Crystal Structure, Thermal Behaviour and Vibrational Spectra of Tetraethylammonium Dihydrogenmonophosphate Bis Phosphoric Acid

Ikram Dhouib, Salih Al-Juaid, Tahar Mhiri, Zakaria Elaoud

Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, KSA.
Laboratoire de l’Etat Solide, Département de Chimie, Faculté des Sciences de Sfax, Sfax, Tunisia.

DOI: 10.4236/csta.2013.21002                

Abstract

Single crystals of the tetraethylammonium dihydrogenmonophosphate bis trihydrogenmonophosphate [CH₃CH₂]₄N⁺(H₂PO₄)(H₃PO₄₎₂(TEP), were grown by slow evaporation solution technique at room temperature. The compound was characterised by IR, Raman, differential thermal analysis (TG-DTA) and single crystal X-ray diffraction. It crystallizes in the monoclinic system (space group P2₁/c) with the following unit cell dimensions: a = 7.765 (2) , b = 16.531 (4) , c = 14.843 (2) , β = 100.99 (2)^o, Z=4 , D_X =1.67Mg.m^-3, D_m=1.532Mg^-3, λ (MoKa) = 0.71073 , u=0.384 mm^-1, F(000)=991, T = 20 (2)^o. The structure was solved by the direct method and refined to final R value of 0.0342 and R_w=0.107 for 3239 independent [(CH₃CH₂)₄N]⁺ reflections. The structure consists of infinite parallel two-dimensional planes built of mutually , H₃PO₄ tetrahedra  and cations connected by strong and hydrogen bonding. There are no contacts other than van der Waals interactions between the layers.

Keywords

Organic Phosphate; Crystalline Structure; Vibrational Spectra; Thermal Behaviour; Differential Thermal Analysis

Conflicts of Interest

The authors declare no conflicts of interest.

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