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[0116] In formulae (1-1) and (1-2), x- is an anion selected from the formulae (IA) to (ID). 

[0117] In formula (IA), wa is fluorine or a Cl-C40 mon› ovalent hydrocarbon group which may contain a heteroa› tom. The monovalent hydrocarbon group may be straight, branched or cyclic and examples thereof are as will be exemplified below for R 107 . 

[0118] Of the anions of formula (IA), a structure having formula (IA’) is preferred. 

[0119] In formula (IA’), R$^{106 }$is hydrogen or trifluorom› ethyl, preferably trifluoromethyl. 

[0120] R $^{107 }$is a C$_{1 }$-C$_{38 }$ monovalent hydrocarbon group which may contain a heteroatom. Suitable heteroatoms include oxygen, nitrogen, sulfur and halogen, with oxygen being preferred. Of the monovalent hydrocarbon groups, 

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