title: Pseudo-merohedrally twinned praseodymium hexacyanoferrate(III) tetrahydrate.
abstract: Crystals of the title compound, diaquahexa-mu-cyano-ferrate(III)praseodymium(III) dihydrate, Pr[Fe(CN)(6)].4H(2)O or [PrFe(CN)(6)(H(2)O)(2)].2H(2)O, are twinned with three components. The Pr atom is coordinated by eight atoms, viz. six N and two symmetry-related water O atoms. The Pr polyhedron (Pr has site symmetry m2m, Wyckoff position 4c) is linked to an FeC(6) octahedron (Fe located on a site with imposed 2/m symmetry, Wyckoff position 4b) through N atoms, forming an infinite array. The second (symmetry independent) water molecule lies on a mirror plane, is not included in coordination and is weakly hydrogen bonded to N atoms.
authors.affiliation: Department of Environmental Inorganic Chemistry, Chalmers University of Technology, SE-41296 Göteborg, Sweden. langer@chem.chalmers.se
authors.forename: Vratislav
authors.initials: V
authors.lastname: Langer
authors.forename: Lubomír
authors.initials: L
authors.lastname: Smrcok
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Masuda