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N,N′-Homopiperazinebis(methylenephosphonic Acid) and its Use in the Synthesis of the new Copper Phosphonate ­[Cu(HO3P–CH2–NC5H10N–CH2–PO3H)]

Authors

  • Lars-Hendrik Schilling,

    1. Institute für Anorganische Chemie, Christian-Albrechts-Universität, Max-Eyth-Straße 2, 24118 Kiel, Germany
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  • Norbert Stock

    Corresponding author
    1. Institute für Anorganische Chemie, Christian-Albrechts-Universität, Max-Eyth-Straße 2, 24118 Kiel, Germany
    • Institute für Anorganische Chemie, Christian-Albrechts-Universität, Max-Eyth-Straße 2, 24118 Kiel, Germany, Fax: +49-431-880-1775

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  • Dedicated to Professor Wolfgang Bensch on the Occasion of His 60th Birthday

  • Supporting Information for this article is available on the WWW under http://dx.doi.org/10.1002/zaac.201300311 or from the author.

Abstract

The new aminomethylphosphonic acid H2O3P–CH2–NC5H10N–CH2–PO3H2 (H4L2) was synthesized and characterized in detail. Its reaction with Cu(NO3)2·3H2O under hydrothermal conditions led to the formation of the copper phosphonate [Cu(H2L2)], which was structurally characterized by single-crystal X-ray diffraction [space group P21/n, a = 8.4754(17), b = 16.903(3), c = 9.0787(18) Å, β = 106.58(3)°, R1 = 0.0296, wR2 = 0.0728]. In the crystal structure each Cu2+-ion is chelated by one ligand molecule forming tetragonal planar CuO2N2 polyhedra. Coordination by an oxygen atom from an adjacent second ligand molecule leads to [Cu(H2L2)]2 dimers, which contain tetragonal pyramidal CuO3N2 polyhedra. These dimers are linked by hydrogen bonds to one-dimensional chains, which are further connected by van der Waals interactions. The compound was further characterized by powder X-ray diffraction (PXRD), elemental analysis, IR spectroscopy, Raman spectroscopy, and magnetic measurements.

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