The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《A volumetric microdetermination of organically bound sulfur and organic and inorganic sulfates》. Authors are Boos, R. N..The article about the compound:8-Hydroxyquinoline 1-oxidecas:1127-45-3,SMILESS:OC1=CC=CC2=CC=C[N+]([O-])=C12).Synthetic Route of C9H7NO2. Through the article, more information about this compound (cas:1127-45-3) is conveyed.
Following combustion of the sample in Schoniger’s apparatus (CA 50, 9225f), organically bound S and organic and inorganic sulfates are determined by precipitation with excess BaCl2 and potentiometric titration of the excess Ba with a solution of Na2EDTA, using a Hg reference electrode. For inorganic sulfates, any metal ions which form chelates with EDTA must first be removed by passing the solution through an ion-exchange resin prior to precipitation with BaCl2.
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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider