Crystal structure of anhydrous nitrates and their complexes. Part VII. 1.5 Dinitrogen tetroxide solvate of iron(III) nitrate

Abstract

Crystal structure determination has shown that this solvate exists in the form [NO]⁺₃[NO₃]^–[Fe(NO₃)₄]^–₂ in which there is close association between the three [NO]⁺ and the [NO₃]^– ions to form a grouping [N₄O₆]²⁺. The nitrogen atom of each [NO]⁺ lies approximately along the bisector of each O–N–O angle of the nitrate ion with ON⁺⋯ O₂NO₂ distances ranging from ca. 2.4 to 2.8 Å and the NO⁺ axes tilted at angles ranging 10–51° out of the plane of the nitrate ion. The two crystallographically independent tetranitratoferrate(III) ions have the same trigonal dodecahedral structure as found in the tetraphenylarsonium salt with symmetrically bidentate nitrato-groups.