Structural homologies in benzylamino-N,N-bis methylphosphonic acid and its layered zirconium derivative |
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Authors: | Riccardo Vivani Ferdinando Costantino Giacomo D. Gatta |
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Affiliation: | a Dipartimento di Chimica, CEMIN, Centro di Eccellenza Materiali Innovativi Nanostrutturati, Università degli Studi di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy b Bayerisches Geoinstitut, Universität Bayreuth, Universität str. 30, D-95447 Bayreuth, Germany |
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Abstract: | A new layered zirconium diphosphonate fluoride, ZrF(O3PCH2)2NHCH2C6H5 has been prepared and its structure determined ab initio by X-ray powder data and refined with the Rietveld method (orthorhombic, , , , space group Pbca, , Z=8, Rwp=0.080). Both phosphonic groups of each diphosphonate building block are bonded to zirconium atoms on the same side of each layer. Benzyl groups from adjacent layers are interdigitated in the interlayer region, with probable π-π stacking interactions. The structure of the free benzylamino-N,N-bis methylphosphonic acid has been determined by single crystal X-ray data (monoclinic, space group P21, , , , β=92.930(3)°, , Z=2, R1=0.072, wR2=0.150). As in the zirconium derivative, benzyl groups from adjacent layers are interdigitated and create a regular alternation of polar and non-polar regions. |
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Keywords: | Ab initio structure solution X-ray powder diffraction Zirconium diphosphonates Layered compounds Functional solids |
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