A salt represented by formula (I):
wherein R1 and R2 independently each represent a C6-C18 unsubstituted or substituted aromatic hydrocarbon group,
X1 represents a C1-C12 divalent aliphatic saturated hydrocarbon group in which a methylene group can be replaced by an oxygen atom or a carbonyl group, and
A− represents an organic anion.
式 (I) 所代表的盐:
其中 R1 和 R2 各自独立地代表 C6-C18 未取代或取代的
芳香烃基团、
X1 代表 C1-C12 二价脂肪族饱和烃基,其中亚甲基可被氧原子或羰基取代,以及
A- 代表有机阴离子。