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inorganic compounds
This work is a correction of our earlier structural study where the structure of K2SeO4Te(OH)6 (KSeTe) was published in the non-centrosymmetric space group Cc [Dammak et al. (1999). J. Solid State Chem. 145, 612-618]. The present X-ray structure determination, using remeasured intensities, shows that KSeTe is monoclinic in space group C2/c. In this structure, the Te atom lies on a centre of symmetry and the Se atom on a twofold axis.
organic compounds
The single-crystal neutron diffraction technique was used to determine the crystal structure of melamine, C3H6H6, at 14 K. The molecule is nearly planar. There are three crystallographically inequivalent amine groups with different geometries, the asymmetric unit being the complete molecule.
inorganic compounds
The title compound, dicaesium sulfate selenate-telluric acid adduct, Cs2(SO4)0.57(SeO4)0.43·Te(OH)6, is a solid solution in the series Cs2(SO4)·Te(OH)6/Cs2(SeO4)·Te(OH)6. It crystallizes in the same structure as the end member Cs2(SeO4)·Te(OH)6 in space group P21/c, whereas the corresponding sulfate adopts another structure type and crystallizes in space group R3. The structure contains planes of statistically distributed SO4/SeO4 tetrahedra alternating with planes of Te(OH)6 octahedra, and with Cs+ cations situated between the planes. Both Te atoms lie on centres of symmetry.
organic compounds
This single-crystal neutron diffraction study of (±)-camphoric anhydride [systematic name: (RS)-1,8,8-trimethyl-3-oxabicyclo[3.2.1]octane-2,4-dione], C10H14O3, at 110 K was undertaken to determine accurately the positions of the H atoms. The crystal packing of these molecules depends on intermolecular hydrogen bonding. The (+) and (−) molecules are held together by weak C—H
O interactions to form chains in the crystal structure.
O interactions to form chains in the crystal structure.
