Author(s)

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.

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.

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

I. Dhouib, S. Al-Juaid, T. Mhiri and Z. Elaoud, "Crystal Structure, Thermal Behaviour and Vibrational Spectra of Tetraethylammonium Dihydrogenmonophosphate Bis Phosphoric Acid," Crystal Structure Theory and Applications, Vol. 2 No. 1, 2013, pp. 8-15. doi: 10.4236/csta.2013.21002.