[0074]  Among the moieties of the above-mentioned aro› matic ring structures (i) to (iii), preferred are the aromatic  ring structures (ii) in which the atom forming the functional  group Y ( cation portion) constitutes the aromatic ring at the  same time and the aromatic ring structures (iii) subjected to  replacement by the functional group because an amount  ( concentration) of functional groups can be increased, and  also because it is possible to enhance functions as an ionic  liquid type functional material, a dissolving power of a  solute and ability of acid trap in the case of a reaction  medium and extraction medium, and moving performance in  the case of an actuator.  [0075]  Also those moieties (ii) and (iii) are preferred from  the viewpoint of oxidation resistance.  [0076]  Further among the ring structures of the moiety Ry  of the aromatic ring structures of the present invention,  monocyclic structures are particularly preferred and can  decrease a viscosity and undergo liquefaction effectively.  [0077]  In the compound of the formula (1) to be used for  the ionic liquid type functional material of the present  invention, the first bonding of the organic group Ry con› taining the aromatic ring structure and having the functional  group Y to the moiety -D- of the fluorine-containing ether  structure is the direct bonding of Ry exemplified in (i), (ii)  and (iii) above to -D-, and the second one is the bonding via  a bond (spacer) being provided between Ry and -D-. When  Ry and -D- are bonded via the bond, it is assumed that the  bond (-A-) is included in Ry (when Ry has the bond -A-, Ry  is represented by -A-Ry").  [0078]  The direct bonding of Ry to -D- is preferred  particularly from the viewpoint of heat resistance and oxi› dation resistance.  [0079]  When bonding via the bond, the bond (-A-) is not  limited particularly as far as it is a divalent bond with  covalent bonding. The bond (-A-) is selected from divalent  hetero atoms and divalent organic groups.  [0080]  More preferred are ether bond (---0-), thioether  bond (-S-), divalent alkylene group, divalent fluorine› containing alkylene group, ester bond, sulfonic ester bond,  phosphoric ester bond, acid amide bond, amidine bond and  the like from the point of not lowering oxidation resistance.  (a) In the Case of the Bond-A- Being a DivalentAlkylene  Group or Divalent Fluorine-containing Alkylene Group  [0081]  The divalent alkylene group is preferably selected  from divalent alkylene groups having 1 to 10 carbon atoms,  and is more preferably a divalent alkylene group having 1 to  5 carbon atoms, particularly preferably methylene group or  ethylene group. Hydrocarbon groups having a too long chain  is not preferred because oxidation resistance is lowered.  [0082]  The divalent fluorine-containing alkylene group is  the above-mentioned alkylene group in which a part or the  whole of hydrogen atoms are replaced by fluorine atoms.  From the viewpoint of oxidation resistance, replacement by  more fluorine atoms is preferred, and particularly preferred  are perfluoro alkylene groups.  [0083]  Preferred examples thereof are:  -D-CH2-Ry", -D-CH2CH2-Ry",  -D-CF2CF2-Ry", -D-CF2CF2CF2CF2-Ry",  [0084]  Those bonds are preferred from the viewpoint of  oxidation resistance.  (b) In the Case of the Bond -A- Being an Ether Bond  (-0-) or Thioether Bond (-S-)  [0085]  Concretely there are -D-O-Ry", -D-S-Ry" and the  like.  [0086]  Particularly preferred is an ether bond from the  viewpoint of oxidation resistance, heat resistance and  chemical resistance.  (c) In the Case of the Bond -A- Being an Ester Bond,  Sulfonic Ester Bond or Phosphoric Ester Bond  US 2007/0179263 A  1  and the like.  [0087]  Examples thereof are:  8  Aug. 2, 2007  and the like.  -continued  N--,CH2Y,  II  N  -YH CA-_ N_,,  2  H  -D-CO-Ry",  II  -D-OC-Ry",  II  0  0  0  0  II  II  -D-0S-Ry",  II  -D-S0-Ry",  II  0  0  0  0  II  II  -D-OP-Ry",  II  -D-PO-Ry"  II  0  0  and the like. 