title: Hydrated hexacyanometallate(III) salts of triaqua(18-crown-6)lanthanoid(III) and tetraaqua(18-crown-6)lanthanoid(III) cations containing nine- and ten-coordinate lanthanoids.
abstract: Tetraaqua(18-crown-6)cerium(III) hexacyanoferrate(III) dihydrate, [Ce(C(12)H(24)O(6))(H(2)O)(4)][Fe(CN)(6)].2H(2)O, and tetraaqua(18-crown-6)neodymium(III) hexacyanoferrate(III) dihydrate, [Nd(C(12)H(24)O(6))(H(2)O)(4)][Fe(CN)(6)].2H(2)O, are isomorphous and isostructural in the C2/c space group, where the cations, which contain ten-coordinate lanthanoid centres, lie across twofold rotation axes and the anions lie across inversion centres. In these compounds, an extensive series of O-H...O and O-H...N hydrogen bonds links the components into a continuous three-dimensional framework. Triaqua(18-crown-6)lanthanoid(III) hexacyanoferrate(III) dihydrate, [Ln(C(12)H(24)O(6))(H(2)O)(3)][Fe(CN)(6)].2H(2)O, where Ln = Sm, Eu, Gd or Tb, are all isomorphous and isostructural in the P\overline{1} space group, as are triaqua(18-crown-6)gadolinium(III) hexacyanochromate(III) dihydrate, [Gd(C(12)H(24)O(6))(H(2)O)(3)][Cr(CN)(6)].2H(2)O, and triaqua(18-crown-6)gadolinium(III) hexacyanocobaltate(III) dihydrate, [Gd(C(12)H(24)O(6))(H(2)O)(3)][Co(CN)(6)].2H(2)O. In these compounds, there are two independent anions, both lying across inversion centres, and the lanthanoid centres exhibit nine-coordination; in the crystal structures, an extensive series of hydrogen bonds links the components into a three-dimensional framework.
authors.affiliation: Department of Chemistry, University of Calcutta, 92 A. P. C. Ray Road, Kolkata 700009, India.
authors.forename: Phalguni
authors.initials: P
authors.lastname: Misra
authors.forename: Rajesh
authors.initials: R
authors.lastname: Koner
authors.forename: Malabika
authors.initials: M
authors.lastname: Nayak
authors.forename: Sasankasekhar
authors.initials: S
authors.lastname: Mohanta
authors.forename: John N
authors.initials: JN
authors.lastname: Low
authors.forename: George
authors.initials: G
authors.lastname: Ferguson
authors.forename: Christopher
authors.initials: C
authors.lastname: Glidewell