The transition metal squarates M(C 4 O 4 ) · 4 H 2 O (M 2+ = Mn 2+ , Fe 2+ , Co 2+ . Ni 2+ , and Zn 2+ ) are isotypic. They crystallize monoclinically, space group Ce-Cf, and consist of one-dimensional chain molecules [xxx] with the chain axes alternatively in direction [110] and [110]. The transition metal is octahedrally coordinated by two oxygen atoms of two C 4 O 4 2- -anions in rrarcs-position and 4 water molecules. Neighbouring chains are interlinked by hydrogen bonds. The distance between the planes of the parallel C 4 -rings of neighbouring chains is similar to the layer distance in graphite.
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Weiss et al. (1986) studied this question.