Abstract
The hydrothermal and ceramic syntheses, single crystal structures and some properties of MnTe6O13, NiTe6O13 and CoTe6O13 are described. These isostructural phases [space group R (No. 148) with a ≈ 10.2 A and c ≈ 19 A] contain a dense network of isolated MO6 (M = Mn, Ni, Co) octahedra, TeO4 folded squares and distorted TeO4+1 square-based pyramids, sharing vertices and edges by way of M–O–Te and Te–O–Te bonds. The TeIV lone pairs are directed into closed cavities formed from 18 Te-centred and 6 MO6 groupings. Magnetic susceptibility data for MnTe6O13 and CoTe6O13 show antiferromagnetic ordering at ca. 13 and 21 K, respectively, which must occur via a superexchange pathway.
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