Optical Resolution and Circular Dichroism Spectra of Mixed-diamine Palladium(II) Complexes with Configurational Chirality

Article abstract of DOI:10.1246/bcsj.54.1056

Six square-planar complexes, (ClO4)2 (meso-stien = meso-1,2-diphenyl-1,2-ethanediamine; L = N,N-diethylethylenediamine, N,N-dimethylethylenediamine, 2-methyl-1,2-propanediamine, N²,N²-dimethyl-2-methyl-1,2-propanediamine, N,N-dimethyl-1,3-propenediamine, and (2S)-N¹,N¹-diethyl-1,2-propanediamine), were prepared and optically resolved (or separated in the case of the last named ligand) using diacetyl-d-tartaric anhydride as the resolving agent.Their electronic absorption and CD spectra were measured.A definite additivity has been confirmed between the configurational CD caused by the chiral configuration and the vicinal CD due to the asymmetric carbon atom in the (2S)-N¹,N¹-diethyl-1,2-propanediamine complex.Absolute configurations of this and the other five complexes have been assigned by examining molecular models and the CD spectra.