Summary: | The influence of the solvent in the reaction of dysprosium(III) chloride hydrate with the <i>N</i><sub>3</sub><i>O</i><sub>2</sub> ligand H<sub>2</sub>L (2,6-bis(2-hydroxyphenyliminomethyl)pyridine) was studied To this end, the new mononuclear chloride complex [Dy(L)Cl(H<sub>2</sub>O)<sub>2</sub>] (<b>1</b>) was isolated in absolute ethanol as solvent, without any evidence of the hydrolysis of the ligand. This clearly contrasts with previous results, where a similar reaction in methanol proceeds with the partial hydrolysis of the Schiff base, and the formation of a new hemiacetal donor to yield [Dy(HL’)<sub>2</sub>)][Dy(L)(Cl<sub>2</sub>)] (H<sub>2</sub>L’ = (6-(2-hydroxyphenyliminomethyl)-2-methoxyhydroxymethyl)pyridine). The single crystal X-ray structure of the chloride complex <b>1</b> shows that the Dy<sup>III</sup> ion is octacoordinated in a highly distorted <i>N</i><sub>3</sub><i>O</i><sub>4</sub>Cl environment between triangular dodecahedral and biaugmented trigonal prisms. The full magnetic characterisation of <b>1</b> shows that it presents field-induced single ion magnet behaviour, with a thermal energy barrier <i>U</i><sub>eff</sub> of 113.5 K, which is the highest among dysprosium complexes derived from H<sub>2</sub>L.
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