Field-Induced Dysprosium Single-Molecule Magnet Involving A Fused O-Semiquinone-Extended-Tetrathiafulvalene-O-Semiquinone Bridging Triad

The reaction between the 2,2-benzene-1,4-diylbis(6-hydroxy-4,7-di-tert-butyl-1,3-benzodithiol-2-ylium-5-olate biradical triad (L) and the metallo-precursor [Dy(hfac)(3)]2H(2)O leads to the formation of a one-dimensional coordination polymer with the formula {[Dy(hfac)(3)(L)]2C(6)H(14)}(n) (1). The X-ray structure reveals that the polymeric structure is formed by the bridging of the Dy(hfac)(3) units with the multi-redox triad L. Single-crystal X-ray diffraction and UltraViolet-visible absorption spectroscopy confirm that the triad L in 1 is bound as a direduced, diprotonated form of o-quinone-extended tetrathiafulvalene-o-quinone (Q-exTTF-Q). Alternate Current (AC) measurements highlight a field-induced single-molecule magnet (SMM) behavior with an energy barrier of 20 K, and thus 1 can be described as a one-dimensional assembly of mononuclear SMMs bridged by the L triad.