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Because neither 4,7-DMP nor Zn(4.7-DMP)3+2 • -2C104~absorbs above 360 µ, the appearance of an absorption band maximum at 400 µ was attributed to the effect of the 4,7-DMP ligand on the electron density in the coordinated 8-quinolinol ligand. The observed bathochromic shift of 20-30 µ from the maximum for the simple chelate, ZnOx2, is similar to that observed when other nitrogen adducts are formed (75).Some preliminary work has also been performed on the extraction of zinc with 2,9-dimethyl-l,10-phenanthroline alone. This has been sufficient to show that the behavior of this re-
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