Synthesis and EPR Studies of Zinc and Copper Tris(2‐pyridylmethyl)amines (TPMA) Metal Complexes Containing TEMPO Functionalities

A new family of stable radical‐containing polytopic ligands based on tris(2‐pyridylmethyl)amines TPMA architecture and their corresponding metal complexes have been synthesized. These molecular systems offered the possibility to investigate how various spin carriers, such as the metal ion and the organic radical, influence their EPR properties mainly through the empirical ratio of peak heights d1/d. Moreover, it has been possible to analyze how different conformations of TEMPO radical units in the molecular skeleton affect the metallic system. Tris(2‐pyridylmethyl)amines have been used as scaffold for the study of metal organic‐radical interactions using EPR.