Vibrational study of hydrogen bonding and structural disorder in Na2H(SO4)2, K3H(SO4)2 and (NH4)3H(SO4)2 crystals |
| |
Authors: | M Damak M Kamoun A Daoud |
| |
Institution: | Ecole Nationale d'Ingénieurs, Sfax Tunisia Laboratoire de Spectrochimie Infrarouge et Raman, CNRS, 2 rue Henri Dunant, 94320 Thiais France |
| |
Abstract: | Infrared and Raman spectra on Na3H(SO4)2, K3 H(SO4)2 and (NH4)3 H(SO4)2 crystals have been investigated at 300 and 100 K in the 4000 to 30 cm?1 region. An assignment of bands in terms of OH group frequencies and more or less distorted tetrahedra of ammonium and sulphate ions is given. The crystallographic and spectroscopic symmetry and/or dissymetry of OHO hydrogen bonds linking sulphate ions into dimers is discussed using OH group frequencies and the splitting of the v1 (SO4) Raman bands as criteria. In the particular case of (NH4)3H(SO4)1 compound containing several solid phases it can be shown that the room temperature phase (II) is strongly disordered, principally because of an orientational disorder of ammonium ions, and that a progressive ordering takes place with temperature lowering. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|