Photophysical properties of an unusual bichromophoric species constructed from a cyclometalated Pt(ii) chromophore and a blue Bodipy-acetylacetonate species

Francesco Nastasi, Fausto Puntoriero, Scolastica Serroni, Sebastiano Campagna, Jean Hubert Olivier, Raymond Ziessel

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A Bodipy species bearing an acetyl-acetonate (acac) group, 3, has been prepared from a blue absorbing borondipyrromethene core bearing gallate substituted paraffin chains. Compound 3 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, 1. The absorption spectra, redox behavior and photophysical properties of 1, 3 and of the neutral Pt(ii) compound 2, containing ppy and an acac derivative as ligands, have been studied. Compounds 3 and 2 are used as models for the Bodipy-based and the metal-based subunits of 1, respectively. The 3LC emission of 2 is fully quenched in 1, whereas the Bodipy fluorescence is only weakly reduced in 1 compared to 3, indicating weak interaction between the subunits. Two different charge-separated (CS) states have a role in the intercomponent excited state decays of 1. 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 1 it contributes with high efficiency (>99%) to the Bodipy fluorescence. An efficient and formally forbidden 3LC to 1Bodipy energy transfer occurring by Förster mechanism is, unprecedently, the dominant 3LC decay process in 1. This journal is

Original languageEnglish (US)
Pages (from-to)17647-17658
Number of pages12
JournalDalton Transactions
Issue number47
StatePublished - Dec 21 2014


ASJC Scopus subject areas

  • Inorganic Chemistry

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