10.1002/ejoc.201601494
European Journal of Organic Chemistry
FULL PAPER
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standard to every aliquot (5 L) before injection. The chromatograms were
analyzed at 250 or 275 nm. Starting materials and final compounds were
identified by comparison to commercial standards.
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Photophysical instrumentation
A Shimadzu UV-2101PC spectrophotometer was employed to perform the
UV/Vis absorption spectra. Steady-state and time-resolved fluorescence
experiments were carried out on a Photon Technology International (PTI)
LPS-220B spectrofluorometer and on a EasyLife V spectrofluorometer
from OBB, respectively. In the case of time-resolved fluorescence, the
apparatus was equipped with a diode LED (exc = 460 nm) excitation
source; residual excitation signal was filtered in emission by using a cut-
off filter (50% transmission at 475 nm). A pulsed Nd: YAG SL404G-10
Spectron Laser Systems at the excitation wavelength of 355 nm was
employed to carry out the laser flash photolysis (LFP) experiments. The
energy of the single pulses (~10 ns duration) was lower than 30 mJ pulse-
1. The laser flash photolysis system is formed by the pulsed laser, a pulsed
Lo255 Oriel Xenon lamp, a 77200 Oriel monochromator, an Oriel
photomultiplier tube (PMT) housing, a 70705 PMT power supply and a
TDS-640A Tektronix oscilloscope. Photophysical measurements were run
at room temperature under nitrogen using quartz cells of 1 cm optical path
length.
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For the steady-state and time-resolved fluorescence experiments, aerated
DMF solutions of RF (absorbance lower than 0.15 at exc = 446 or 460 nm,
respectively) were treated with increasing concentrations of amine or
bromoderivative (up to 5 x 10-2 M). Transient absorption experiments were
performed on deaerated solutions of RF in DMF (4 x 10-5 M).
Acknowledgements
R. Martinez-Haya acknowledges generous support from Spanish
Government (Grant SEV-2012-0267). We also thank support from
Generalitat Valenciana (Prometeo Program) and VLC/Campus.
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Keywords: electron transfer • photophysics • reactive
intermediates • redox chemistry • time-resolved spectroscopy
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