Fe(TpivPP)(NO2)2]−: What is the nitrite orientation?

Abstract

We have prepared a new crystalline derivative of [Fe(TpivPP)(NO2)2][Formula: see text] with the [K(222)][Formula: see text] cation. The newly determined structure of the anion resolves an ambiguity about the relative orientation of the two axial nitrite ligands which were found in a previous structure determination with a different cation. The two NO[Formula: see text] ligands are found to have a relative perpendicular orientation with Fe[Formula: see text]–N(NO2) distances of 1.974 (6) Åand 1.994 (6) Å. The average Fe[Formula: see text]–N[Formula: see text] distance in the low-spin six-coordinate iron(III) porphyrinate derivative is 1.987 (3) Å.