Functional thin organic membrane

Claim 1

A functional thin organic membrane comprising a monomolecular film which contains at least one organic amphoteric host molecule having a reactive functional group capable of chemically binding with a nucleophilic functional group at room temperature, wherein said at least one organic amphoteric host molecule is represented by formula (1) (A) .sub.m --L--(B).sub.n ( 1) wherein A represents a functional group capable of binding with a nucleophilic functional group at room temperature; L represents a single bond or a group having a valence of (m+n); B represents an organic residual group which imparts a monomolecular film forming ability to the compound of formula (1); and m and n are each an integer of from 1 to 3, and wherein said functional group represented by A is represented by one of formulae (2) to (6): ##STR9## wherein X 1 represents ##STR10## or --N--; Y 1 represents a hydrogen atom, --O--R 2 or ##STR11## R 1 represents a hydrogen atom, an alkyl group having from 1 to 10 carbon atoms, an aryl group having from 6 to 10 carbon atoms, or an aralkyl group having from 7 to 10 carbons atoms; R 2 is either the same as R 1 or represents an alkali metal atom or an ammonium atom; R 3 and R 4 , which may be the same or different, each has the same meaning as defined for R 1 , provided that R 3 and R 4 may combine to form a ring: --X.sup.2 --CH═CH.sub.2 ( 3) wherein X 2 represents --CO--, --SO--, or --SO 2 --; --X.sup.3 --CH.sub.2 CH.sub.2 --Y.sup.2 ( 4) wherein X 3 represents --CO--, --SO--, or --SO 2 --; and Y 2 represents a group capable of being released as a result of a β-elimination reaction upon contact with a base; ##STR12## wherein X 4 represents a group capable of being released as a result of a substitution reaction upon reaction with a primary amino group; and ##STR13##