title: New chromogens of the ferroin type-IX 2-pyridyl and pyrazinylhydrazones of some pyridyl, pyrazinyl and pyridazinyl ketones and of isatin and phenylglyoxal.
abstract: Chromogenic properties of 22 new hydrazones, all ferroin-type compounds, have been evaluated with respect to iron(II), copper(I), cobalt(II) and nickel(II). Some show promise as sensitive reagents for the determination of trace amounts of these metal ions. Stoichiometric ratios were determined for the iron(II) chelates and interpreted to distinguish between syn- and anti-isomers.
authors.affiliation: Department of Chemistry, Northern Illinois University, DeKalb, Illinois 60115, U.S.A.
authors.forename: A A
authors.initials: AA
authors.lastname: Schilt
authors.forename: P C
authors.initials: PC
authors.lastname: Quinn
authors.forename: C L
authors.initials: CL
authors.lastname: Johnson