Self-Assembled Ruthenium(II)Porphyrin-Aluminium(III)Porphyrin-Fullerene Triad for Long-Lived Photoinduced Charge Separation

The Journal of Physical Chemistry. a
Agnese AmatiElisabetta Iengo

Abstract

A very efficient metal-mediated strategy led, in a single step, to a quantitative construction of a new three-component multichromophoric system containing one fullerene monoadduct, one aluminium(III) monopyridylporphyrin, and one ruthenium(II) tetraphenylporphyrin. The Al(III) monopyridylporphyrin component plays the pivotal role in directing the correct self-assembly process and behaves as the antenna unit for the photoinduced processes of interest. A detailed study of the photophysical behavior of the triad was carried out in different solvents (CH2Cl2, THF, and toluene) by stationary and time-resolved emission and absorption spectroscopy in the pico- and nanosecond time domains. Following excitation of the Al-porphyrin, the strong fluorescence typical of this unit was strongly quenched. The time-resolved absorption experiments provided evidence for the occurrence of stepwise photoinduced electron and hole transfer processes, leading to a charge-separated state with reduced fullerene acceptor and oxidized ruthenium porphyrin donor. The time constant values measured in CH2Cl2for the formation of charge-separated state Ru-Al+-C60-(10 ps), the charge shift process (Ru-Al+-C60-→ Ru+-Al-C60-), where a hole is transferred from Al-...Continue Reading

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Citations

Sep 5, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Joana I T CostaAugusto C Tomé
Mar 14, 2019·Inorganic Chemistry·Agnese AmatiElisabetta Iengo

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