The isotypic compounds Na 2 (H 2 O) 24 [M 2 (C 6 H 2 O 4 ) 3 ] (M = Mn 2+ , Cd 2+ ) form infinite net-like layers. The transition metal ion is coordinated octahedrally. The dianion of 2,5-dihydroxy-1.4- benzoquinone, consisting of two allyl systems interlinked by two long C-C distances (152-153 pm), acts as a chelating ligand. Adjacent layers are connected by hydrogen bonds. The stacking sequence of these layers, ···AAA···, leads to channels, which are filled by hydrated Na + ions. The Na + ions are coordinated in a distorted octahedral fashion, with neighbouring octahedra sharing common faces.
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Weiss et al. (1986) studied this question.
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