Abstract
Abstract Nickel(II) and cobalt(III) chelates of the Schiff bases derived from salicylaldehyde and dipeptides such as glycylglycine, glycylalanine and alanylglycine have newly been prepared. The reactivity of methylene or methine groups in the dipeptide moieties of those Schiff base chelates has been investigated on the basis of their PMR spectra in D2O. It has been confirmed that the methylene or methine protons of the N-terminal amino acid residue are more easily activated than those of the C-terminal amino acid residue.
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