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Advances in the synthesis and structure of α-canaphite: a multitool and multiscale study

Mayen, Laëtitia and Jensen, Nicholai D. and Desbord, Maximilien and Laurencin, Danielle and Gervais, Christel and Bonhomme, Christian and Smith, Mark E. and Porcher, Florence and Elkaim, Erik and Charvillat, Cédric and Gras, Pierre and Rey, Christian and Soulié, Jérémy and Combes, Christèle Advances in the synthesis and structure of α-canaphite: a multitool and multiscale study. (2020) CrystEngComm, 22 (18). 3130-3143. ISSN 1466-8033

(Document in English)

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Official URL: https://doi.org/10.1039/d0ce00132e


α-Canaphite (CaNa2P2O7·4H2O) is a layered calcium disodium pyrophosphate tetrahydrate phase of significant geological and potential biological interest. This study overcomes the lack of a reliable protocol to synthesize pure α-canaphite by using a novel simple and reproducible approach of double decomposition in solution at room temperature. The pure α-canaphite is then characterized from the atomic to the macroscopic level using a multitool and multiscale advanced characterization strategy, providing for the first time full resolution of the α-canaphite monoclinic structure, including the hydrogen bonding network. Synchrotron X-ray diffraction and neutron diffraction are combined with multinuclear solid state NMR experimental data and computational modeling via DFT/GIPAW calculations. Among the main characteristics of the α-canaphite structure are some strong hydrogen bonds and one of the four water molecules showing a different coordination scheme. This peculiar water molecule could be the last to leave the collapsed structure on heating, leading eventually to anhydrous α-CaNa2P2O7 and could also be involved in the internal hydrolysis of pyrophosphate ions as it is the closest water molecule to the pyrophosphate ions. Relating such detailed structural data on α-canaphite to its physico-chemical properties is of major interest considering the possible roles of canaphite for biomedical applications. The vibrational spectra of α-canaphite (deuterated or not) are analyzed and Raman spectroscopy appears to be a promising tool for the identification/diagnosis of such microcrystals in vitro, in vivo or ex vivo.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Collège de France (FRANCE)
Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Synchrotron SOLEIL - SSOLEIL (FRANCE)
Other partners > Sorbonne Université (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > University of Warwick (UNITED KINGDOM)
Other partners > Lancaster University (UNITED KINGDOM)
Other partners > University of Southampton (UNITED KINGDOM)
Other partners > Université de Montpellier (FRANCE)
Laboratory name:
Deposited On:31 Mar 2021 14:15

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