INFRARED STUDY OF COMPLEXES BETWEEN IRON, SALICYLALDEHYDE BENZOYL HYDRAZONE AND 7 ANALOGOUS DERIVATIVES

An i.r. study of Fe complexes prepared from salicylaldehyde benzoyl hy drazone and seven similar chelating agents allowed the assignment of s ome iron-ligand bands. The amide I and Phi-O band shifts indicate that the ligand O atoms are directly linked to Fe. The analogy between Fe- II and Fe-III complexes in the mid-i.r. range and the chiefly identica l frequencies in the far-i.r. range provide evidence that oxidation of Fe-II has occurred. The bands directly involved in complexation are s hifted compared to the free hydrazones, and all are medium or weak.