Spectrum-structure correlation for visible absorption spectra of copper(II) complexes showing axial co-ordination in aqueous solution

摘要

We attempted to draw some general considerations regarding the ability of the visible absorption spectra to provide information on axial co-ordination around copper(11) ion in aqueous solution. A series of visible spectra was recorded on the copper(Il)-2,2'-bipyridine and copper(II)-L-aspartic acid systems. 2,2'-Bipyridine is known for its ability to co-ordinate copper(II) in axial position(s) as well, while L-aspartic acid is a potential tridentate ligand whose ability to chelate in axial position has been here investigated.