Abstract
The core of the title complex, bis-[hexa-aqua-hemi-aqua-penta-kis-(μ3-glycine-hydroxamato)sulfato-penta-copper(II)terbium(III)] sulfate hexa-hydrate, [TbCu5(SO4)(GlyHA)5(H2O)6.5]2(SO4)·6H2O (1), which belongs to the 15-metalla-crown-5 family, consists of five glycine-hydroxamate dianions (GlyHA2-; C2H4N2O2) 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 Tb3+ ion is completed to an octa-coordination level by oxygen atoms of a bidentate sulfate and an apically coordinated water mol-ecule, while the copper(II) atoms are square-planar, penta- or hexa-coordinate due to the apical coordination of water mol-ecules. Continuous shape calculations indicate that the coordination polyhedron of the Tb3+ ion in 1 is best described as square anti-prismatic. The positive charge of each pair of [TbCu5(GlyHA)5(H2O)6.5(SO4)]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 [LnCu5(GlyHA)5(SO4)(H2O)6.5]2(SO4), where Ln III = Pr, Nd, Sm, Eu, Gd, Dy and Ho.
Highlights
New examples of this class of metallamacrocyclic assemblies and studies of their structural features are of particular interest
We report the crystal structure of the new 15-metallacrown-5 complex [TbCu5(GlyHA)5(H2O)6.5(SO4)]2 (SO4)Á13(H2O) (1), which complements the previously reported series of isomorphous metallamacrocycles with Pr, Nd, Sm, Eu, Gd, Dy and Ho ions at their centres
Each unit cell in 1 contains two [TbCu5(GlyHA)5(SO4)(H2O)6.5]+ 15-metallacrown-5 cations related by an inversion center, one noncoordinated sulfate anion for charge-balance and non-coordinated water molecules (Figs. 1 and 2)
Summary
Numerous research studies devoted to polynuclear 3d–4f assemblies have been stimulated by their non-trivial luminescence properties (Jankolovits et al, 2011; Maity et al, 2015), single-molecule magnet (SMM) behaviour (Dhers et al, 2016; Zangana et al, 2014) and their significant magnetocaloric effect (Pavlishchuk & Pavlishchuk, 2020; Zheng et al, 2014). New examples of this class of metallamacrocyclic assemblies and studies of their structural features are of particular interest. We report the crystal structure of the new 15-metallacrown-5 complex [TbCu5(GlyHA)5(H2O)6.5(SO4)]2 (SO4)Á13(H2O) (1), which complements the previously reported series of isomorphous metallamacrocycles with Pr, Nd, Sm, Eu, Gd, Dy and Ho ions at their centres
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
