METHOD FOR PRODUCING POLYPYRIDINIUM
[PROBLEMS] To provide a process for producing polypyridinium having a narrow molecular weight distribution and a desired molecular weight. [MEANS FOR SOLVING PROBLEMS] A pyridine derivative monomer (2) is polymerized with a polymerization initiator (1) specially designed, such as a 4-halopyridinium, in the presence of a dissolution accelerator (e.g., tetrabutylammonium tetrafluoroborate) for dissolving the polymer to be yielded in a solvent to thereby synthesize a polypyridinium (3) having a narrow molecular weight distribution and a desired molecular weight, as shown in the following scheme (Chemical formula 4). [Chemical formula 4] (1) + (2) -> (3) (In the scheme, Y is an anion dissolving in the organic solvent
X and Z each is halogeno
R is a hydrocarbon group, etc.
and o is 1 to about 300.)