(d) In the Case of the Bond -A- Being an Amide Bond 

[0088] Concretely there are: 

-D-C-N-Ry", -D-N-C-Ry" II I I II 0 R’ R’ 0 

and the like, wherein R’ is hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and from the point of not lowering oxidation resistance and heat resistance, it is pref› erable that R’ is hydrogen atom or an alkyl group having 1 to 5 carbon atoms, particularly preferably hydrogen atom or methyl. 

[0089] Examples thereof are: 

-D-C-N-Ry", -D-N-C-Ry", II I I II 0 H H 0 0 II -D-C-N-Ry", II I -D-N-C-Ry" I 0 CH3 CH3 

and the like. 

[0090] Those bonds are preferred from the point that oxidation resistance and heat resistance are excellent. 

(e) In the Case of the Bond-A- Being a SulfonicAcidAmide Bond or Phosphoric Acid Amide Bond 

[0091] Concretely there are preferably: 

0 0 II II -D-S-N-Ry", -D-N-S-Ry", II I I II 0 R’ R’ 0 0 0 II II -D-P-N-Ry", -D-N-P-Ry" II I I II 0 R’ R’ 0 

and the like, wherein R’ is hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms. 

[0092] From the point of not lowering oxidation resistance and heat resistance, it is preferable that R’ is hydrogen atom or an alkyl group having 1 to 5 carbon atoms, particularly preferably hydrogen atom or methyl. 

[0093] Preferred examples thereof are: 

0 0 II II -D-S-N-Ry", -D-N-S-Ry", II I I II 0 H H 0 

0 0 II II -D-P-N-Ry" -D-N-P-Ry" II I , I II , 0 H H 0 0 0 II II -D-S-N-Ry", -D-N-S-Ry", II I I II 0 CH3 H3C 0 0 0 II II -D-P-N-Ry" -D-N-P-Ry" II I , I II 0 CH3 H3C 0 

and the like. 

(f) in the Case of the Bond -A- Being an Amidine Bond 

[0094] Concretely there are preferably: 

NR’ II -D-C-N-Ry" I R" 

and the like, wherein R’ and R" are the same or different and each is hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms. 

[0095] From the point of not lowering oxidation resistance and heat resistance, it is preferable that R’ and R" are hydrogen atom or an alkyl group having 1 to 5 carbon atoms, particularly preferably hydrogen atom or methyl. 

[0096] Preferred examples thereof are: 

NH N-CH3 II II -D-C-NH-Ry", -D-C-NH-Ry" 

and the like. 

[0097] Among those bonds exemplified in (a) to (f), a divalent alkylene group, divalent fluorine-containing alky› lene group, ether bond, amide bond and amidine bond are preferred particularly from the viewpoint of oxidation resis› tance. 

[0098] Also in Ry exemplified in (a) to (f), examples of Ry exemplified supra in (i), (ii) and (iii) can be preferably used similarly as the examples of the moiety Ry" of the aromatic ring structure having the functional group Y. 

[0099] In the aromatic compound of the formula (1) to be used for the ionic liquid type functional material of the present invention, Ra is a residue bonded to another end of -D- and is not limited particularly as far as it is selected from monovalent organic groups which have 1 to 20 carbon atoms and do not contain the structure -D-. 

[0100] Preferred examples of Ra are (iv) fluorine-contain› ing alkyl groups Rx which have 1 to 20 carbon atoms and may have ether bond. 

-continued 

