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[Chemical Formula 42] 

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In the formulas, R $^{4}$a represents a hydrogen atom or an alkyl group; R$^{41 }$represents an alkyl group, an acetyl group, a car› boxy group or a hydroxyalkyl group; each of R$^{42 }$to R 46 independently represents an alkyl group, an acetyl group, an alkoxy group, a carboxy group, or ahydroxyalkyl group; each of Ila to n$_{5 }$ independently represents an integer of 0 to 3, provided that Ila+ n $_{1 }$is 5 or less; and n$_{6 }$represents an integer of 0 to 2. 

[0340] In general formulas (I-5) and (1-6), with respect to R$^{4}$a to R 46 , the alkyl group is preferably an alkyl group of 1 to 5 carbon atoms, more preferably a linear or branched alkyl group, and most preferably a methyl group, all ethyl group, a propyl group, an isopropyl group, an n-butyl group or a tert butyl group. 

[0341] The alkoxy group is preferably an alkoxy group ofl to 5 carbon atoms, more preferably a linear or branched alkoxy group, and most preferably a methoxy group or ethoxy group. 

[0342] The hydroxyalkyl group is preferably the aforemen› tioned alkyl group in which one or more hydrogen atoms have been substituted with hydroxy groups, and examples thereof include a hydroxymethyl group, a hydroxyethyl group and a hydroxypropyl group. 

[0343] If there axe two or more of the OR $^{4}$a group, as indicated by the value of na, then the two or more of the OR $^{4}$a group may be the same or different from each other. 46 

[0344] If there are two or more of an individual R$^{41 }$to R group, as indicated by the corresponding value of n$_{1 }$ to n$_{6}$ , then the two or more of the individual R$^{41 }$to R$^{46 }$group may be the same or different from each other. 

[0345] Ila is preferably 0 or 1. 

[0346] n$_{1 }$ is preferably Oto 2. 

[0347] It is preferable that n$_{2 }$ and n$_{3 }$ each independently represent 0 or 1, and more preferably 0. 

[0348] n$_{4 }$ is preferably Oto 2, and more preferably 0 or 1. 

[0349] n$_{5 }$ is preferably 0 or 1, and more preferably 0. 

[0350] n$_{6 }$ is preferably 0 or 1. 

(1-5) 

(1-6) 

[0351] Among the aforementioned examples, as the cation moiety for the component (B 1 ), a cation represented by gen› eral formula (I-1) or (I-5) is preferable, and a cation repre› sented by any one of formulas (I-1-1) to (I-1-10) and (I-5-1) to (I-5-4) shown below is particularly desirable. Among these, a cation having a triphenyl skeleton, such as a cation represented by any one of formulas (I-1-1) to (1-1-8) shown below is particularly desirable. 

[0352] In formulas (I-1-9) and (I-1-10), each ofR$^{8 }$and R 9 independently represents a phenyl group or naphthyl group which may have a substituent, an alkyl group of 1 to 5 carbon atoms, an alkoxy group or a hydroxy group. 

[0353] u is an integer of 1 to 3, and most preferably 1 or 2. 

[Chemical Formula 43] 

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(1-1-1) 

(1-1-2) 

(1-1-3) 

(1-1-4) 

