Cameron, Alan John published the artcileMetal-pyridine-2-carboxaldehyde 2-pyridylhydrazone complexes as visual acid-base indicators. II. Extractive end point titrations and pH of extraction, Product Details of C11H10N4, the publication is Analytica Chimica Acta (1970), 51(2), 257-63, database is CAplus.
The pyridine-2-carboxaldehyde 2-pyridylhydrazone complexes of Cu(II), Fe(II), and Ni(II) are very good indicators for extractive end points in acid-base titrations The pH ranges for extraction of the complexes have been established, and their relevance to the extractive end points is discussed.
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, Product Details of C11H10N4.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem