content_image/929341.jpg content_image/929338.jpg content_image/929339.jpg content_image/929340.jpg
hetero atom forming the functional group Y ( cation portion) may constitute the aromatic ring at the same time. 

[0069] Also as mentioned above, the functional group Y may be one or more and is present as a substituent of the aromatic ring structure or is present in the ring structure. 

[0070] Concretely there are following aromatic ring struc› tures. 

(i) Aromatic Ring Structures in Which the Funct)ona) Group Y is Bonded to the Carbon Atom of the Aromatic Rmg as a Substituent 

[0071] Examples thereof are: 

<img src='content_image/929341.jpg'>

<img src='content_image/929338.jpg'>

and the like. 

(ii) Aromatic Ring Structures in Which the Atom Forming the Functional Group Y (Cation Portion in the Case of the Salt Y 2 ) Constitutes the Aromatic Ring at the Same Time 

[0072] Examples thereof when the functional group Y is amine are: 

<img src='content_image/929339.jpg'>

and the like. 

(iii) Aromatic Ring Structures in Which the Functional Group Y is Further Bonded as a Substituent to the Carbon Atom of the Aromatic Ring Structure (ii) 

[0073] Preferred examples thereof are: 

<img src='content_image/929340.jpg'>

