ChemComm
Communication
This research was supported by the Natural Sciences and
Engineering Research Council (NSERC) of Canada and the Canada
Research Chairs Program. This work made use of 4D LABS shared
facilities supported by the Canada Foundation for Innovation (CFI),
British Columbia Knowledge Development Fund (BCKDF) and
Simon Fraser University. The Authors thank Dr John-Christopher
Boyer for his advice on the decoration of nanoparticles. We also
thank Dr Saeid Kamal, manager of the LASIR facility at 4D LABS for
his help with setting up the laser experiments.
Notes and references
‡ Compounds 1 and 2 are insoluble in polar protic solvents such as
water, MeOH and EtOH. It is freely soluble in common organic solvents
such as CHCl3 and CH2Cl2.
§ These conditions are critical to maintain due to the light and heat-
sensitive nature of the system.
¶ Any small differences in retention time can be attributed to instru-
ment error. Addition of small amount of each of the authentic samples
(DPBF and DPBF-EP) to the solution of 1-NP after irradiation over-
lapped with the two peaks shown in Fig. 2d.
Fig. 2 (a) Changes in the UV-vis absorption spectra of a CHCl3 dispersion of
decorated nanoparticles (1-NP) as it is irradiated with 532 nm pulsed laser light
(10 Hz, 5 mJ per pulse, 10 ns) for a total of 140 s. The spectral data was corrected
for scatter at 800 nm. (b) Changes in the UV-vis absorption spectra of a CHCl3
dispersion of decorated nanoparticles (1-NP) with added diphenylisobenzofuran
(DPBF) as a singlet oxygen trapping agent as it is irradiated with 532 nm pulsed
laser light (10 Hz, 5 mJ per pulse, 10 ns) for a total of 180 s. The spectral data was
corrected for scatter at 800 nm. (c) The changes in absorption intensity at 395 nm
corresponding to the anthracene products (2-NP and 2) as the same dispersions of
decorated nanoparticles (1-NP) (black squares) and endoperoxide ligand 1 (empty
circles) are irradiated with 532 nm pulsed laser light (10 Hz, 5 mJ per pulse, 10 ns).
The empty diamonds show the change in absorption intensity at 410 nm corres-
ponding to the added diphenylisobenzofuran trapping agent as the same disper-
sion is irradiated with 532 nm pulsed laser light (10 Hz, 5 mJ per pulse, 10 ns). The
last set of data was corrected for the absorption at 465 nm. (d) HPLC chromato-
grams (1 mL minÀ1, CHCl3 as a mobile phase, 254 nm detector) of CHCl3 solutions
of the diphenylisobenzofuran (DPBF) singlet oxygen trapping agent, an authentic
sample of the endoperoxide product of the trapping agent and singlet oxygen
(DPBF-EP) and the endoperoxide-coated nanoparticles 1-NP after they were
irradiated with 532 nm pulsed laser light (10 Hz, 5 mJ per pulse, 10 ns) for 180 s.
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c
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