Field-Induced Single-Molecule Magnets Of Dysprosium Involving Quinone Derivatives

The coordination reaction of the [Dy(hfac)(3)(H2O)(2)] units (hfac(-) = 1,1,1,5,5,5-hexafluoroacetylacetonate) with the two quinone-based derivatives 4,7-di-tert-butyl-2-(3,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)benzo[d][1,3]dithiole-5,6-dione (L-1) and 7,8-dithiabicyclo[4.2.0]octa-1,5-diene-3,4-dione,2,5-bis(1,1-dimethylethyl) (L-2) led respectively to the complexes [Dy(hfac)(3)(H2O)(L-1)] (1) and [Dy(hfac)(3)(H2O) (L-2)]center dot(C6H14)(CH2Cl2) (2)center dot(C6H14)(CH2Cl2). X-ray structures on single crystal of 1 and 2 center dot(C6H14)(CH2Cl2) revealed the coordination of the Dy-III on the bischelating oxygenated quinone site and the formation of dimeric species through hydrogen bonds. Ac magnetic measurements highlighted field-induced single-molecule magnet behavior with magnetic relaxation through a Raman process.