Crystal structure of a Tb(III)–Cu(II) glycine­hydroxamate 15-metallacrown-5 sulfate complex

The core of the title complex, bis­[hexa­aqua­hemi­aqua­penta­kis­(μ(3)-glycine­hydroxamato)sulfato­penta­copper(II)terbium(III)] sulfate hexa­hydrate, [TbCu(5)(SO(4))(GlyHA)(5)(H(2)O)(6.5)](2)(SO(4))·6H(2)O (1), which belongs to the 15-metalla­crown-5 family, consists of five glycine­hydroxamate dianions (GlyHA(2−); C(2)H(4)N(2)O(2)) and five copper(II) ions linked together forming a metallamacrocyclic moiety. The terbium(III) ion is connected to the centre of the metallamacrocycle through five hydroxamate oxygen atoms. The coordination environment of the Tb(3+) ion is completed to an octa­coordination level by oxygen atoms of a bidentate sulfate and an apically coordinated water mol­ecule, while the copper(II) atoms are square-planar, penta- or hexa­coordinate due to the apical coordination of water mol­ecules. Continuous shape calculations indicate that the coordination polyhedron of the Tb(3+) ion in 1 is best described as square anti­prismatic. The positive charge of each pair of [TbCu(5)(GlyHA)(5)(H(2)O)(6.5)(SO(4))](2) (2+) fragments is compensated by a non-coordinated sulfate anion, which is located on an inversion center with 1:1 disordered oxygen atoms. Complex 1 is isomorphous with the previously reported compounds [LnCu(5)(GlyHA)(5)(SO(4))(H(2)O)(6.5)](2)(SO(4)), where Ln (III) = Pr, Nd, Sm, Eu, Gd, Dy and Ho.