title: The triple pyrophosphate Cs3CaFe(P2O7)2.
abstract: The complex phosphate tricaesium calcium iron bis(diphosphate), Cs(3)CaFe(P(2)O(7))(2), has been prepared by the flux method. Isolated [FeO(5)] and [CaO(6)] polyhedra are linked by two types of P(2)O(7) groups into a three-dimensional framework. The latter is penetrated by hexagonal channels along the a axis where three Cs atoms are located. Calculations of caesium Voronoi-Dirichlet polyhedra give coordination schemes for the three Cs atoms as [8 + 3], [9 + 1] and [9 + 4]. The structure includes features of both two- and three-dimensional frameworks of caesium double pyrophosphates.
authors.affiliation: Department of Inorganic Chemistry, Taras Shevchenko National University, 64, Volodymyrska Street, 01033 Kyiv, Ukraine.
authors.forename: Nataliya Yu
authors.initials: NY
authors.lastname: Strutynska
authors.forename: Vyacheslav N
authors.initials: VN
authors.lastname: Baumer
authors.forename: Igor V
authors.initials: IV
authors.lastname: Zatovsky
authors.forename: Artem A
authors.initials: AA
authors.lastname: Babaryk
authors.forename: Nikolay S
authors.initials: NS
authors.lastname: Slobodyanik