Cameron, Alan John published the artcileMetal-pyridine-2-carboxaldehyde 2-pyridylhydrazone complexes as visual acid-base indicators. I. Indicator constants, color changes, and titrations, Formula: C11H10N4, the publication is Analytica Chimica Acta (1970), 51(2), 249-56, database is CAplus.
The pyridine-2-carboxaldehyde 2-pyridylhydrazone complexes of certain metals are suggested as acid-base indicators. The color change intervals of aqueous solutions of the complexes of Cu(II), Fe(II), Ni(II), Zn(II), and Cd(II) have been studied. Apparent indicator constants have been determined The performance of the indicators in titrns of weak and strong acids and bases is excellent.
Analytica Chimica Acta published new progress about 2215-33-0. 2215-33-0 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, and the molecular formula is C11H10N4, Formula: C11H10N4.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem