Abstract
Glycylglycine substituted with 4-amino-2,2,6,6-tetramethyl piperidineN-oxide on the carboxylic acid function was used as a ligand to complex cupric ions. In aqueous solutions, blue species, of low stability, were obtained. E.p.r. spectroscopy showed the formation of various complexes. At basic pH values, a paramagnetic signal is observed with A∥ = 101 gauss and g∥ = 2.16. The spectroscopic parameters are interpreted in terms of strong magnetic exchange between the spin-labelled ligand and cupric ions.
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