A New Organic-Cation Cyclotetraphosphate C₁₀H₂₈N₄P₄O₁₂·4H₂O: Crystal Structure, Thermal Analysis, and Vibrational Spectra

Author： Soumhi E.H. Saadoune I. Driss A.

Publisher： Academic Press

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.156, Iss.2, 2001-02, pp. : 364-369

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Abstract

A new organic-cation phosphate of C₁₀H₂₈N₄P₄O₁₂·4H₂O has been obtained. The crystal structure determination shows that this compound crystallizes in the triclinic system, space group P-1, with the following unit cell parameters: a=9.147(3) Å; b=9.258(3) Å; c=8.974(3) Å; α=79.92(3)°; β=117.41(3)°; γ=116.58(3)°. P₄O₁₂ cycles, which present the strongest distortion in this kind of materials, are connected through O_W–H—O–P hydrogen bonds, so that bidimensional layers parallel to the ab plane are formed. These layers are themselves interconnected by means N–H—O–P hydrogen bonds originating from the (C₁₀H₂₈N₄)⁴⁺ cations forming a three-dimensional network. The hydrated character of this phosphate is confirmed by the coupled TG-DTA thermal study which shows the successive loss of water molecules. The molecular arrangement within the structure has been confirmed by the IR spectroscopy.