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Diaquacobalt(II) n-dodecane-α,ω-dioate (2) has been synthesized by metathesis of the corresponding potassium soap 1 and has been fully characterized by chemical and spectroscopic analysis. The crystal structure of 2 has been established by X-ray powder diffraction techniques combined with electron diffraction experiments. It crystallizes in a monoclinic cell P21/a; a = 9.6558(8), b = 7.4793(6), c = 19.8936(2) Å, β = 95.648(9)°, V = 1429.7(3) Å3; Z = 2 and consists of stacked layers of cobalt(II) ions connected by carboxylato bridges, thus forming chains that extend along the a axis. These layers are separated by alkyl chains arranged quasi-perpendicularly to the polar sheets. Structure analysis reveals a rare anti-anti conformation of the Co−OCO−Co fragments, which is thought to be responsible for the weak antiferromagnetism of the CoII chains. The exchange coupling constant between the magnetic centres has been estimated as J = −2.08 K.
Rueff et al. (Thu,) studied this question.