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  • Title: Photophysical properties of an unusual bichromophoric species constructed from a cyclometalated Pt(II) chromophore and a blue Bodipy-acetylacetonate species.
    Author: Nastasi F, Puntoriero F, Serroni S, Campagna S, Olivier JH, Ziessel R.
    Journal: Dalton Trans; 2014 Dec 21; 43(47):17647-58. PubMed ID: 25055956.
    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 .
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