Five new tri-spin lanthanide–nitronyl nitroxide (LnIII=GdIII, TbIII, DyIII, HoIII, ErIII) complexes: Structures and magnetic properties

摘要: Five radical–Ln(III)–radical complexes, [Ln(hfac) 3 (NITPhOC 4 H 9 ) 2 ] (Ln = Gd ( 1 ), Tb Dy Ho Er 5 ); hfac = hexafluoroacetylacetonate; and NITPhOC  = 4′-butoxy-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) have been synthesized, structurally magnetically characterized. The X-ray crystal structure analysis reveals that the structures of five complexes are isomorphous in which central Ln(III) ions coordinated by six oxygen atoms from three hfac two nitronyl radicals. magnetic studies show Gd(III) complex, there ferromagnetic Gd(III)–Rad interactions antiferro-magnetic Rad–Rad molecules (with J Rad–Gd  = 0.19 cm −1 ,  = −1.91 cm ). And analogous complex [Tb(hfac) shows strong Tb(III)–Rad interactions.