title: KZn(HP(2)O(7)) x 2H(2)O and KMn(HP(2)O(7)) x -2H(2)O: acidpyrophosphate metallates(II) with layer structures.
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 Zn(2+)/Mn(2+) ions are octahedrally surrounded by four pyrophosphate O atoms and by two water molecules. The (HP(2)O(7))(3-) anions exhibit eclipsed conformations. The metal ions and water O atoms lie on mirror planes, as does the central O atom of the (HP(2)O(7))(3-) anion.
authors.affiliation: Laboratoire de Spectroscopie, Département de Chimie, Faculté des Sciences, Université Ibn Tofail, Kénitra, Morocco.
authors.forename: Hassane
authors.initials: H
authors.lastname: Assaaoudi
authors.forename: Abdelaziz
authors.initials: A
authors.lastname: Ennaciri
authors.forename: Mohamed
authors.initials: M
authors.lastname: Harcharras
authors.forename: Brahim
authors.initials: B
authors.lastname: El-Bali
authors.forename: Felix
authors.initials: F
authors.lastname: Reinauer
authors.forename: Robert
authors.initials: R
authors.lastname: Glaum
authors.forename: André
authors.initials: A
authors.lastname: Rulmont
authors.forename: Marie-Rose
authors.initials: MR
authors.lastname: Spirlet