Crystal Structure and Infrared Absorption Spectra of Magnesium(II) Hydrogen Selenite Tetrahydrate, Mg(HSeO3)2·4H2O

• Published in: Journal of solid state chemistry Vol. 122; no. 2; pp. 338 - 342
• Main Authors: Mička, Zdeněk, Němec, Ivan, Vojtı́šek, Pavel, Ondráček, Jan
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-03-1996
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1006/jssc.1996.0123

The X-ray structural analysis of Mg(HSeO3)2·4H2O has been carried out. The substance crystallizes in a monoclinic system in space groupI2/a.a= 10.9962(6),b= 7.5517(8),c= 11.6660(9) Å, β = 100.92(1)°,V= 951.2(1) Å3,Z= 4,R= 0.0244 for 1164 observed reflections. The magnesium atom is surrounded by a coordination octahedron of oxygen atoms from four hydrogen selenite anions and two water molecules. The neighboring octahedra are interconnected through two hydrogen selenite anions and form {Mg[Se(OH)O2]2(H2O)2}nchains connected by multiple hydrogen bonds. Study of the FTIR vibrational spectra of Mg(HSeO3)2·4H2O confirmed that the protons in the hydrogen bonds are localized close to one oxygen atom. Down to a temperature of 77 K, no phase transitions connected with a change in the proton ordering were found for the test compound using vibrational spectroscopy.