INTERACTION OF IRON HALIDES WITH AROMATIC ISOCYANATES IN ORGANIC-SOLVENTS

The interaction of iron halides with aromatic isocyanates was studied using gel permeation chromatography and Mossbauer spectroscopy. In ace tone solution, iron(II) and (III) halides are shown to exist in the fo rm of both mononuclear and polynuclear compounds. In the reaction with aromatic isocyanates, halide ions (terminal and bridging) are substit uted by isocyanate groups. As a result, polynuclear complexes are form ed: 2FeBr2.TDI, 2FeBr2.3TDI, 4FeBr2.4TDI, 6FeBr2.2TDI, 4FeCl3.2TDI, 2F eCl3.TDI, and 2FeCl3.2TDI, where TDI is toluene-2,4-diisocyanate.