Non-covalent intramolecular Dy···F interactions in tris(pentafluorophenyl)methanolate dysprosium(III) complexes

The reactions of (C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>COH with (<em>o </em>-Me<sub>2</sub>NC<sub>6</sub>H<sub>4</sub>CH<sub>2</sub>)<sub>3</sub>Dy affords two new Dy<sup>3+</sup> tris(alkoxy) complexes isolated in the form of pyridine and NMe<sub>3</sub> adducts [(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>CO]<sub>3</sub>Dy(L)<em><sub>n</sub></em> (L = py, <em>n</em> = 2 and L = Me<sub>3</sub>N, <em>n</em> = 1). The first complexes adopts trigonal bipyramidal geometry while the second one is and almost ideal trigonal pyramidal. A characteristic feature of the latter formally four-coordinate complex is the presence of non-covalent intramolecular Dy⋯F interactions with each of (C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>CO<sup>-</sup> ligands reflected in short contacts, while in the former five-coordinate complex, such interactions were not detected.