The Versatility of Ethylene Glycol to Tune the Dimensionality and Magnetic Properties in Dy III -Anilato-Based Single-Ion Magnets

We exploit the high versatility of the solvent ethylene glycol (eg = CH OH-CH OH) acting as a ligand with three different coordination modes: terminal (κ ), chelate (κ ), and bridge (1κ ,2κ ) to prepare a novel family of six different coordination polymers with Dy and three different anilato ligands (3,6-disubstituted-2,5-dihydroxy-1,4-benzoquinone dianion = C O X , with X = H, Cl, and Br). With the X = H derivative (dhbq ), we have prepared [Dy (dhbq) (eg) (μ-eg)]·4eg·2H O ( ), a 3D diamond-like network with a chelate and bridging eg molecules. With the X = Cl derivative (chloranilato), we have prepared [Dy (C O Cl ) (eg) ]·2eg·H O ( ) and [Dy (C O Cl ) (μ-eg)(H O) ]·2eg·7H O ( ). Compound has a 2D (6,3)-gon brick-wall lattice and contains a chelate and a terminal eg molecule. Compound has a 3D diamond-like topology as , although now the chelate eg has been replaced by two water molecules. Finally, with the X = Br derivative (bromanilato), we have obtained [Dy (C O Br ) (eg) (CH OH) ]·2eg·4CH OH ( ), [Dy (C O Br ) (eg) ]·4eg ( ), and [Dy (C O Br ) (eg) (H O)]·2eg·H O ( ). Compound has a 2D (6,3)-gon herringbone topology and contains a chelate eg and a MeOH molecule. Compounds and have a 2D (6,3)-gon brick-wall topology with a chelate and a terminal eg molecules (in and in one of the two independent Dy centers of ). The other Dy center in has a chelate eg and a water molecule. All the compounds show slow relaxation of the magnetization at low temperatures (in compounds , , and with no applied DC field). The magnetization of compounds - relaxes through Orbach and direct mechanisms when a DC field is applied and through an Orbach and/or quantum tunneling mechanism when no DC field is applied.