European Journal of Chemistry 2018, 9(3), 258-268. doi:10.5155/eurjchem.9.3.258-268.1762

Synthesis, crystal structures, substitutional and comparative structural analysis of copper diphosphates LiNaCuP2O7, LiKCuP2O7 and Rb0.5Na1.5CuP2O7


Ines Fitouri (1) orcid , Habib Boughzala (2,*) orcid

(1) Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Manar II Tunis, Tunisia
(2) Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Manar II Tunis, Tunisia
(*) Corresponding Author

Received: 11 Jun 2018, Accepted: 28 Jul 2018, Published: 30 Sep 2018

Abstract


The title compounds are members of the M2O-CuO-P2O5 system (M = Li, Na, K and Rb), where the lithium, sodium, potassium, rubidium and cesium phases have already been structurally characterized. The studied diphosphates LiNaCuP2O7, LiKCuP2O7 and Rb0.5Na1.5CuP2O7 belong to a large family of materials of general formula, MM’CuP2O7 (M, M’ = Monovalent cation) where the elements M and M’ ionic radii are decisive in the structural type determination. They were synthesized by solid-state reactions. The X-ray structural analysis show that these compounds crystallize in the P21/n monoclinic lattice where the CuO5 pyramidal square are linked to nearly eclipsed P2O7 groups by corner sharing to build up corrugated layers [CuP2O7]2- extending perpendicularly to [010]. The Li+, Na+, K+ and Rb+ cations reside in the interlayer space and in cavities delimited by the anionic network. In this study, the synthesis, the structure, the powder diffraction, the infrared spectroscopy, the thermal analysis (DTA/TGA) and a structural comparison are presented. The structural models were validated by Bond Valence-Sum (BVS) and charge distribution (CHARDI) analysis.


Keywords


Copper; Powders; Phosphorus; X-ray diffraction; IR spectroscopy; Single crystal X-ray structure

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DOI: 10.5155/eurjchem.9.3.258-268.1762

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How to cite


Fitouri, I.; Boughzala, H. Eur. J. Chem. 2018, 9(3), 258-268. doi:10.5155/eurjchem.9.3.258-268.1762
Fitouri, I.; Boughzala, H. Synthesis, crystal structures, substitutional and comparative structural analysis of copper diphosphates LiNaCuP2O7, LiKCuP2O7 and Rb0.5Na1.5CuP2O7. Eur. J. Chem. 2018, 9(3), 258-268. doi:10.5155/eurjchem.9.3.258-268.1762
Fitouri, I., & Boughzala, H. (2018). Synthesis, crystal structures, substitutional and comparative structural analysis of copper diphosphates LiNaCuP2O7, LiKCuP2O7 and Rb0.5Na1.5CuP2O7. European Journal of Chemistry, 9(3), 258-268. doi:10.5155/eurjchem.9.3.258-268.1762
Fitouri, Ines, & Habib Boughzala. "Synthesis, crystal structures, substitutional and comparative structural analysis of copper diphosphates LiNaCuP2O7, LiKCuP2O7 and Rb0.5Na1.5CuP2O7." European Journal of Chemistry [Online], 9.3 (2018): 258-268. Web. 21 Oct. 2019
Fitouri, Ines, AND Boughzala, Habib. "Synthesis, crystal structures, substitutional and comparative structural analysis of copper diphosphates LiNaCuP2O7, LiKCuP2O7 and Rb0.5Na1.5CuP2O7" European Journal of Chemistry [Online], Volume 9 Number 3 (30 September 2018)

DOI Link: https://doi.org/10.5155/eurjchem.9.3.258-268.1762

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