Electronic Spectra of Mixed Ligand Complexes of Copper(II) with Different Amino Acids

Abstract

Copper(II) complexes were synthesised using methionine as the
common ligand and proline and serine as secondary ligands. The
mixed ligand complexes are soluble in water. Their electronic
spectra was scanned in water. Both the complexes show one asymmetric
absorption band around 16,000 cm^-1 , which suggests that
these mixed complexes have distorted octahedral geometry. Since
single band is observed in the electronic spectra of both the newly
synthesised copper(II) complexes, trans-geometry is suggested. The
value of molar extinction coefficient does not alter by change in
concentration hence it is confIrmed that complexes do not undergo
association or dissociation in solution.