Crystal structure, thermal behavior and vibrational studies of tetraethylammonium dihydrogenarsenate bis‐arsenic acid [(C2H5)4N].[H2AsO4].[H3AsO4]2

Ikram Dhouib (1) , Philippe Guionneau (2) , Tahar Mhiri (1) , Zakaria Elaoud (1)

1 Laboratoire de l'État Solide
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

An organic‐inorganic hybrid compound of tetraethylammonium dihydrogenarsenate bisarsenic acid salts of formula [(CH3CH2)4N].[H2AsO4].[H3AsO4]2 (TEAs) were grown by the slow evaporation and characterized by means of single crystal X‐ray diffraction, thermal analysis, FT‐IR and Raman spectroscopy. This compound crystallize in the space groups Cc with unit cell parameters, a = 20.105(2) Å; b = 7.342(4) Å, c = 15.292(2) Å, γ = 115(4)°, Z = 4, R = 0.07. The structure has solved using direct methods and refined by least‐squares analysis. In this case, the structure consists of infinite parallel two‐dimensional planes built of mutually H2AsO4−, H3AsO4 tetrahedra connected by strong O‐H***O hydrogen bonding. The thermoanalytical properties were studied using TG of TEAs method in the temperature ranges from 300 to 440 K for this hygroscopic sample. DSC measurement was carried out in the temperature range from 305 to 425 K.

Mots clés: Arsenic acid; Crystal structure; Organic compounds; Raman spectroscopy; Infrared spectroscopy; Differential scanning calorimetry

Domaines: Matériaux

Ikram Dhouib, Philippe Guionneau, Tahar Mhiri, Zakaria Elaoud. Crystal structure, thermal behavior and vibrational studies of tetraethylammonium dihydrogenarsenate bis‐arsenic acid [(C2H5)4N].[H2AsO4].[H3AsO4]2. European Journal of Chemistry, 2014, 5 (3), pp.388-393. ⟨10.5155/eurjchem.5.3.388-393.1038⟩. ⟨hal-00986960⟩