Abstract
Two copper diphosphonates were hydrothermally synthesized using ethylenediphosphonic and p-xylenediphosphonic acids, synthesized according the Arbuzov method. The structure of (CuII(H2O))2{O3P–CH2–CH2–PO3} already described from powder data, was solved from single crystal data. Its symmetry is monoclinic (space group P21/c (no. 14)) with lattice parameters a=8.0670(4) Å, b=7.5889(4) Å, c=7.3997(4) Å, β=116.281(2)°, V=406.18(4) Å3, Z=2. The structure of (CuII(H2O))2{O3P–CH2–(C6H4)–CH2–PO3} was solved by powder X-ray diffraction (space group P21/c (no. 14)) with lattice parameters a=10.812(1) Å, b=7.577(1) Å, c=7.412(1) Å, β=92.34(1)°, V=606.7(2) Å3, Z=2. Both structures are built up from identical inorganic layers covalently linked by the organic chains which act as pillars. The inorganic layers contain dimers of edge-sharing CuO4(H2O) square pyramids linked by the PO3C tetrahedra. Both compounds are antiferromagnetic at 4(1) K.
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