r I ''he new complexing reagent specific for copper is 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline.The well-known complexing reagent, 1,10-phenanthroline, and many of its 2 to 9 hydrogen substitution derivatives serve to form highly colored complex cations with iron(II) and copper(I) ions (4, 5). The substitution of methyl groups for its 2,9 hydrogens prevents chelation with iron(II) but not with copper(I). The determination of copper in steel employing 2,9-dimethyl-l, 10phenanthroline has been described by Smith and McCurdy (6). This copper specific was given the trivial name of neo-cuproine out of deference to Hoste, who described (S) the use of 2,2'diquinoline for the same determination. Hoste suggested the name "cuproine" for the latter reagent, because it gives with copper(I) a reaction analogous to the chelation of iron(II) with 1,10-phenanthroline in the well-known "ferroin reaction." Cuproine had originally been studied as a copper specific by Breckenridge, Lewis, and Quick (f).

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