A donor-acceptor dyad composed by a BF2-chelated dipyrromethene (BODIPY) and a C60 fullerene has been newly synthetized and characterized. The two moieties are linked by direct addition of an azido substituted BODIPY on the C60, producing an immino-fullerene-BODIPY adduct. The photoinduced charge-transfer process in this system was studied by ultrafast transient absorption spectroscopy. Electron transfer towards the fullerene was found to occur both selectively exciting the BODIPY chromophore at 475 nm and the C60 unit at 266 nm on a few picosecond timescale, but the dynamics of charge separation was different in the two cases. Eletrochemical studies provided information on the redox potentials of the involved species and spectroelectrochemical measurements allowed to unambiguously assign the absorption band of the oxidised BODIPY moiety, which helped in the interpretation of the transient absorption spectra. The experimental studies were complemented by a theoretical analysis based on DFT computations of the excited state energies of the two components and their electronic couplings, which allowed to identify the charge transfer mechanism and rationalize the different kinetic behaviour observed by changing the excitation conditions.

Efficient photoinduced charge separation in a BODIPY-C60 dyad / Iagatti, Alessandro; Cupellini, Lorenzo; Biagiotti, Giacomo; Caprasecca, Stefano; Fedeli, Stefano; Lapini, Andrea; Ussano, Eleonora; Cicchi, Stefano; Foggi, Paolo; Marcaccio, Massimo; Mennucci, Benedetta; Di Donato, Mariangela. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - ELETTRONICO. - 120:(2016), pp. 16526-16536. [10.1021/acs.jpcc.6b05738]

Efficient photoinduced charge separation in a BODIPY-C60 dyad

BIAGIOTTI, GIACOMO;FEDELI, STEFANO;LAPINI, ANDREA;CICCHI, STEFANO;DI DONATO, MARIANGELA
2016

Abstract

A donor-acceptor dyad composed by a BF2-chelated dipyrromethene (BODIPY) and a C60 fullerene has been newly synthetized and characterized. The two moieties are linked by direct addition of an azido substituted BODIPY on the C60, producing an immino-fullerene-BODIPY adduct. The photoinduced charge-transfer process in this system was studied by ultrafast transient absorption spectroscopy. Electron transfer towards the fullerene was found to occur both selectively exciting the BODIPY chromophore at 475 nm and the C60 unit at 266 nm on a few picosecond timescale, but the dynamics of charge separation was different in the two cases. Eletrochemical studies provided information on the redox potentials of the involved species and spectroelectrochemical measurements allowed to unambiguously assign the absorption band of the oxidised BODIPY moiety, which helped in the interpretation of the transient absorption spectra. The experimental studies were complemented by a theoretical analysis based on DFT computations of the excited state energies of the two components and their electronic couplings, which allowed to identify the charge transfer mechanism and rationalize the different kinetic behaviour observed by changing the excitation conditions.
120
16526
16536
Goal 7: Affordable and clean energy
Iagatti, Alessandro; Cupellini, Lorenzo; Biagiotti, Giacomo; Caprasecca, Stefano; Fedeli, Stefano; Lapini, Andrea; Ussano, Eleonora; Cicchi, Stefano; Foggi, Paolo; Marcaccio, Massimo; Mennucci, Benedetta; Di Donato, Mariangela
File in questo prodotto:
File Dimensione Formato  
Iagatti_JPCC_2016_120_16526.pdf

Accesso chiuso

Descrizione: Articolo principale
Tipologia: Pdf editoriale (Version of record)
Licenza: DRM non definito
Dimensione 1.78 MB
Formato Adobe PDF
1.78 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2158/1050017
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 21
  • ???jsp.display-item.citation.isi??? 21
social impact