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Updated: Aug 19, 2026

Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
Published on: October 6, 2023
Two closely related lanthanum phosphonate frameworks formed by anion-directed linking of inorganic chains
John A Groves1, Paul A Wright, Philip Lightfoot
1School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST, UK.
Abstract:
Two novel three-dimensional lanthanum coordination polymers have been prepared with the phosphonic acid H2O3PCH2N(C2H4)2 NCH2PO3H2 (LH4). La2(LH2)2(LH4)Cl2 (I) and La2(LH2)2(LH3)Cl (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.
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