Hydrothermal synthesis and crystal structure of a new inorganic/organic hybrid of scandium sulfate: (H 2en)Sc 2(SO 4) 4·(H 2O) 0.72

Abstract

The first organically templated layered structure of scandium sulfate, (H 2en)Sc 2(SO 4) 4·(H 2O) 0.72, (en=ethylenediamine) was synthesized by a hydrothermal method and characterized by single crystal X-ray diffraction. In the title compound, scandium ions are bridged by sulfate groups with a ratio of 1:2 into a 4 3 6 layer structure. These layers are parallel packed and separated from each other by ethylenediammonium dications and water molecules. The title compound crystallizes in the monoclinic space group P2/ c, with cell parameters a = 8.5966 ( 13 ) Å , b = 5.1068 ( 8 ) Å , c = 18.847 ( 3 ) Å , β = 91.210 ( 3 ) ° , V = 827.2 ( 2 ) Å 3 and Z = 2 . Refinement gave R 1[ I>2 σ( I)]=0.0354 and w R 2[ I>2 σ( I)]=0.0878. Thermogravimetric analysis indicates that this material is thermally stable to above 400 °C.