Crystals of the title compounds were grown from their hydrous melts or solutions. The crystal structure of iron(III) trinitrate hexahydrate {hexaaquairon(III) trinitrate, [Fe(H(2)O)(6)](NO(3))(3)} is built up from [Fe(H(2)O)(6)](2+) octahedra and nitrate anions connected via hydrogen bonds. In iron(III) trinitrate pentahydrate {pentaaquanitratoiron(III) dinitrate, [Fe(NO(3))(H(2)O)(5)](NO(3))(2)}, one water molecule in the coordination octahedron of the Fe(III) atom is substituted by an O atom of a nitrate group. Iron(III) trinitrate tetrahydrate {triaquadinitratoiron(III) nitrate monohydrate, [Fe(NO(3))(2)(H(2)O)(3)]NO(3)·H(2)O} 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.
New Iron(III) Nitrate Hydrates: Fe(NO 3 ) 3 ·xH 2 O with x = 4, 5, and 6. -Crystals of the title compounds are obtained from their hydrous melts or solutions in highly concentrated nitric acid. Fe(NO3)3·6H2O crystallizes in the cubic space group Ia3 with Z = 8. The crystal structure is built up from [Fe(H2O)6] 2+ octahedra and nitrate anions connected via hydrogen bonds. Fe(NO3)3·5H2O crystallizes in the triclinic space group P1 with Z = 2. One water molecule in the coordination octahedron of the Fe III atom is substituted by an O atom of a nitrate group. Fe(NO3)3·4H2O crystallizes in the monoclinic space group P21/n with Z = 4. This compound is 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. -(SCHMIDT*, H.; ASZTALOS, A.; BOK, F.; VOIGT, W.; Acta Crystallogr., Sect. C: Cryst. Struct. Commun. 68 (2012) 6, i29-i33, http://dx.
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