Abstract
Several X-ray determined structures are described of ditopic clusters based on the Mn(m)Ca(n) motif where m = 2, n = 2; m = 6, n = 2. A cuboid arrangement of Ca2Mn2O6 is observed in three structures and they vary slightly in terms of Mn–O and Ca–O bond lengths. A “wheel and axle” like motif is observed in the final structure in which a calcium thread resides inside a Mn6 ring. Crystal packing features are also described for the cuboid structures and subtle structural changes are discussed in the framework of supramolecular chemistry and crystal engineering.
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