novel molecular dyad, 1, made of a dinuclear {[Re2(mu-X)(2)(CO)(6)(mu-pyridazine)]} component covalentlylinked to a fullerene unit by a carbocyclic molecular bridge has been prepared and its redox, spectroscopic, and photophysical properties -including pump-probe transient absorption spectroscopy in the visible and near-infrared region -have been investigated, along with those of its model species. Photoinduced, intercomponent electron transfer occurs in 1 from the thermally-equilibrated, triplet metal/ligand-to-ligand charge-transfer ((MLLCT)-M-3) state of the dinuclear rhenium(I) subunit to the fullerene acceptor, with a time constant of about 100 ps. The so-formed triplet charge-separated state recombines in a few nanoseconds by a spin-selective process yielding, rather than the ground state, the locally-excited, triplet fullerene state, which finally decays to the ground state by intersystem crossing in about 290 ns.

Photoinduced intercomponent excited-state decays in a molecular dyad made of a dinuclear rhenium(I) chromophore and a fullerene electron acceptor unit / F. Nastasi, F. Puntoriero, M. Natali, M. Mba,M. Maggini, P. Mussini, M. Panigati, S. Campagna. - In: PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES. - ISSN 1474-905X. - 14:5(2015 Feb 12), pp. 909-918. [10.1039/c4pp00301b]

Photoinduced intercomponent excited-state decays in a molecular dyad made of a dinuclear rhenium(I) chromophore and a fullerene electron acceptor unit

P. Mussini;M. Panigati
Penultimo
;
2015

Abstract

novel molecular dyad, 1, made of a dinuclear {[Re2(mu-X)(2)(CO)(6)(mu-pyridazine)]} component covalentlylinked to a fullerene unit by a carbocyclic molecular bridge has been prepared and its redox, spectroscopic, and photophysical properties -including pump-probe transient absorption spectroscopy in the visible and near-infrared region -have been investigated, along with those of its model species. Photoinduced, intercomponent electron transfer occurs in 1 from the thermally-equilibrated, triplet metal/ligand-to-ligand charge-transfer ((MLLCT)-M-3) state of the dinuclear rhenium(I) subunit to the fullerene acceptor, with a time constant of about 100 ps. The so-formed triplet charge-separated state recombines in a few nanoseconds by a spin-selective process yielding, rather than the ground state, the locally-excited, triplet fullerene state, which finally decays to the ground state by intersystem crossing in about 290 ns.
intramolecualar energy-transfer; ligand charge-transfer; bridging 1,2-diazine ligands; metal-complexes; electrochemical properties; photophysical properties; polypyridyl compelxes; infrared-spectroscopy; carbon-dioxide; photochemistry
Settore CHIM/03 - Chimica Generale e Inorganica
Settore CHIM/06 - Chimica Organica
12-feb-2015
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/320864
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