Acta Cryst. (2012). C68, i29-i33 [ doi:10.1107/S0108270112015855 ]
New iron(III) nitrate hydrates: Fe(NO3)3·xH2O with x = 4, 5 and 6
H. Schmidt, A. Asztalos, F. Bok and W. Voigt
Synopsis: The crystal structure of iron(III) trinitrate hexahydrate is built up from [Fe(H2O)6]2+ octahedra and nitrate anions connected via hydrogen bonds. In iron(III) trinitrate pentahydrate, one water molecule in the coordination octahedron of the FeIII atom is substituted by an O atom of a nitrate group. Iron(III) trinitrate tetrahydrate represents the first example of a simple iron(III) nitrate with pentagonal-bipyramidal coordination geometry, where two bidentate nitrate anions and one water molecule form a pentagonal plane.
Formula: [Fe(H2O)6](NO3)3, [Fe(NO3)(H2O)5](NO3)2 and [Fe(NO3)2(H2O)3]NO3·H2O
Online 12 May 2012