Abstract
Because of the multiplicity of possible equilibria in metal-peptide solutions, a new study using multifrequency EPR in combination with computer simulations and second-derivative displays was attempted. This approach permitted the determination with good precision of a set of spin Hamiltonian input parameters for the Cu-GlyHis and Cu-HisGly complexes. Two different arrangements in the first coordination sphere of copper were determined. In the case of the Cu-GlyHis complex, the simultaneous presence of the monomer and the bis complex and their relative percentages were established
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