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Dipotassium tetrachromate(VI), K 2 Cr 4 O 13

2005; Wiley; Volume: 61; Issue: 12 Linguagem: Inglês

10.1107/s0108270105035833

1600-5759

Barbara M. Casari, Vratislav Langer,

Crystal Structures and Properties

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.