UNSPECIFIED (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. doi:10.1021/cm050984x ISSN 0897-4756.

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Abstract

We report here the facile synthesis and structural characterization of gamma-Ca(PO3)2, a novel polymorph of calcium polyphosphate. The single-step synthesis of this potential biomaterial was achieved using flux methods at 250 degrees 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) angstrom, b = 9.5023(2) angstrom, c = 10.3717(3) angstrom, and beta = 93.474(2)degrees, 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 gamma-Ca(PO3)(2) is stable up to 690 degrees C, whereupon it irreversibly converts to the P-Ca(PO3)(2) polymorph.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General)
Journal or Publication Title:	CHEMISTRY OF MATERIALS
Publisher:	AMER CHEMICAL SOC
ISSN:	0897-4756
Official Date:	6 September 2005
Dates:	Date Event 6 September 2005 UNSPECIFIED
Volume:	17
Number:	18
Number of Pages:	5
Page Range:	pp. 4642-4646
DOI:	10.1021/cm050984x
Publication Status:	Published

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