Abstract
Abstract Circular dichroism (CD) and proton magnetic resonance (PMR) spectra of nickel(II) complexes containing a series of ethylenediamine-N,N′-diacetic acid (H2edda)-type optically active quadridentate ligands were measured in aqueous solutions. The epro complex which is an edda-type optically active ligand containing l-proline residues is found to exhibit the same CD spectrum as complexes of other edda-type ligands containing l-alanine, l-valine, l-phenylalanine, and l-serine residues. The CD and PMR spectra of the mixed complexes of these edda-type ligands having an oxalate ion was also measured. From the CD and PMR spectral data, it is concluded that these complexes stereospecifically take the Δ-s-cis form in solution. The large contact shift observed for the a protons of the amino acidate moieties indicates that the substituent groups become axial to the chelate plane.
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