No abstract

The crystal structure of the title compound, [Cu(C2H4NO2)2(H2O)], reported by Freeman et al. [(1964). Acta Cryst. 17, 1463–1470], has been reinvestigated and its absolute configuration established by anomalous dispersion effects. The origin of chirality in the crystalline state of this compound is the formation of right‐handed helices from a CuII coordination network self‐resolved into a pure enantiomeric phase.

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The structure of dipotassium tetrachromium(VI) tridecaoxide, K2Cr4O13, has been determined from single-crystal X-ray data collected at 173 (2) K on a racemically twinned crystal with monoclinic Pc space-group symmetry. The structure is composed of discrete [Cr4O13]2- zigzag chains held together by the charge-balancing potassium ions. The conformations adopted by the tetrachromate anion in alkali metal salts and Cr8O21 are different and can be divided into three categories.

K5Na[Ce2(SO4)6] contains two CeIII ions, cross‐linked via two oxy­gen and four sulfate bridges, a unique configuration for cerium sulfates. Each cerium is (8 + 2)‐coordinated by O atoms of four sulfate groups by bidentate linkages.