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The iron(II), cobalt(II), nickel(II), and copper(I1) complexes with a series of hydrazones of 2,6-diacetyIpyridine have been prepared. The ligands include: 2,6-diacetylpyridinedihydrazone, H ; 2,6-diacetylpyridinebis(methylhydrazone), MH; 2,6-diacetylpyridinebis(phenylhydrazone), PH; and 2,6-diacetylpyridinebis(dimethylhydrazone), dMH. From the sixcoordinate nickel(I1) complexes, the spectrochemical series is H (Dq = 1258 cm-I) >> d M H (Dq = 1119 emT1) = M H (Dg = 1117 cm-l) > PH (Dq = 1063 cm-I). The variation reveals the intramolecular steric requirements in these complexes.The iron(I1) complexes FeL2+, all of the spin-paired configuration, provide an illustration of the pitfalls associated with ferromagnetic impurities. A series of one-to-one complexes may contain examples of five-coordination.

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