Structural characterization of [Ln(TFA)3(HMPA)3] (Ln=La, Nd, Er) complexes

The X-ray data on La, Nd, Er complexes ([Ln(TFA) (HMPA) ]) show that they crystallize in different forms depending on the solvent 3 3 1 content. Er is six and seven coordinated in the two complex cations coexisting in the crystal cell: [Er(TFA) (HMPA) ] and 2 4 1 1 [Er(TFA) (HMPA) (H O) ] . The trifluoroacetate anions are monodentate in both coordination polyhedra. In the [Nd(TFA) (HMPA) ] 2 2 2 3 2 4 cations, Nd is eight coordinated with bidentate trifluoroacetate ligands. Ó 2001 Elsevier Science B.V. All rights reserved.