title: KHCoP2O7.2H2O: a novel acidic pyrophosphate.
abstract: Potassium cobalt hydrogenpyrophosphate dihydrate, KHCoP(2)O(7).2H(2)O, crystallizes in the orthorhombic space group Pnma. This salt is isotypic with KHMP(2)O(7).2H(2)O (M = Mn and Zn). The structure consists of alternating layers, built from HP(2)O(7)(3-) acidic pyrophosphate groups and CoO(6) octahedra, joined by potassium ions and bridging hydrogen bonds. The Co, K and water O atoms lie on mirror planes. The pyrophosphate group consists of two symmetry-related PO(4) groups, with the bridging O atom on a mirror plane.
authors.affiliation: Laboratory of Spectroscopy, Department of Chemistry, Faculty of Sciences, University Ibn Tofail, BP 133, 14000 Kenitra, Morocco.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Harcharras
authors.forename: Kees
authors.initials: K
authors.lastname: Goubitz
authors.forename: Abdelaziz
authors.initials: A
authors.lastname: Ennaciri
authors.forename: Hassane
authors.initials: H
authors.lastname: Assaaoudi
authors.forename: Henk
authors.initials: H
authors.lastname: Schenk