We report on the efficient use of different coordinative affinities to quantitatively construct a three-component multichromophore system containing one free-base porphyrin, one aluminium(III) monopyridylporphyrin, and one ruthenium(II) tetraphenylporphyrin in a single step. The AlIII monopyridylporphyrin plays the pivotal role in directing the correct self-assembly process, and it behaves as the antenna unit for the photoinduced processes of interest. A two-component system, containing the same free-base porphyrin and one aluminium(III) tetraphenylporphyrin, was prepared for comparative studies. Both systems are remarkably stable in chlorinated solutions. Their photophysical behaviour was studied in detail by stationary and time-resolved emission techniques. In the two-component system, fast and efficient singlet energy transfer from the Al-porphyrin to the free-base porphyrin is observed; in the three-component system, upon excitation of the Al-porphyrin, a fast (<250 ps) electron transfer process from the Ru-porphyrin to the aluminium-porphyrin is observed. A metal-mediated strategy was successfully used to construct a two- and a three-component multichromophore system; the photophysics of these self-assembled systems were investigated by emission techniques. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
A Selective Metal-Mediated Approach for the Efficient Self-Assembling of Multi-Component Photoactive Systems
INDELLI, Maria Teresa
2014
Abstract
We report on the efficient use of different coordinative affinities to quantitatively construct a three-component multichromophore system containing one free-base porphyrin, one aluminium(III) monopyridylporphyrin, and one ruthenium(II) tetraphenylporphyrin in a single step. The AlIII monopyridylporphyrin plays the pivotal role in directing the correct self-assembly process, and it behaves as the antenna unit for the photoinduced processes of interest. A two-component system, containing the same free-base porphyrin and one aluminium(III) tetraphenylporphyrin, was prepared for comparative studies. Both systems are remarkably stable in chlorinated solutions. Their photophysical behaviour was studied in detail by stationary and time-resolved emission techniques. In the two-component system, fast and efficient singlet energy transfer from the Al-porphyrin to the free-base porphyrin is observed; in the three-component system, upon excitation of the Al-porphyrin, a fast (<250 ps) electron transfer process from the Ru-porphyrin to the aluminium-porphyrin is observed. A metal-mediated strategy was successfully used to construct a two- and a three-component multichromophore system; the photophysics of these self-assembled systems were investigated by emission techniques. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
