Complexes of Iron with Aromatic LigandsThe reaction of FeCl3· 6 H2O with several substituted o‐phenylene diamines forms complexes of the Fe(II)‐ion with o‐quinone diimines. Before the formation of these complexes there are a few of redox reactions between Fe(III)ions and the diamines. The Fe(III)/o‐quinone diimine‐complex is an intermediate which was characterized by means of spectroscopic methods. The two forms of 6‐oxy‐7‐nitrosobenzthiazoline produce only one 1:3 complex with Fe(II)ions. Also the N‐methyl‐6‐oxy‐7‐nitrosobenzthiazolium iodide forms a 1:3 complex. In the former complex the quinone‐oxim‐form is the ligand. The isolated complexes were characterized through elemental