Acta Crystallographica Section C

Crystal Structure Communications

Volume 58, Part 6 (June 2002)

Acta Cryst. (2002). C58, i79-i81    [doi:10.1107/S0108270102007394]

KZn(HP₂O₇)·2H₂O and KMn(HP₂O₇)·2H₂O: acid pyrophosphate metallates(II) with layer structures

H. Assaaoudi, A. Ennaciri, M. Harcharras, B. El Bali, F. Reinauer, R. Glaum, A. Rulmont and M.-R. Spirlet

Abstract: The crystal structures of the isomorphous title compounds, namely potassium zinc hydrogen pyrophosphate dihydrate and potassium manganese hydrogen pyrophosphate dihydrate, consist of acidic pyrophosphate-metallate(II) layers joined by K⁺ ions and hydrogen-bridging bonds. The Zn²⁺/Mn²⁺ ions are octahedrally surrounded by four pyrophosphate O atoms and by two water molecules. The (HP₂O₇)^3- anions exhibit eclipsed conformations. The metal ions and water O atoms lie on mirror planes, as does the central O atom of the (HP₂O₇)^3- anion.

Formula: KZn(HP₂O₇)(H₂O)₂ and KMn(HP₂O₇)(H₂O)₂

Online 21 May 2002

	Structure factor file (CIF format) (36.3 kbytes) Contains datablock I
	Structure factor file (CIF format) (316.4 kbytes) Contains datablock II

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