Synthesis and Characterization of MIIN4-Macrocyclic Complexes of Iron and Cobalt and Their Electrochemical Studies

Due to the unique structural, electronic and electrochemical features, the macrocyclic complexes are recognized as potential models in diverse field of research like electrocatalysis, biological, pharmaceuticals etc. Herein, we prepared MIIN4-macrocyclic complexes (M = FeII and CoII) via condensation of 2,3-diaminopyridine and 2,6-pyridinedicarboxylic acid in presence of metal salts. These synthesized complexes were characterized using multiple spectroscopies. The octahedral geometry was assigned to the complexes on the basis of electronic spectral studies. Further, the electrochemical behavior of these complexes was evaluated using cyclic voltammetry, and the results agreed with the stability of uncommon oxidation states of the corresponding transition metal ion. These fundamental studies will help to concern community to design the efficient macrocyclic models for various applications.