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Journal of Coordination Chemistry
Year: 2011  |  Volume: 64  |  Issue: 24  |  Page No.: 4334 - 4343

Four tri-spin lanthanide−nitronyl nitroxide (LnIII = GdIII, DyIII, ErIII, and HoIII) complexes: syntheses, structures, and magnetic properties

Xiao-Ling Wang    

Abstract: Four radical−Ln(III)−radical complexes, [Ln(hfac)3(NITPhSCH3)2] (Ln = Gd (1), Dy (2), Er (3), Ho (4); hfac = hexafluoroacetylacetonate; NITPhSCH3 = 4’-thiomethylphenyl-4,4,5,5tetramethyl-imidazoline-1-oxyl-3-oxide), have been synthesized, and structurally and magnetically characterized. The X-ray crystal structures show that the structures of the four complexes are similar, consisting of isolated molecules in which Ln(III) ions are coordinated by six oxygen atoms from three hfac and two oxygen atoms from nitronyl radicals. The temperature dependencies of magnetic susceptibilities for the four complexes show that in the Gd(III) complex, ferromagnetic interactions between Gd(III)−radical and antiferromagnetic interactions between the radicals coexist with J Rad−Gd = 1.09 cm−1, J Rad−Rad = −1.85 cm-1.

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