Patent ID: 8198387

Claim:
A proton-conducting compound composed of a melamine compound salt obtained from a melamine compound represented by the following formula (1) and a Bronsted acid: wherein: R 1 is CH 2 ═CR 6 —CO—O(CH 2 ) n —; R 2 , R 3 , R 4 , and R 5 each is independently an alkyl group, an aryl group, a heterocyclic group, or hydrogen and at least one of them is an alkyl group, an aryl group, or a heterocyclic group; R 2 and R 3 or R 4 and R 5 may join together to form a heterocyclic structure; R 6 is hydrogen or an alkyl group and n is an integer equal to or larger than 1; and the alkyl group, the aryl group, and the heterocyclic group each may have a substituent selected from the group of alkyl groups of 1 to 6 carbon atoms, aryl groups of 6 to 12 carbon atoms, heterocyclic groups, an amino group, alkylamino groups of 1 to 6 carbon atoms, a nitro group, a carboxyl group, acyl groups of 1 to 6 carbon atoms, acyloxy groups of 1 to 6 carbon atoms, a cyano group, alkylsulfonyl groups of 1 to 6 carbon atoms, alkylsulfonyloxy groups of 1 to 6 carbon atoms, a sulfoxide group, a sulfonic acid group, alkoxycarbonyl groups of 1 to 6 carbon atoms, aryloxycarbonyl groups of 6 to 12 carbon atoms, aryloxy groups of 6 to 12 carbon atoms, and alkynyl groups of 2 to 6 carbon atoms; and wherein the Bronsted acid is sulfuric acid, phosphoric acid, boric acid, a heteropolyacid, alkylsulfonic acid, a fluorine-containing alkylsulfonic acid, an alkylcarboxylic acid, or an imide acid, wherein the alkyl moiety contains 1 to 6 carbon atoms.