Cover illustration: View down  of [H3N(CH2)2NH3]0.5[BePO4] showing the topological connectivity between the Be (small shaded circles) and P (large open circles) tetrahedral nodes, resulting in an infinite framework of four- and eight-rings. See Harrison [Acta Cryst. (2001), C57, 891-892].
A comparison between the Rietveld and single-crystal X-ray structures of trilithium antimony tetraoxide, Li3SbO4, shows that the first method can yield a poor description of the structure, while the second gives more accurate geometric parameters.
Precise X-ray structural determinations of Na3Co(NO2)6 at 293 and at 10 K have been performed. The CoN6 core is quite close to octahedral in stereochemistry. The accurate and extensive data sets collected should be suitable for charge–density analysis studies.
[H3N(CH2)2NH3]0.5[BePO4] is the first organically templated beryllophosphate to crystallize with an aluminosilicate zeolite topology. A three-dimensional network of BeO4 and PO4 tetrahedra corresponding to the gismondine (GIS) framework encapsulates disordered ethylenediammonium cations.
The low-temperature structure of the title dodecanuclear mixed-valence manganese carboxylate, [Mn12O12(CD3COO)16(H2O)4]·2CD3COOH·4H2O, is similar to the room-temperature structure, differing by a small change in the configuration of one of the coordinated acetate groups, related to additional hydrogen bonding.