinardi, F., Periasamy, N., Sozzani, P., et al. (2005). Optical excitations of porphyrin J-aggregates. SYNTHETIC METALS, 155(2), 291-294 [10.1016/j.synthmet.2005.09.005].
Tonizzo, A; Cerminara, M; Macchi, G; Meinardi, F; Periasamy, N; Sozzani, P; Tubino, R
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/2171
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