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[0367] In general formula (bl), Q 1 represents a divalent linking group containing an oxygen atom. 1 

[0368] Q may contain an atom other than oxygen. Examples of atoms other than oxygen include a carbon atom, a hydrogen atom, a sulfur atom and a nitrogen atom. 

[0369] Examples of divalent linking groups containing an oxygen atom include non-hydrocarbon, oxygen atom-con› taining linking groups such as an oxygen atom ( an ether bond; -0-), an ester bond (-C(=O)-O-), an amido bond (----C(=O)-NH-), a carbonyl group (----C(=O)-) and a carbonate bond (---0-C(=O)-O-); and combinations of the aforementioned non-hydrocarbon, hetero atom-contain› ing linking groups with an alkylene group. 

[0370] Specific examples of the combinations of the afore› mentioned non-hydrocarbon, hetero atom-containing linking groups and an alkylene group include -R$^{91}$---0-, -R 92 - O-C(=O)-, ----C(=O)-O-R$^{93}$-O----C(=O)- (in the formulas, each of R 91 to R 93 independently represents an alkylene group). 

[0371] The alkylene group for R$^{91 }$to R$^{93 }$is preferably a linear or branched alkylene group, and preferably has 1 to 12 carbon atoms, more preferably 1 to 5, and most preferably 1 to 3. 

[0372] Specific examples of alkylene groups include a methylene group [-CH$_{2}$ -]; alkylmethylene groups such as -CH(CH$_{3}$)-, -CH(CH$_{2}$CH$_{3}$)-, ----C(CH$_{3}$ ) 2 -, -C(CH$_{3}$)(CH$_{2}$CH$_{3}$)-, ----C(CH$_{3}$)(CH$_{2}$CH$_{2}$CH$_{3}$)- and -C(CH$_{2}$CH$_{3}$ ) 2 -; an ethylene group [----CH $_{2}$CH$_{2}$ -]; alky- lethylene groups such as ----CH(CH$_{3}$)CH$_{2}$ -, -CH(CH$_{3}$)CH (CH$_{3}$ )-, -C(CH 3 ) $_{2}$CH$_{2}$ - and ----CH(CH$_{2}$CH$_{3}$)CH$_{2}$-; a trimethylene group (n-propylene group) [----CH$_{2}$CH$_{2}$CH$_{2}$-]; alkyltrimethylene groups such as -CH (CH$_{3}$)CH$_{2}$CH$_{2}$ - and -CH$_{2}$CH(CH$_{3}$)CH$_{2}$-; a tetrameth› ylene group [----CH$_{2}$CH$_{2}$CH$_{2}$CH$_{2}$ -]; alkyltetramethylene groups such as ----CH(CH$_{3}$)CH$_{2}$CH$_{2}$CH$_{2}$- and -CH$_{2}$CH (CH$_{3}$)CH$_{2}$CH$_{2}$-; and a pentamethylene group [----CH$_{2}$CH$_{2}$CH$_{2}$CH$_{2}$CH$_{2}$-]. 

[0373] Q$^{1 }$is preferably an ester bond or a divalent linking group containing an ester linkage or ether linkage, and more preferably an ester group or a group of -R$^{91}$-O-, -R 92 - O-C(=O)- or -C(=O)---0-R$^{93}$---0-C(=O)-. 

[0374] In general formula (bl), Y$^{1 }$represents an alkylene group of 1 to 4 carbon atoms which may have a substituent or a fluorinated alkylene group of 1 to 4 carbon atoms which may have a substituent. 1 

[0375] As the alkylene group for Y , the same alkylene groups as those described above for Q 1 which have 1 to 4 carbon atoms can be mentioned. 1 

[0376] As the fluorinated alkylene group for Y , the afore› mentioned alkylene group in which part or all of the hydrogen atoms has been substituted with fluorine atoms can be used. 1 

[0377] Specific examples of Y include ----CF$_{2}$-, -CF$_{2}$CF$_{2}$-, ----CF$_{2}$CF$_{2}$CF$_{2}$-, -CF(CF$_{3}$)CF$_{2}$-, -CF (CF$_{2}$CF$_{3}$)-, ----C(CF 3 ) 2 -, -CF $_{2}$CF$_{2}$CF$_{2}$CF$_{2}$ -, -CF (CF$_{3}$)CF$_{2}$CF$_{2}$-, -CF $_{2}$CF(CF$_{3}$)CF$_{2}$ -, ----CF(CF $_{3}$)CF (CF$_{3}$ )-, ----C(CF 3 ) $_{2}$CF$_{2}$ -, -CF(CF $_{2}$CF$_{3}$)CF$_{2}$ -, -CF (CF$_{2}$CF$_{2}$CF$_{3}$)-, ----C(CF$_{3}$)(CF$_{2}$CF$_{3}$)-; -CHF-, -CH$_{2}$CF$_{2}$-, -CH$_{2}$CH$_{2}$CF$_{2}$-, -CH$_{2}$CF$_{2}$CF$_{2}$-, -CH (CF$_{3}$)CH$_{2}$-, ----CH(CF$_{2}$CF$_{3}$)-, -C(CH$_{3}$)(CF$_{3}$)-, -CH$_{2}$CH$_{2}$CH$_{2}$CF$_{2}$-, ----CH$_{2}$CH$_{2}$CF$_{2}$CF$_{2}$-, ----CH(CF 3 ) CH$_{2}$CH$_{2}$-, ----CH$_{2}$CH(CF $_{3}$)CH$_{2}$-, ----CH(CF $_{3}$)CH (CF$_{3}$)-, ----C(CF 3 ) $_{2}$CH$_{2}$ -; ----CH 2 -, ----CH $_{2}$CH$_{2}$ -, -CH$_{2}$CH$_{2}$CH$_{2}$-, ----CH(CH$_{3}$)CH$_{2}$-, ----CH(CH$_{2}$CH$_{3}$)-, -C(CH$_{3}$ ) 2 -, -CH$_{2}$CH$_{2}$CH$_{2}$CH$_{2}$-, -CH(CH$_{3}$ ) 

CH$_{2}$CH$_{2}$-, -CH$_{2}$CH(CH$_{3}$)CH$_{2}$-, -CH(CH$_{3}$)CH (CH$_{3}$ )-, ----C(CH 3 ) $_{2}$CH$_{2}$ -, ----CH(CH $_{2}$CH$_{3}$)CH$_{2}$ -, -CH (CH$_{2}$CH$_{2}$CH$_{3}$)-, and ----C(CH$_{3}$)(CH$_{2}$CH$_{3}$)-. 

[0378] Y 1 is preferably a fluorinated alkylene group, and particularly preferably a fluorinated alkylene group in which the carbon atom bonded to the adjacent sulfur atom is fluori› nated. Examples of such fluorinated alkylene groups include ----CF$_{2}$-, ----CF$_{2}$CF$_{2}$-, ----CF$_{2}$CF$_{2}$CF$_{2}$-, ----CF(CF 3 ) CF$_{2}$-, ----CF$_{2}$CF$_{2}$CF$_{2}$CF$_{2}$-, -CF(CF$_{3}$)CF$_{2}$CF$_{2}$-, ----CF$_{2}$CF(CF$_{3}$)CF$_{2}$-, ----CF(CF$_{3}$)CF(CF$_{3}$)-, -C(CF 3 ) $_{2}$CF$_{2}$ -, ----CF(CF$_{2}$CF$_{3}$)CF$_{2}$-; ----CH$_{2}$CF$_{2}$-, ----CH$_{2}$CH$_{2}$CF$_{2}$-, ----CH$_{2}$CF$_{2}$CF$_{2}$-; ----CH$_{2}$CH$_{2}$CH$_{2}$CF $_{2}$-, ----CH$_{2}$CH$_{2}$CF $_{2}$CF $_{2}$-, and ----CH$_{2}$CF $_{2}$CF $_{2}$CF $_{2}$-. 

[0379] Of these, ----CF$_{2}$-, ----CF$_{2}$CF$_{2}$-, -CF$_{2}$CF$_{2}$CF$_{2}$ - or CH$_{2}$CF$_{2}$CF$_{2}$ - is preferable, ----CF$_{2}$-, -CF$_{2}$CF$_{2}$ - or -CF $_{2}$CF$_{2}$CF $_{2}$ - is more preferable, and-CF 2 - is particu› larly desirable. 

[0380] The alkylene group or fluorinated alkylene group may have a substituent. The alkylene group or fluorinated alkylene group "has a substituent" means that part or all of the hydrogen atoms or fluorine atoms in the alkylene group or fluorinated alkylene group has been substituted with groups other than hydrogen atoms and fluorine atoms. 

[0381] Examples of substituents which the alkylene group or fluorinated alkylene group may have include an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, and a hydroxyl group. 

[0382] In the present invention, as the anion moiety for the component (Bl), an anion represented by general formula (bl-1) or (bl-2) shown below is preferable. 

[Chemical Formula 46] 

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In formula (bl-1), X andY$^{1 }$are the same as defined above; Q 2 represents a single bond or an alkylene group; and m0 repre› sents 0 or 1. 

[0383] In general formula (bl-1) above, as X, an aliphatic cyclic group which may have a substituent or an aromatic hydrocarbon group which may have a substituent is prefer› able. Of these, an aliphatic cyclic group which contains a hetero atom-containing substituent in the ring structure thereof is more preferable 

[0384] As the alkylene group for Q 2 , the same alkylene groups as those described above for Q$^{1 }$can be mentioned. 

[0385] As Q 2 , a single bond or a methylene group is par› ticularly desirable. Especially, when X is an aliphatic cyclic group which may have a substituent, Q $^{2 }$is preferably a single bond. On the other hand, when Xis an aromatic hydrocarbon group, Q $^{2 }$is preferably a methylene group. 

[0386] m0 may be either 0 or 1. When X is an aliphatic cyclic group which may have a substituent, m0 is preferably 1. On the other hand, when X is an aromatic hydrocarbon group, m0 is preferably 0. 

(bl-1) 

