The shortest distance between the two Er III centers located in the adjacent molecules (the intermolecular ErEr distance) is 13.438(1) Å. Figure presents the packing diagram of the Dy-dtepy-Dy-dtepy-Dy cores with the shortest intermolecular distances highlighted as a dotted line. Such a long through-space distance between the paramagnetic centers and even longer intramolecular separation through the dtepy ligands suggest that magnetic interactions can be completely neglected in the analysis of the magnetic properties of 1.