A compound which is non-ionic compound, the compound has a group represented by formula (Ia):
wherein R
2
represents a group having a C
3
to C
18
alicyclic hydrocarbon group where a methylene group may be replaced by an oxygen atom or a carbonyl group, Rf
1
and Rf
2
each independently represent a C
1
to C
4
perfluoroalkyl group, and * represents a binding site.
一种非离子化合物,该化合物具有由式(Ia)表示的基团:其中R2代表具有C3到C18脂
环烃基团的基团,其中亚甲基基团可以被氧原子或羰基取代,Rf1和Rf2分别独立地代表C1到C4
全氟烷基基团,*代表一个结合位点。