title: Photophysical properties of an unusual bichromophoric species constructed from a cyclometalated Pt(II) chromophore and a blue Bodipy-acetylacetonate species.
abstract: A Bodipy species bearing an acetyl-acetonate (acac) group, , has been prepared from a blue absorbing borondipyrromethene core bearing gallate substituted paraffin chains. Compound chelates a Pt(ii) center having an orthometalated 2-phenyl-pyridine anion (ppy) as an additional ligand, giving rise to a new bichromophoric Pt(ii)-Bodipy species, . The absorption spectra, redox behavior and photophysical properties of , and of the neutral Pt(ii) compound , containing ppy and an acac derivative as ligands, have been studied. Compounds and are used as models for the Bodipy-based and the metal-based subunits of , respectively. The (3)LC emission of is fully quenched in , whereas the Bodipy fluorescence is only weakly reduced in compared to , indicating weak interaction between the subunits. Two different charge-separated (CS) states have a role in the intercomponent excited state decays of . Notably, whereas in all the previously investigated bichromophoric metal(polypyridine)-Bodipy compounds, the light absorbed by the metal-based unit leads to population of the lowest-energy triplet Bodipy-based level, in it contributes with high efficiency (>99%) to the Bodipy fluorescence. An efficient and formally forbidden (3)LC to (1)Bodipy energy transfer occurring by Förster mechanism is, unprecedently, the dominant (3)LC decay process in .
authors: Dipartimento di Scienze Chimiche, Università di Messina, and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (Fotosintesi Artificiale, SOLAR-CHEM), 98166 Messina, Italy. fnastasi@unime.it.
authors: Francesco
authors: F
authors: Nastasi
authors: Fausto
authors: F
authors: Puntoriero
authors: Scolastica
authors: S
authors: Serroni
authors: Sebastiano
authors: S
authors: Campagna
authors: Jean-Hubert
authors: JH
authors: Olivier
authors: Raymond
authors: R
authors: Ziessel