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Photo-irradiation of a thermodynamically unstable two-phase water–DEAS system with a white light (275–750 nm) source located at a distance of 3 cm from the side of the soda glass vial (see Fig. 2). The initial aqueous phase contained K6[P2W18O62] (2.0 mM) and KCl (0.1 M). Irradiation time: (A) none; (B) 5; (C) 10; (D) 20; (E) 60 min.
