Synthesis and characterization of new strontium 4-carboxyphenylphosphonates |
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| Authors: | Vítězslav Zima Jan Svoboda Klára Melánová Ji?í Dybal |
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| Institution: | a Joint Laboratory of Solid State Chemistry of the Institute of Macromolecular Chemistry of Academy of Sciences, University of Pardubice, Studentská 84, 532 10 Pardubice, Czech Republic
b Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic |
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| Abstract: | Several new strontium 4-carboxyphenylphosphonates, i.e., two modifications of Sr(HOOCC6H4PO3H)2, SrH(OOCC6H4PO3)·H2O, Sr3(OOCC6H4PO3)2·4H2O and Sr3(OOCC6H4PO3)2·5.7H2O were prepared and characterized by elemental analysis, thermogravimetry, X-ray powder diffraction and infrared spectroscopy. It was found that the compositions of these compounds depend on the acidity of the reaction medium. In addition, the presented compounds are interconvertible in dependence on pH. The position of the acid hydrogen atom in SrH(OOCC6H4PO3)·H2O was determined from the IR spectra of the studied compounds.The structure of the β modification of Sr(HOOCC6H4PO3H)2 was solved from its X-ray powder diffraction pattern using an ab initio method (the FOX program) with subsequent Rietveld refinement in the FULLPROF program. The compound is monoclinic, with the space group P21/c (No. 14), a=49.88(2), b=7.867(2), c=5.602(3) Å, β=128.68(2)°, and Z=4. It has a one-dimensional structure with an inorganic part built of SrO8 distorted tetragonal antiprisms. |
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| Keywords: | Metal phosphonates Strontium Carboxyphenylphosphonic acid Inorganic-organic hybrid compounds Chain compounds Layered compounds |
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