A dendritic fullerene-porphyrin dyad.
We describe the synthesis, characterization and photophysical properties of a fullerene derivative whose structure includes a Zn-porphyrin and a second generation liquid-crystalline (LC) dendrimer. The size of the fullerene and porphyrin units with respect to the size of the LC dendrimer prevents the formation of liquid-crystalline phases. However, this system gives interesting photoinduced electron transfer phenomena. Compound has been investigated by steady state and time resolved fluorescence as well as transient absorption spectroscopy in polar and apolar solvents. We demonstrate that the fluorescence of the porphyrin unit in is quenched compared to the Zn-tetraphenylporphyrin used as reference. Femto- and picosecond transient absorption permit to identify the formation of a radical ion pair while nanosecond experiments allowed the determination of the charge recombination lifetimes.
Campidelli
Stéphane
S
Dipartimento di Scienze Farmaceutiche, Università degli Studi di Trieste, Piazzale Europa 1, 34127 Trieste, Italy. scampidelli@units.it
Deschenaux
Robert
R
Swartz
Angela
A
Rahman
G M Aminur
GM
Guldi
Dirk M
DM
Milic
Dragana
D
Vázquez
Ester
E
Prato
Maurizio
M
D050091:Dendrimers / Q000737:chemistry*; D037741:Fullerenes / Q000737:chemistry*; D008665:Metalloporphyrins / Q000737:chemistry*; D015394:Molecular Structure
D050091:Dendrimers; D037741:Fullerenes; D008665:Metalloporphyrins; C017802:zinc hematoporphyrin