Aug.  27,  2020  69  US 2020/0272048 Al  [0061]  Examples of the cation having formula (A-2) are  shown below, but not limited thereto.  [0062]  The anion of the cyclic ammonium salt is a car› boxylate, sulfonamide, halogenated phenoxide or halide  amon.  [0063]  Preferably, the carboxylate anion has the formula  (B-1) or (B-2), the sulfonamide anion has the formula (B-3),  and the halogenated phenoxide anion has the formula (B-4),  all shown below.  (B-1)  (B-2)  0  0  II  II  -o-c-R 8 -c-o- -continued 