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Structure of the calcium pyrophosphate monohydrate phase (Ca2P2O7·H2O): towards understanding the dehydration process in calcium pyrophosphate hydrates

Gras, Pierre and Ratel-Ramond, Nicolas and Teychené, Sébastien and Rey, Christian and Elkaim, Erik and Biscans, Béatrice and Sarda, Stéphanie and Combes, Christèle Structure of the calcium pyrophosphate monohydrate phase (Ca2P2O7·H2O): towards understanding the dehydration process in calcium pyrophosphate hydrates. (2014) Acta Crystallographica Section C: Structural Chemistry, vol. 70 (part 9). pp. 862-866. ISSN 2053-2296

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Official URL: http://dx.doi.org/10.1107/S2053229614017446

Abstract

Calcium pyrophosphate hydrate (CPP, Ca2P2O7·nH2O) and calcium orthophosphate compounds (including apatite, octa­calcium phosphate etc.) are among the most prevalent pathological calcifications in joints. Even though only two dihydrated forms of CPP (CPPD) have been detected in vivo (monoclinic and triclinic CPPD), investigations of other hydrated forms such as tetra­hydrated or amorphous CPP are relevant to a further understanding of the physicochemistry of those phases of biological inter­est. The synthesis of single crystals of calcium pyrophosphate monohydrate (CPPM; Ca2P2O7·H2O) by diffusion in silica gel at ambient temperature and the structural analysis of this phase are reported in this paper. Complementarily, data from synchrotron X-ray diffraction on a CPPM powder sample have been fitted to the crystal parameters. Finally, the relationship between the resolved structure for the CPPM phase and the structure of the tetra­hydrated calcium pyrophosphate [beta] phase (CPPT-[beta]) is discussed.

Item Type:Article
Additional Information:Thanks to the International Union of Crystallography. The definitive version is available at http://journals.iucr.org The original PDF of the article can be found at Acta Crystallographica Section C: Structural Chemistry website : http://journals.iucr.org/c/issues/2014/09/00/issconts.html
HAL Id:hal-01073729
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)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:10 Oct 2014 10:50

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