The crystal structure of hetero-metal binuclear complex, CuCo(fsaen)·3H2O, with N,N′-bis(3-carboxysalicylidene)ethylenediamine (H4fsaen) was determined by the single-crystal X-ray diffraction method. The crystals are trigonal, space group P3221, a=b=12.845(2), c=9.962(1) Å, V=1423.5(4) Å3, and Z=3. The structure was solved by the heavy atom method and refined by the block-diagonal least-squares method to an R factor of 0.028. The copper atom is coordinated by two nitrogen atoms and two phenolic oxygen atoms in a square-planar manner. The cobalt atom is coordinated by two equatorial carboxyl oxygen atoms, two equatorial phenolic oxygen atoms and two axial water oxygen atoms in a distorted octahedral geometry. The detailed structure determined is in conformity with the magnetic and spectral properties previously reported.
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Mikuriya et al. (1978) studied this question.