A molecular triad consisting of a diarylporphyrin (P)
covalently linked to a carotenoid polyene (C) and a
fullerene (C60) has been prepared and studied using
time-resolved spectroscopic methods. In
2-methyltetrahydrofuran
solution, the triad undergoes photoinduced electron transfer to yield
C−P•+−C60
•-, which
evolves into C•+−P−C60
•- with an overall quantum yield of 0.14.
This state decays by charge recombination to yield the
carotenoid
triplet state with a time constant of 170 ns. Even in a glass at
77 K, C•+−P−C60
•- is
formed with a quantum yield
of ∼0.10 and again decays mainly by charge recombination to give
3C−P−C60. The fullerene triplet,
formed through
normal intersystem crossing, is also observed at 77 K. The
generation in the triad of a long-lived charge separated
state by photoinduced electron transfer, the low-temperature electron
transfer behavior, and the formation of a triplet
state by charge recombination are phenomena previously observed mostly
in photosynthetic reaction centers.
BACKGROUND-New regulatory requirements for donor eligibility challenge blood centers to recruit and retain enough donors. This study evaluated correlations between overall satisfaction with the donation process and donor demographics and the effect of both on a donor's intent to return.
et al. Mutations in SETBP1 are recurrent in myelodysplastic syndromes and often coexist with cytogenetic markers associated with disease progression. Br J Haematol. 2013;163:235-9.
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