CHLOROACETATO)BIS(1,L0PHENANTHROLINE)EUROPIUM(III) DICHLOROACETATE AND THE CORRESPONDING ERBIUM(III) COMPLEX

The title complexes, hloroacetato)bis(1,10-phenanthroline)europium(III ) dichloroacetate, [Eu(CH-Cl2CO2)(2)(C12H8N2)(2)(H2O)(2)]CHCl2CO2, and ichloroacetato)bis(1,10-phenanthroline)erbium(III) dichloroacetate, [ Er(CHCl2CO2)(2)(C12H8N2)(2)(H2O)(2)]CH-Cl2CO2, are isostructural. The central atom in each is eight-coordinate and the coordination polyhedr a are slightly distorted square antiprisms. The phenanthroline and dic hloroacetato ligands compete to coordinate to the lanthanide ions. The structures of the series of lanthanide complexes Ln = La to Yb fall i nto two types, changing structure between Sm and Eu.