J.-I. KADOKAWA ET AL.
160
lar oxygen in alkaline aqueous solution was conducted
according to the literature procedure [26].
As a typical procedure for redox reactions of MB in
BMIMCl, a solution of MB in BMIMCl (0.125 μmol/g)
was placed in a quartz cuvette (thickness 1 cm). After
photo irradiation at 280 - 370 nm wavelengths (USHIO
SX-UI 250HQ with 250W Hg lamp and UG11 filter) to
the cuvette was performed at room temperature for 12 h
for progress of the reduction, it was subjected to the UV-
Vis measurement. Then, oxidation of MB was carried
out by standing the solution under the conditions of light
shielding at 50˚C for 6 h with stirring, which was ana-
lyzed by the UV-Vis measurement. The UV-Vis and
fluorescence spectra were recorded on Jasco V-650 spec-
trometer and FP-6300 fluorometer, respectively.
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