Structural and spectroscopic investigations of the EuIII–CDTA system

Two crystal structures of EuIII complexes with CDTA (trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetate), [C(NH2)3]3[Eu2(CDTA)2(H2O)2]ClO4 · 7H2O (I) and [C(NH2)3][Eu(CDTA)(H2O)] · 2.375H2O (II), are presented. Both structures are polymeric and the central metal ions are eight-coordinate. The first coordination sphere of each EuIII cation contains five carboxylate oxygen atoms, two nitrogen ones and a water molecule. For I, as well as for water solutions of the EuIII–CDTA complex at various pH values, the spectroscopic (UV–Vis) properties were investigated.

New polymeric structures together with spectroscopic properties of the Eu–CDTA system are presented.Figure optionsDownload as PowerPoint slide