Crystal structure of compounds [Ln(H2O)8]3+·4CCl3COO−·4H2O·2(4-bpy)·(4-bpyH)+(Ln(III) = Gd, Tb, Er, AND Tm)

Abstract

Novel compounds of Gd(III), Tb(III), Er(III), and Tm(III) with 4,4′-bipyridine (4-bpy) and trichloroacetates are prepared. The title compounds are isomorphic and isostructural in the solid state. All atoms in the studied compound lie in general positions of the Cc space group. The coordination polyhedra around central atoms can be described as bicapped trigonal prisms slightly disordered towards a square antiprism. All 4-bpy molecules are located in the outer coordination sphere together with four trichloroacetate anions and four water molecules. One of the nitrogen atoms of one 4-bpy is protonated due to stoichiometry.