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

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