http://www.cnr.it/ontology/cnr/individuo/prodotto/ID182140
Absorption Spectra, Photophysical Properties, and Redox Behavior of Ruthenium(II) Polypyridine Complexes Containing Accessory Dipyrromethene-BF2 Chromophores (Articolo in rivista)
- Type
- Label
- Absorption Spectra, Photophysical Properties, and Redox Behavior of Ruthenium(II) Polypyridine Complexes Containing Accessory Dipyrromethene-BF2 Chromophores (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/jp057094p (literal)
- Alternative label
Maurilio Galletta; Fausto Puntoriero; Sebastiano Campagna; Claudio Chiorboli;
Manuel Quesada; Sebastien Goeb; Raymond Ziessel (2006)
Absorption Spectra, Photophysical Properties, and Redox Behavior of Ruthenium(II) Polypyridine Complexes Containing Accessory Dipyrromethene-BF2 Chromophores
in The journal of physical chemistry. A
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Maurilio Galletta; Fausto Puntoriero; Sebastiano Campagna; Claudio Chiorboli;
Manuel Quesada; Sebastien Goeb; Raymond Ziessel (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, UniVersita` di Messina, Via Sperone
31, 98166 Messina, Italy,
ISOF-CNR, Sezione di Ferrara, and Dipartimento di Chimica, UniVersita` di Ferrara,
Via Borsari 46, 44100 Ferrara, Italy,
Laboratoire de Chimie Moleculaire, Ecole de Chimie, Polymeres,
Materiaux (ECPM), UniVersite´ Louis Pasteur (ULP), 25 rue Becquerel, 67087 Strasbourg Cedex 02, France (literal)
- Titolo
- Absorption Spectra, Photophysical Properties, and Redox Behavior of Ruthenium(II) Polypyridine Complexes Containing Accessory Dipyrromethene-BF2 Chromophores (literal)
- Abstract
- The six multichromophoric species 1-6, containing the potentially luminescent Ru(II) polypyridine subunits
and 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene fluorophores (dipyrromethene-BF2 dyes, herein after called
bodipy), have been prepared and their absorption spectra, luminescence properties (both at room temperature
in fluid solution and at 77 K in rigid matrix), and redox properties have been investigated (for the structural
formulas of all the compounds, see Figure 1). For comparison purposes, also the same properties of the
bodipy-based free ligands have been examined. Three of the multichromophoric species (1-3) are based on
the Ru(bpy)3-type metal subunit, whereas 4-6 are based on the Ru(terpy)2-type metal subunit. Transient
absorption spectroscopy at room temperature of all the compounds has also been performed. The absorption
spectra of all the metal complexes show features that can be assigned to the Ru(II) polypyridine subunits and
to the bodipy centers. In particular, the lowest energy spin-allowed ð-ð* transition of the bodipy groups
dominates the visible region, peaking at about 530 nm. All the new complexes exhibit a rich redox behavior,
with reversible processes attributed to specific sites, indicating a small perturbation of each redox center and
therefore highlighting the supramolecular nature of the multichromophoric assemblies. Despite the good
luminescence properties of the separated components, 1-6 do not exhibit any luminescence at room
temperature; however, transient absorption spectroscopy evidences that for all of them a long-lived (microsecond
time scale) excited state is formed, which is identified as the bodipy-based triplet state. Pump-probe transient
absorption spectroscopy suggests that such a triplet state is formed from the promptly prepared bodipy-based
1ð-ð* state in most cases by the intervention of a charge-separated level. At 77 K, all the complexes except
complex 1 exhibit the bodipy-based fluorescence, although with a slightly shortened lifetime compared to the
corresponding free ligand(s), and 4-6 also exhibit a phosphorescence assigned to the bodipy subunits.
Phosphorescence of bodipy species had never been reported in the literature to the best of our knowledge:
in the present cases we propose that it is an effective decay process thanks to the presence of the ruthenium
heavy atom and of the closely lying 3MLCT state of the Ru(terpy)2-type subunits. (literal)
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