title: Utility of chloranil in assay of naphazoline, clemizole, penicillin G sodium, and piperazine.
abstract: A simple and sensitive spectrophotometric method is described for the assay of naphazoline, clemizole, penicillin G sodium, and piperazine. The method was based on the formation of a charge transfer complex between these drugs as n-donors and chloranil, the pi-acceptor. Conformity to Beer's law enabled the assay of dosage forms of these drugs. Compared with official methods, the results obtained were of equal accuracy. A more detailed investigation of th naphazoline-chloranil complex was made with respect to its composition, association constant, and free energy change.
mesh_terms: D001562:Benzimidazoles / Q000032:analysis; D055598:Chemical Phenomena; D002621:Chemistry; D002703:Chloranil; D009278:Naphazoline / Q000032:analysis; D010400:Penicillin G / Q000032:analysis; D010879:Piperazines / Q000032:analysis; D011809:Quinones
chemical_list: D001562:Benzimidazoles; D010879:Piperazines; D011809:Quinones; D002703:Chloranil; D009278:Naphazoline; D010400:Penicillin G