New oxamide-based bimetallic ferrimagnets have been synthesized and studied. Reaction of oxamide with copper nitrate and Bu4OH in DMSO solution yields the soluble complex (Bu4N)2 [Cu(C2H2N2O2)2]. Subsequent addition of nickel(II), or cobalt(II), perchlorate results in precipitation of the bimetallic materials. Magnetic susceptibility studies of both compounds show minima in the chi T products, characteristic of ferrimagnetism. The minimum occurs at 45 K for the nickel-copper complex. The minimum for the cobalt-copper complex is too broad to locate accurately. The moments for both complexes reach constant values below 5 K. The cobalt-copper complex shows hysteresis at 4.2 K with a coercive field of 400 G, and exhibits long relaxation times at low temperatures.