Structural, vibrational and DSC investigations of the tetraethylammonium hydrogenselenate crystal

The X-ray structure of tetraethylammonium hydrogenselenate, [N(C2H5)(4)]HSe O4, was determined at room temperature. The crystal belongs to the P (1) ov er bar space group of triclinic system, Z = 2, a = 8.290(2), b = 9.073(2), c = 9.517(2) Angstrom, alpha = 76.75(3), beta = 74.31(3) and gamma = 63.92( 3)degrees. The hydrogenselenate anions are joined into cyclic dimers by two identical (equivalent by Ci) strong hydrogen bonds O(2)-H(02)... O(1(a)); the O(2)... O(1(a)) distance equals 2.611(5) Angstrom. Powder IR and Raman spectra are discussed with respect to the crystal structure. The DSC reveal s two phase transitions at 328 and 358 K. (C) 2000 Elsevier Science B.V. Al l rights reserved.