Two closely related lanthanum phosphate frameworks formed by anion-directed linking of inorganic chains

J A Groves, P A Wright, P Lightfoot

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)

Abstract

Two novel three-dimensional lanthanum coordination polymers have been prepared with the phosphonic acid H2O3PCH2N(C2H4)(2)NCH2PO3H2 (LH4). La-2(LH2)(2)(LH4)Cl-2 (I) and La-2(LH2)(2)(LH3)Cl-2 (II) arise from similar hydrothermal reactions but differing sources of La. A one-dimensional "lanthanum-phosphate" chain, comprising corner-linked LaO7 and PO3C polyhedra, forms the basis for the two different structures. The two structures differ in the mode of connectivity of the inorganic chains via the phosphonate groups. Both materials include extraframework chloride ions, the different amounts of which apparently direct the polytypic structures. In II, the chloride ions are incorporated in a noncentrosymmetric manner leading to a polar framework topology.

Original languageEnglish
Pages (from-to)1736-1739
Number of pages4
JournalInorganic Chemistry
Volume44
DOIs
Publication statusPublished - 21 Mar 2005

Keywords

  • CRYSTAL-STRUCTURES
  • DIPHOSPHONATE
  • TEMPLATE
  • DESIGN
  • PHASES

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