Synthesis and Crystal Structure of [o-C₂H₅C₆H₄NH₃]₄P₄O₁₂·2H₂O

A new cyclotetraphosphate of o-ethylphenylammonium dihydrate [o-C₂H ₅ C₆H₄NH₃]₄P₄O₁₂·2H₂O is reported. This compound is monoclinic P2₁/a with the following unit-cell parameters: a = 15.625(8), b = 8.479(3), c = 15.899(8) Åi, β = 111.46(4)°, V = 1960(2) ų, Z = 2, and D _x = 2.848 g·cm⁻³. The structure has been determined and refined to R = 0.049, using 2860 independent reflections. The structure is built up by centrosymmetric P ₄ O ₁₂ ⁴⁻ anions, water molecules, and (C₈H₁₂N)⁺ cations, which are held together into two-dimensional layers through (N,O)─ H … O hydrogen bonds. Chemical preparation, characterization by RX diffraction, IR absorption, and thermal analysis, are described.

Keywords:

• Crystal structure
• cyclotetraphosphate
• IR spectroscopy
• X-ray diffraction

Acknowledgments

Crystallographic data (CIF) for the structure reported in this article have been deposited with the Cambridge Crystallographic Data center as the supplementary publication No. 262399. Copies of the data can be obtained, free of charge, on application to the CCDC, 12 Union Road, Cambridge CB12EZ, UK. E-mail: [email protected]