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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 [ Ln Cu 5 (GlyHA) 5 (SO 4 )(H 2 O) 6.5 ] 2 (SO 4 ), where  Ln III  = Pr, Nd, Sm, Eu, Gd, Dy and Ho.

Crystal structure of a TbIII–CuII glycinehydroxamate 15-metallacrown-5 sulfate complex

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