Abstract
An angular overlap model analysis was performed on the electronic spectrum of [Cr( d-pen) 2] − and [Cr( d-pen)( l-pen)] − (H 2pen = penicillamine), in both of which penicillamine acts as a tridentate ligand. The d-penicillamine complex has the trans-S, cis-N, cis-O configuration, while the dl-penicillamine complex has the cis-S, cis-N, cis-O configuration. The carboxylate group is a strong π-donor and the deprotonated sulphydryl a moderate π-donor.
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