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Synthesis and structure of a calcium polyphosphate with a unique criss-cross arrangement of helical phosphate chains

Jackson, Lauren E., Kariuki, Benson, Smith, Mark E., Barralet, Jake E. and Wright, Adrian J. 2005. Synthesis and structure of a calcium polyphosphate with a unique criss-cross arrangement of helical phosphate chains. Chemistry of Materials 17 (18) , pp. 4642-4646. 10.1021/cm050984x

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Abstract

We report here the facile synthesis and structural characterization of γ-Ca(PO3)2, a novel polymorph of calcium polyphosphate. The single-step synthesis of this potential biomaterial was achieved using flux methods at 250 °C, yielding a single-phase product stable at room temperature. Single-crystal X-ray diffraction determined the structure to be of monoclinic symmetry (a = 9.5669(2) Å, b = 9.5023(2) Å, c = 10.3717(3) Å, and β = 93.474(2)°, space group Cc), with layers of helical polyphosphate chains directed alternately along the [110] and [−110] unit cell directions to produce a unique arrangement of criss-cross polyphosphate layers separated by calcium ions. Further structural characterization by MAS-NMR and FT-IR was found to be consistent with this structure. Thermal studies indicated that γ-Ca(PO3)2 is stable up to 690 °C, whereupon it irreversibly converts to the β-Ca(PO3)2 polymorph.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: American Chemical Society
ISSN: 0897-4756
Last Modified: 04 Jun 2017 04:59
URI: http://orca-mwe.cf.ac.uk/id/eprint/47222

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