Karaman, Yeliz published the artcileInvestigation of electrochemical behavior of Calmagite at a glassy carbon electrode, Application of 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, the publication is Dyes and Pigments (2014), 39-44, database is CAplus.
The voltammetric behavior of 1-(1-hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic acid (Calmagite) was studied by square-wave voltammetry (SWV), differential pulse voltammetry (DPV), cyclic voltammetry (CV) and d.c. voltammetry (DCV) in different electrolyte media. The voltammograms recorded at a glassy C electrode (GCE) exhibit one cathodic peak, corresponding to the two-step four-electron reduction process of azo compound The observed shift of the compound reduction peaks to more neg. potentials with increasing pH indicates that H ions are involved in the electrode reaction. The effect of scan rate and pH on the reduction peaks was studied. From the voltammetric data, the electrochem. reaction mechanism of the azo compound was suggested.
Dyes and Pigments published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C10H9NO4S, Application of 4-Amino-3-hydroxynaphthalene-1-sulfonic acid.
Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem