Photoinduced electron transfer between fullerenes (C60
and C70) and phthalocyanines such as
tetra-tert-butylphthalocyanine (H2TBPc) and its zinc derivative
(ZnTBPc) in solution has been investigated with
nanosecond laser photolysis method by observing the transient
absorption bands in the visible/near-IR regions.
By the predominant excitation of fullerenes with 532 nm laser
light, slow rises of the transient absorption
bands of phthalocyanine cation radicals and fullerene anion radicals
were observed instead of the decays of
the excited triplet states of fullerenes (TC60*
and TC70*) in polar solvents.
Electron-transfer from the
phthalocyanines to TC60* or
TC70* was confirmed. The quantum yield of
the electron transfer via TC70* is
higher than that via TC60*; ZnTBPc acts as
stronger electron donor than H2TBPc. In nonpolar
solvent, energy
transfer from TC60* (and
TC70*) to the phthalocyanines occurs
predominantly as confirmed by the consecutive
appearance of the triplet states of the phthalocyanines.
Photoinduced electron transfer between
C60/C70 and zinc tetraphenylporphyrin (ZnTPP)
in a polar solvent
has been investigated with a nanosecond laser photolysis method by
observing the transient absorption bands
in the near-IR region. The transient absorption bands of the
C60/C70 radical anion
(C60
•-/C70
•-)
in the near-IR
region gave evidence of electron transfer for the system ZnTPP and
C60/C70. In ZnTPP solution where
C60
and C70 were photoexcited predominantly, electron transfer
takes place from the ground state of ZnTPP to
the triplet states of C60/C70
(3C60*/3C70*). In
the concentrated ZnTPP solution where ZnTPP was
predominantly
photoexcited, the triplet state of ZnTPP donates the electron to the
ground state of C60/C70, producing
C60
•-/C70
•-. The efficiency of
electron transfer via the
3C60*/3C70* route is
higher than that via 3ZnTPP*.
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