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Before each experiment, the [1,3-(pr)2im]Br was dried at 75 C under reduced pressure.
The PAs were prepared by the following general procedure: as an example for the preparation of PA10aI, 0.10 g (1.70 9 10-4 mol) of diacid 8, 0.0338 g (1.70 9 10-4 mol) of diamine 9a and 0.25 g of [1,3-(pr)2im]Br were placed in a porcelain dish and the mixture was ground completely for 5 min, then 0.11 mL (4.26 9 10-4 mol) of TPP was added, and the mixture was ground for 3 min. The reaction mixture was irradiated in the microwave oven for a period of 40 ? 40 ? 20 s at 70% of power level. The resulting viscous solution was poured into 30 mL of methanol, filtered, and dried under vacuum to give 0.118 g (88%) of PA10aI.
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