HL·(PF6)(L= 2, 4-dimethyl-8-phenyl [1, 2, 4] triazolo [4, 3-a][1, 8] naphthyridin-9-ylidene) was synthesized from the nucleophilic reaction of 7-chloro-2, 4-dimethyl-1, 8-naphthyridine with phenylhydrazine and subsequent acidification, anion exchange, and condensation with