Nitroxides as Chelating Reagents

Many derivatives of imidazoline nitroxides proved to be capable of chelation without involvement of the radical center. Complexes with ions of transition metals were generated from carboxylic acids 107 and 108 

The interaction of 4-phenyl-3-imidazoline-l-oxyl (13c) with PdCl2 led to cyclometalation product 116, a dinitroxide with halo gen-bridging atoms (Ovcharenko et al, 1979). The reaction of 13c with mercury salts 

The use of imidazoline nitroxides as chelating agents is promising both for identifying the structure of complex compounds and for analytical purposes (see Section 5) since they allow the application of the ESR method 

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