Primachek, O. K.; Gibalo, I. M.; Nemodruk, A. A. published the article 《Azo compounds from 8-hydroxyguinoline N-oxide and its analogs as a new class of organic reagents》. Keywords: benzeneazoquinolinol oxide reagent metal determination; azoquinolinol oxide reagent metal determination; quinolinol oxide reagent metal determination; photometry transition metal determination; extraction copper determination; copper determination extraction photometry; palladium determination photometry.They researched the compound: 8-Hydroxyquinoline 1-oxide( cas:1127-45-3 ).Category: quinoxaline. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:1127-45-3) here.
Reagents for photometric and extraction-photometric determination of Co, Cu, Ni, Pd, Ag, and other metals were prepared by coupling benzenediazonium or its derivatives and 8-quinolinol N-oxide (I) and its derivatives Cu2+ was determined by extraction of its complex with the coupling product of diazotized picramic acid and I into CHCl3 from a pH 6-7 solution and measuring the absorbance. The same reagent was used for determining Pd phtometrically at pH 0.5-8. The complexes of metals other than Cu were not extractable.
Although many compounds look similar to this compound(1127-45-3)Category: quinoxaline, numerous studies have shown that this compound(SMILES:OC1=CC=CC2=CC=C[N+]([O-])=C12), has unique advantages. If you want to know more about similar compounds, you can read my other articles.
Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider