http://www.cnr.it/ontology/cnr/individuo/prodotto/ID51235
Excited-State Dynamics in a Dyad Comprising Terpyridine-Platinum(II) Ethynylene Linked to Pyrrolidino-[60]Fullerene (Articolo in rivista)
- Type
- Label
- Excited-State Dynamics in a Dyad Comprising Terpyridine-Platinum(II) Ethynylene Linked to Pyrrolidino-[60]Fullerene (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/ic900069r (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- B. Ventura; A. Barbieri; A. Zanelli; F. Barigelletti; J. Batcha Seneclauze; S. Diring; R. Ziessel (literal)
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- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- 1. CNR, ISOF, I-40129 Bologna, Italy
2. Univ Strasbourg, Lab Chim Organ & Spect Avancees, ECPM, F-67087 Strasbourg 02, France (literal)
- Titolo
- Excited-State Dynamics in a Dyad Comprising Terpyridine-Platinum(II) Ethynylene Linked to Pyrrolidino-[60]Fullerene (literal)
- Abstract
- A hybrid [Pt((t)Bu(3)terpy)(C C-Ph-C(60))](+) Complex (Pt-Fu) wherein a phosphorescent platinum center is linked to fullerene has been prepared using a copper(I)-promoted cross-coupling reaction. The electrochemical and spectroscopic properties were understood in light of the properties of the isolated building blocks and references compounds, Pt and Fu. In particular, in Pt-Fu, the electrochemical studies revealed that the first reduction process is fullerene-based and that the lowest-energy Pt(+)-Fu(-) charge-separated (CS) state lies in the range 2.0-2.1 eV. The luminescence properties of the investigated species have been monitored in a CH(2)Cl(2) solvent at room temperature and in a MeOH/EtOH (1:4 v/v) glassy solution at 77 K. Upon excitation at 450 nm at room temperature and in air-free solvent, Pt displays an intense luminescence of (3)MLCT nature, with gimel(max) = 605 nm (523 nm at 77 K, corresponding to 2.37 eV), phi(em) = 0.013, and tau(em) = 920 ns. Under the same conditions, Fu exhibits the typical (1)C(60) fluorescence, with lambda(max) = 708 nm (703 nm at 77 K, corresponding to 1.76 eV), phi(em) = 6.0 x 10(-4), and tau(em) = 1.2 ns. For Pt-Fu, room-temperature excitation at 450 nm yields Pt*- and Fu*-centered excited states in a 1.2:1 proportion. However, no Pt-based emission is observed, and (i) in an air-free solvent, (1)Fu fluorescence is observed, while (ii) in an air-equilibrated solvent, singlet oxygen sensitization by the (3)Fu level takes place. Very close (1)O(2)* fluorescence intensities are observed at 1278 nm for isoabsorbing solutions at 450 nm of Fu and Pt-Fu, consistent with complete Pt -> Fu energy transfer in the dyad. The room-temperature nanosecond transient absorption spectra for Pt-Fu and Fu exhibit peaks at 680 and 690 nm with tau(TA) = 14.3 and 24.8 mu s, respectively; in both cases, these are attributed to absorption by the fullerene triplet. By contrast, no CS species, Pt(+)-Fu(-) are detected. The Pt -> Fu energy transfer is discussed, and the rate constant for the (3)Pt-Fu -> Pt(-1) step is evaluated, k(en) > 10(7) s(-1). (literal)
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